[User]
I need help creating a customizable webcam mount for a monitor, specifically designed to work with the e-Power webcam but adaptable for other displays and webcams.

I have a current design in OpenSCAD, but it's not as robust as I'd like, and I think a more parametric approach would be beneficial. My current design is essentially a clip that fits over the top of the monitor and extends out to hold the webcam.

Here are the key dimensions I'm currently using, which should become parameters in the new design:

*   `displayThickness`: The thickness of the monitor screen. In my current case, it's 43mm.
*   `displayTop`: The height of the top lip of the monitor. Currently, this is 7mm.
*   `webcamBaseMax`: The maximum width of the webcam's base. This is 25mm.
*  `webcamBaseMin`: The minimum width of the webcam's base. This is 21mm
*   `webcamThickness`: The thickness of the webcam base. Currently, this is 3.8mm.
*   `height`: The height of the 'arm' that extends from the monitor to the webcam. This is 14mm.

The existing code uses a simple `hull()` operation to create the basic shape of the mount and a few cubes and a cylinder for the other elements.

I want the new design to be fully parametric, so I can easily modify it for different monitor thicknesses, top lip heights, webcam base sizes, and arm heights. It would be great to include parameters to control the thickness of the mount itself, both the part that goes over the monitor and the arm. I’d prefer the mount to be made up of rectangular segments if possible and would also like an optional countersunk screw hole for extra security when it's being clamped onto the monitor, which can be disabled when a screw is not needed.

I'm also thinking about incorporating a way to adjust the webcam's vertical position along the arm. Maybe using some kind of slot instead of a fixed position would be useful. Let's make this an optional feature. If it is enabled, the vertical position parameter can be added.

Ideally the design would use the MCAD library for screw holes.

[Assistant]
e-Power_webcam_mount_for_SAMPO_PD-80A31Q_display.scad:
```

displayThickness = 43;
displayTop = 7;
webcamBaseMax = 25;
webcamBaseMin = 21;
webcamThickness = 3.8;

height=14;

cube([displayTop+2, 2, webcamBaseMax]);
hull() {
    translate([displayTop,0,0]) {
        cube([2, displayThickness+2+2, webcamBaseMax]);
    }
    translate([displayTop+height,(displayThickness+2)/2-2,0]) {
        cube([2, 4, webcamBaseMax]);
    }
}
translate([0,displayThickness+2,0]) {
    cube([displayTop+2, 2, webcamBaseMax]);
}
translate([displayTop+height+1,(displayThickness+2)/2-1,(webcamBaseMax-webcamBaseMin)/2]) {
    cube([webcamThickness+2,2,webcamBaseMin]);
}

translate([displayTop+webcamThickness+height+4,(displayThickness+2)/2,0]) {
    cylinder(r=2, h=webcamBaseMax, $fn=100);
}

```


[User]
Hey, I'm looking to generate a parametric knob design for 3D printing. It needs to accommodate standard metric hex-head screws, specifically sizes from M1 to M64. The design should allow for adjustment of the overall knob size and shape.

Here are some specific parameters I'd like to control:

*   **Screw Head:**
    *   `headIso`: The metric size of the screw head (M1, M2, M3... M64). This will determine the size of the hexagonal cutout for the head. You'll need a lookup table for standard sizes.
    *   `headHeight`: The height of the screw head (how deep the recess for the head needs to be).
    *   `screwHeadSafetyHeight`: The height of a small conical section between the screw hole and the hex cutout, which will improve printability, especially when printing upside down.

*   **Knob Body:**
    *   `maxRadius`: The maximum radius of the knob.
    *   `minRadius`: The minimum radius of the knob, defining the base of the grip section.
    *   `maxRadiusChamfer`: The radius of the chamfer at the top of the knob.
    *   `maxHeight`: The total height of the knob.
    *   `holderHeight`: The height of the thicker cylindrical base that contains the hex cutout for the screw.
    *   `holderChamfer`: The height of the larger chamfer at the bottom of the knob.
    *   `numberOfCuts`: The number of radial cuts (or grip features) around the circumference of the knob.
    *   `cutRadius`: The radius of the cylinder used for the radial cuts.
    *    `cutOffset`: The offset of the cutting cylinders' center from the main knob's radius.

*   **General:**
    *   `tolerance`: A small value to create clearance between parts for printing.
    *   `$fn`: For curvature smoothing (high value for smooth curves).

I'm envisioning the main knob body being a combination of cylinders and chamfers. The screw head cutout will need to be a hexagonal prism (or a series of them to make a hull). The radial cuts are generated by subtracting offset cylinders.

Can you generate a parametric OpenSCAD file (or files) to accomplish this? I think I need some of the code from the "hex head" code and lookups from http://www.thingiverse.com/thing:269863.

[Assistant]
MetricScrewKnob.scad:
```
// <Sopak's Metric Screw Knob> (c) by <Kamil Sopko>
//
// <Sopak's Metric Screw Knob> is licensed under a
// Creative Commons Attribution-ShareAlike 4.0 Unported License.
//
// You should have received a copy of the license along with this
// work.  If not, see <http://creativecommons.org/licenses/by-sa/4.0/>.

// it incorporate some methods from http://www.thingiverse.com/thing:269863

/* [ScrewDimensions] */

// type odf screw head 6 sides iso nut  M1...M8..M10
headIso=8;// [1:21]

//height of screw head, use bigger size, as it is  printed  from bottom and   can collapse littlebit
headHeight=7.5;  // [0:0.1:50]

/* [KnobDimensions] */

//maximum radius  of knob
maxRadius=25; // [10:100]

//minimum radius  of knob
minRadius=12; // [5:100]

//maximum radius chamfer
maxRadiusChamfer=1.3; // [0.1:0.1:10]

//max height of whole knob
maxHeight=40;  // [5:100]

//height of  holder include chamfers
holderHeight=10;    // [5:100]

// number of  side cuts   in knob
numberOfCuts=5; // [0:30]

//radius  of cut
cutRadius=12; // [10:50]

//maxRadius+cutOffset is center of cutting  cylinder should be  smaller then cutRadius
cutOffset=8;  // [1:50]

//big chamfer height
holderChamfer=10;  // [0:50]

//this is height of  conus  between  6side head and  screw hole, this is here for printability as its  from botom to top
screwHeadSafetyHeight=6;  // [0:10]

/* [OtherValues] */

//just  for cleaner boolean  operations
tolerance=0.3;

//quality
$fn=100;

module knob(numberOfCuts=7,maxRadius=25,minRadius=10,maxRadiusChamfer=1.5,
    maxHeight=20,holderHeight=10,cutRadius=12,cutOffset=8,holderChamfer=5,headIso=8, headHeight=7,screwHeadSafetyHeight=5,tolerance=0.3){

    rotate([0,0,0])difference(){
        //main body
        union(){
            translate([0,0,0]){
                cylinder(r2=maxRadius,r1=maxRadius-maxRadiusChamfer,h=maxRadiusChamfer*2);
                translate([0,0,maxRadiusChamfer*2]){
                    cylinder(r1=maxRadius,r2=maxRadius,h=holderHeight-4*maxRadiusChamfer);
                    translate([0,0,holderHeight-4*maxRadiusChamfer]){
                        hull(){
                            cylinder(r2=maxRadius-maxRadiusChamfer,r1=maxRadius,h=maxRadiusChamfer*2);
                            translate([0,0,maxRadiusChamfer+holderChamfer-tolerance])cylinder(r=minRadius,h=tolerance);
                        }
                    }
                }
            }
            cylinder(r=minRadius,h=maxHeight);
        }

        //cut for screw rod
        translate([0,0,-tolerance])cylinder(d=headIso+2*tolerance,h=maxHeight+2*tolerance);

        //remove for screw head
        hull(){
            translate([0,0,-tolerance-headHeight])hex_head(2*headHeight+2*tolerance, get_iso_waf(headIso) + tolerance);
            translate([0,0,headHeight-tolerance+screwHeadSafetyHeight])cylinder(d=headIso+2*tolerance,h=tolerance);
        }

        //remove cuts in holder
        if(numberOfCuts>0){
            for(a=[0:360/numberOfCuts:359]){
                rotate([0,0,a]){
                      //cut  section hole
                    hull(){
                        translate([0,maxRadius+cutOffset,-tolerance])cylinder(r=cutRadius,h=maxHeight+tolerance*2);
                    }
                }
            }
        }
    }
}

/*
 * creates a hexagon head for a screw or a nut
 * original method  from http://www.thingiverse.com/thing:269863
 *
 * @param hg   height of the head
 * @param df   width across flat (take 0.1 less!)
 * @param $fn  should be 30 minimum (do not use $fs or $fa)
 */
module hex_head(hg, df)
{
	rd0 = df/2/sin(60);

	x0 = 0; x1 = df/2; x2 = x1+hg/2;
	y0 = 0; y1 = hg/2; y2 = hg;

	intersection()
	{
		cylinder(
				h = hg,
				r = rd0,
				$fn = 6,
				center = false
			);

		rotate_extrude(convexity = 10)
		polygon([ [x0, y0], [x1, y0], [x2, y1], [x1, y2], [x0, y2] ]);
	}
}

/*
 * returns the width across flat (tool size) for an ISO M-Number (take 0.1 less!)
 * original method  from http://www.thingiverse.com/thing:269863
 *
 * @param d    the iso diameter
 */
function get_iso_waf(d) = lookup(d,
	[
		[ 1  ,  2  ],
		[ 1.2,  2.5],
		[ 1.6,  3.2],
		[ 2  ,  4  ],
		[ 2.5,  5  ],
		[ 3  ,  5.5],
		[ 4  ,  7  ],
		[ 5  ,  8  ],
		[ 6  , 10  ],
		[ 8  , 13  ],
		[10  , 17  ],
		[12  , 19  ],
		[16  , 24  ],
		[20  , 30  ],
		[24  , 36  ],
		[30  , 46  ],
		[36  , 55  ],
		[42  , 65  ],
		[48  , 75  ],
		[56  , 85  ],
		[64  , 96  ]
	]
);

knob(numberOfCuts=numberOfCuts,minRadius=minRadius,maxRadiusChamfer=maxRadiusChamfer,maxHeight=maxHeight,holderHeight=holderHeight,
    cutRadius=cutRadius,cutOffset=cutOffset,holderChamfer=holderChamfer,headIso=headIso,headHeight=headHeight,screwHeadSafetyHeight=screwHeadSafetyHeight,tolerance=tolerance);
```


[User]
I'm looking to create a cable organizer that can be either screwed or adhered to a wall. It should have a back plate, and then arms that extend outward with slots for holding cables. I'd like it to be parametric so I can adjust the dimensions easily.

Here are the specific details I have in mind:

*   **Back Plate:**
    *   Height:  I want to be able to set this, and I'll call it `Height`.
    *   Thickness:  This will be `BackThickness`.
*   **Arms:**
    *   Total depth from the back plate to the tip of the arm will be `Depth`.
    *   The vertical thickness (or height) of the arms will be `ArmThickness`.
    *   The width of each arm will be `ArmWidth`.
    *   The end of the arms should be angled upwards by `AngleDegrees`.
    *   The length of this angled part is `AngledLength`.
*   **Slots:**
    *   The gap between the arms, where the cables sit, is `SlotWidth`.
    *   I'll need to be able to specify the number of slots, which will be `SlotCount`.
*   **Fillets:**
    *   There needs to be a fillet between the back plate and the arms for strength, radius of `FilletRadius`.
*   **Mounting Holes:**
    *   I'd like to choose between no mounting holes, circular mounting holes, or keyhole mounting holes via the parameter `HoleStyle` (0 for none, 1 for circular, 2 for keyhole).
    *   For circular holes, the diameter will be `BoltDiameter`.
    *   For keyhole holes, I'll need both the `BoltDiameter` for the small circular part and a `BoltHeadDiameter` for the larger part.
    *   The number of mounting holes is `BoltCount`.

*   **Robustness Support**
    *   There needs to be an added support at the base of each prong
    *   The length of the support is `Support_length`
    *   The height of the support is `Support_height`
    *   The width of the support is `Support_strength`

I also want to be able to control the detail level with `$fn`.

Could you generate the OpenSCAD code for this? I don't need any external libraries.

[Assistant]
CableOrganizer.scad:
```
// Height of back plate
Height = 32;
// Thickness of back plate
BackThickness = 2;
// Total distance from back plate to tip of arms
Depth = 75;
// Fillet between back plate and arms for strength
FilletRadius = 6;

// Vertical thickness of Arms/Prongs
ArmThickness = 2;
// Arm Width
ArmWidth = 12;
// How much end of arm is angled above horizontal
AngleDegrees = 45;
// Length of angled portion of arms
AngledLength = 5;
// Gap between arms
SlotWidth = 7;
// How many slot for holding leads
SlotCount = 9;
// Detail
$fn = 50;

// Bolt/Screw hole style, none for adhesive mounting
HoleStyle = 1; // [0:None,1:Circular,2:Keyhole]
// Bolt thread outer diameter
BoltDiameter = 4;
// Only for "Keyhole" style
BoltHeadDiameter = 8;
// Number of mounting holes
BoltCount = 3; // [2:8]

// Length of robustness support
Support_length=30;
// Height of robustness support
Support_height=20;
// Width of robustness support
Support_strength=1.5;

TotalLength = SlotCount * SlotWidth + ArmWidth * (SlotCount + 1);
HoleInset = (Height - FilletRadius) / 2;
DepthLessAngle = Depth - AngledLength * cos(AngleDegrees);

module KeyHole(dlarge,dsmall,depth) {
  err = 0.01; // avoid coincident faces
  translate([0,0,-err/2]) {
    cylinder(h=depth + err,d=dsmall);
    translate([0,dlarge,0]) cylinder(h=depth + err,d=dlarge);
    translate([0,dlarge / 2, (depth + err) / 2]) cube([dsmall, dlarge, depth + err], center = true);
  }
}

module insidefillet(r, length) {
  err = 0.01;
  difference () {
   translate([0,r/2,r/2]) cube([length,r,r], center=true);
   translate([0,r,r]) rotate([0,90,0]) cylinder(h=length+2*err, r=r, center=true);
  }
}

module outsidefillet(r, length) {
  err = 0.01;
  translate([length / 2,0,0])
  difference () {
   translate([0,r,r]) cube([length+err,r*2,r*2], center=true);
   rotate([0,90,0]) cylinder(h=length+2*err, r=r, center=true);
  }
}

err = 0.01;
difference() {
  union() {
    translate([-TotalLength/2,0,0]) {
      cube([TotalLength,BackThickness,Height]);
      cube([TotalLength, DepthLessAngle, ArmThickness]);
      translate([0,DepthLessAngle]) rotate([AngleDegrees,0,0])
        cube([TotalLength, AngledLength, ArmThickness]);
    }
    translate([0,BackThickness-err,ArmThickness-err]) insidefillet(FilletRadius, TotalLength);

  for(i = [1:SlotCount+1]) {
    translate([-TotalLength / 2 + ArmWidth + (i-1) * (ArmWidth + SlotWidth), 0, 0])
    union() {
      translate([-(ArmWidth-Support_strength)*.5, 0, 0]) rotate([0,-90,0]) linear_extrude(Support_strength)polygon(points=[[0,0],[0,Support_length],[Support_height,0]]);//cube([1.5, Depth, ArmThickness + AngledLength + err*2]);
    }
  }

  }
  translate([TotalLength / 2 - HoleInset, 0, Height - HoleInset]) rotate([90,0,90])
    outsidefillet(HoleInset, BackThickness + err);
  translate([-TotalLength / 2 + HoleInset, 0, Height - HoleInset]) rotate([0,0,90])
    outsidefillet(HoleInset, BackThickness + err);

  totalBoltDistance = TotalLength - HoleInset * 2;
  for (offset = [0: totalBoltDistance / (BoltCount - 1): totalBoltDistance]) {
    if (HoleStyle == 2)
      translate([-TotalLength / 2 + HoleInset + offset, 0, Height - HoleInset]) rotate([-90,0,0])
        KeyHole(BoltHeadDiameter, BoltDiameter, BackThickness+FilletRadius*2);
    else if (HoleStyle == 1)
      translate([-TotalLength / 2 + HoleInset + offset, -err, Height - HoleInset]) rotate([-90,0,0])
        cylinder(h = BackThickness + err * 2, d = BoltDiameter);
  }

  for(i = [1:SlotCount]) {
    translate([-TotalLength / 2 + ArmWidth + (i-1) * (ArmWidth + SlotWidth), BackThickness + FilletRadius + SlotWidth / 2, -err])
    union() {
      translate([SlotWidth/2, 0, 0]) cylinder(h = ArmThickness + AngledLength + err*2, d = SlotWidth);
      cube([SlotWidth, Depth, ArmThickness + AngledLength + err*2]);
    }
  }
}

```


[User]
Hey, I'm looking to design a cufflink with a twist-latch mechanism, and I'd like some help generating the OpenSCAD code for it. I've got some specific ideas about how I want it to look and work, which I'll lay out here.

The cufflink should consist of three main parts: a top piece, a stem, and a bottom piece. The top will be a sort of flattened block, and the bottom will be a cylinder. The stem will connect the two with a twist-lock design that requires a slight rotation to engage or disengage.

Here's a more detailed breakdown of the parts and how they should interact:

**Top Piece:** This is the visible part of the cufflink when worn. It should be a rectangular block with rounded edges (basically a minkowski-summed cube and cylinder), and I'd like to be able to engrave text on the top and sides. There should be some parameters so I can adjust the overall dimensions (length, width, and height), as well as text, and text depth. The top piece should have a hole that runs through the center of it to accept the stem.

**Stem:** This should be a simple cylinder, with the ability to vary the length and radius. It needs a small rectangular nub near the base that fits into a corresponding notch on the bottom piece to enable the twist-lock.

**Bottom Piece:** This is a cylindrical base with a central hole that fits over the stem. It should have a notch that the nub on the stem locks into when rotated, which is what makes the cufflink stay together. I should be able to adjust the cylinder's height and radius, and the length of the notch cut. I want the notch to be a short distance from the base of the cylinder, and cut all the way through the cylinder walls. There should also be a small cylindrical cutout, that is slightly larger than the rectangular notch, to act as a space for the nub to rotate.

**Other Considerations**

*   I'd like the hole in the top and bottom to be slightly larger than the stem's radius, to ensure smooth rotation.
*   It would be great if the code is parametric, so I can easily adjust dimensions like the overall size of the top piece, stem length, bottom piece size, and text depth without having to change a ton of stuff.
*   I'm fine with this as a single SCAD file.
*   It should be easy to hide any one of the parts using a boolean.
*   I want the text on each side to be different.

I think that's about it. I'm looking forward to seeing what you come up with! I do not need any external libraries for this.

[Assistant]
cufflink_twist_v1.scad:
```
// Cufflink with twist-latch v1.0
// -------------------------------
// Designed by Assaf Sternberg 2/4/2016
// License: Creative Commons 4.0 (Attribution)
// http://creativecommons.org/licenses/by/4.0/legalcode

// set to false to hide component
showtop=true;
showstem=true;
showbottom=true;

// parameters
toptext="A.S";
side1text="A.S";
side2text="A.S";
bottomheight = 4;
bottomradius=5.65;
stemlength=12;
stemradius=2;
holeradius =stemradius+0.15; // hole is slightly larger than stem to allow for turning
topx=7.5;
toplengthy=20;
notchlength = 4;
topz=7.5;
textdepth=2.5;

distancebetweenparts=15;
$fn=100;

//Implementation

module bottom()
{
    translate([0,0,bottomheight/2])
    difference(){
        cylinder(h=bottomheight, r1=bottomradius, r2=bottomradius, center=true);
        cylinder(h=bottomheight, r1=holeradius, r2=holeradius, center=true);
        translate([-1,0,-bottomheight/2])
        cube([2.1,notchlength*1.05,bottomheight]);
        translate([0,0,bottomheight/2-0.7])
        cylinder(h=1.5,r1=notchlength*1.05, r2=notchlength*1.05,center=true);   }
}
module topwithstem(){

    translate([0,0,-bottomheight/2])
    union()
    {

        difference(){
         translate([0,0,bottomheight/2+topz/2])
         minkowski()
        {
            cube([topx,toplengthy,topz],center=true);
            cylinder(h = 1, r1 = 1, r2 = 1, center = true);
        }

        translate([0,0,bottomheight+topz-textdepth/2])
        linear_extrude(height = textdepth, center = true, convexity = 10)
        rotate([0,0,90])
           text(toptext,size=4.8,halign="center",valign="center");

        translate([topx/2+1,0,bottomheight/2+topz/2])
        rotate([90,180,90])
        linear_extrude(height = textdepth, center = true, convexity = 10)
        rotate([180,180,0]) // mirror
           text(side1text,size=4.8,halign="center",valign="center");

        translate([-(topx/2+1),0,bottomheight/2+topz/2])
        rotate([90,180,90])
        linear_extrude(height = textdepth, center = true, convexity = 10)
        rotate([180,0,0]) // mirror
           text(side2text,size=4.8,halign="center",valign="center");

         }

         }

            if (showstem){
            translate([0,0,-stemlength])
            union()
            {
                translate([0,0,stemlength/2])
                    stem(stemlength,stemradius);
                translate([-1,0,0])
                    cube([2,notchlength,2]);
            }
    }
}

module stem(stemlength,stemradius)
{
    cylinder(h=stemlength, r1=stemradius,r2=stemradius,center=true);
}

if (showtop)
{
    translate([distancebetweenparts,0,-topz-1/2])
    topwithstem();
}
if (showbottom)
{
    rotate([0,180,0])
    bottom();
}

```


[User]
Hey, I'm looking to create a really flexible, parametric vehicle generator in OpenSCAD. I want something that can produce a wide range of car-like shapes, from more traditional to pretty unusual. The key is that it should be driven by a bunch of random parameters, but in a way that still mostly results in a coherent-looking vehicle.

Here are the kinds of parameters I think would be important to control, and some ideas about how to randomize them:

*   **Overall Length:** I'd like this to be a major driver. Maybe determine a forward wheel base and a rear wheel base independently (but within some range).  Also, introduce some variation into those wheelbases using some randomness, and maybe have a longer wheelbase as an option as well.
*   **Width:** This would relate to the "track width". I think this can just have a simpler random range.
*   **Height:** This is a bit more complex, and I'd like the overall height to be influenced by both a base height, and some variation based on the length of the car.
*   **Cab Length and Shape:** The length of the cabin, and its width and height, all should have random variability. Maybe also allow a little bit of control over how boxy or curvy it is?
*   **Hood Length and Shape:** Similar to the cab, this should also have randomized dimensions, and perhaps relate the hood height to the cab height to some extent.
*   **Trunk Length and Shape:**  Again, randomize these, and maybe make the trunk length dependent on the total car length and the cab + hood lengths. Make the trunk height a function of total height with a little extra random variation.
*   **Wheel Placement:**  The location of the front axle should be placed, and then the rear axles should be placed in such a way that they are not too close together, and generally follow the overall length of the car. I'd like to support single and multiple rear axles on each side, with the number depending on a random choice.
*   **Fenders:** The fenders should extend out from the axles. They need to have random lengths, widths and heights and also include a little bit of variation based on if the front and rear wheelbases are different.
*   **Body:** The central body of the car should connect all these parts, and should generally have a boxy form but with some rounding and smooth transitions.

I'd like the following things to be randomized at the beginning of the file:
`fwd`, `war`, `rwd`, `tw`, `l`, `h`, `cabl`, `cabw`, `cabh`, `hoodl`, `hoodw`, `hoodh`, `trunkl`, `trunkw`, `trunkh`, `fax`, `rax`, `fenderl`, `fenderw`, `fenderh`, `bodyl`, `bodyw`, `bodyh`, `dice`, `wildstore`, `rsize`, `fn`

The vehicle should be assembled from basic primitives like cubes, spheres, and cylinders.  Also, make liberal use of `hull()` to round and smoothly blend all the edges of the vehicle.

Finally, the design should allow for optional wheels and their placement should match the axle placements. The wheels themselves don't need to be too complex, simple cylinders or flat disks should be fine.

Can you generate all the necessary SCAD files for this? I'm not expecting to use any additional libraries like MCAD or BOSL.

[Assistant]
vehicle.scad:
```

// No Preview. Just hit Create.   Always leave Part at 1"
part=1;//[1,2,3,4,5,6,7,8,9,10]
/* [Hidden] */

fwd=rnd(30,50);
war=[fwd,fwd,fwd,fwd,fwd,fwd,fwd,fwd,fwd,fwd+fwd*floor(rnd(0,2))];
rwd=war[floor(srnd(0,9))];
tw=rnd(40,60) ;
l=max(rwd*1.5+fwd*1.5,srnd(tw*2.5,350))-abs(rwd-fwd)*4;
h=min(tw*2,(srnd(0,tw)+l*0.2))+abs(rwd-fwd);

cabl=max(tw*1.5,srnd(tw,l*abs(rnd(-0.99,0.99)))-l*0.2);

cabw=tw*srnd(0.8,1)+abs(rwd-fwd)*0.5;
cabh=max(tw,h+(l-cabl)*0.1+abs(rwd-fwd)*0.3);
hoodl=max(0.01,srnd(0,(l*0.3)-cabl*0.1)+abs(rwd-fwd)*1.2);
hoodw=tw*srnd(0.6,1.1)-abs(rwd-fwd)*0.1;
hoodh=cabh*0.72-cabl*0.05;

trunkl=l-(cabl+hoodl)-cabl*0.1+40;
trunkw=cabw;
trunkh=max(cabh*0.2,h*srnd(0.5,1.1)+l*0.05);
fax=fwd*0.75;
rax=max(fax+fwd+rwd/2,min(l-trunkl/2+rwd*2,l-rwd)-abs(rwd-fwd));
fenderl=fwd*1.5;
fenderw=(fwd*0.75)+abs(rwd-fwd);
fenderh=max(0,fwd*0.75);
bodyl=max(0,l-abs(rwd-fwd)*3);
bodyw=tw*1.05;
bodyh=fenderh*0.7;
dice=rands(0,2,10);
wildstore=rands(-4,4,1000);
rsize=5;
fn=8;

//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

mirrorcopy() {
difference() {
union() {
 translate([0,0,abs(rwd-fwd)*0.5]) color("red") rcube([hoodl*2, hoodw, hoodh],2,6,10);
if(trunkl<cabl+hoodl&&fwd==rwd) {
    color("red")union() {
     translate([hoodl, 0, 0]) {
   cab(); }

       translate([hoodl+cabl+trunkl-20, 0, 0]) {mirror([-1,0,0]) rcube([trunkl, trunkw, trunkh],rsize,fn,30);

     }}}
else
      {
color("red")translate([hoodl, 0, abs(rwd-fwd)*0.7])cab();
          *hull(){translate([hoodl, 0, abs(rwd-fwd)]) {
      rcube([min(cabl,l*0.25), cabw, cabh],rsize,fn,40);
      translate([cabl-min(cabl,l*0.25), 0, 0])   rcube([min(cabl,l*0.25), cabw, cabh],rsize,fn,50);
         }
     }
     if (fwd==rwd) {
         if(dice[0]<1.5){ color("white")translate([l-trunkl+35, 0, bodyh])  rotate([0,0,0])  scube([trunkl*1.1, tw*0.95, trunkh*1.2],rsize,fn,60);}
         else {color("darkgrey") if(l<100)
      {*mirror([-1,0,0]) rcube([trunkl, trunkw, trunkh],rsize,fn,70);}
        translate([l-trunkl*0.3,0,bodyh])
        rotate([-85,0,90])wheel(tw*1.2);}}
    }
if (fwd==rwd){
color("red") translate([0, 0, 0]) {rcube([bodyl, bodyw, bodyh],rsize,fn,80);}

  color("red") translate([fax, tw, 0]) {
    translate([-fenderl * 0.5, -fenderw*0.7, 0]) rcube([fenderl, fenderw, fenderh],rsize,fn,90);}}

if (fwd==rwd) {     color("red")
if(trunkl * .4 > rwd||l>rwd*5) {
     for(nax = [rax: -rwd: max(rax - rwd * 2, min(l-rwd*2,l - trunkl + rwd))]){
      translate([nax, tw, 0]) translate([-fenderl * 0.5, -fenderw*0.7, 0]) rcube([fenderl, fenderw, fenderh],rsize,fn,100);
    }
  } else {
    translate([rax, tw, 0]) scale(1.1) translate([-fenderl * 0.5, -fenderw*0.7, 0]) rcube([fenderl, fenderw, fenderh],rsize,fn,110);
  }}

/* line([0, 0, 0], [l, 0, 0]);
color("red") translate([fax, tw, 0]) {
  translate([-fenderl * 0.5, -fenderw, 0]) rcube([fenderl, fenderw, fenderh]);    }*/
}
/////////////cutters////////////////////////////////

translate([fax, tw, 0]) union(){
translate([0,-fwd*0.1,0])scale(1.1) flatwheel(fwd);
rotate([0, 0, 180]) translate([0,fwd*0.1,0])scale([1, 3, 1]) flatwheel(fwd);
 color("red") rotate([0, 0, 180]) translate([0,-fwd*0.1,0]) scale([2, 2, 2]) flatwheel(fwd);
}
if(trunkl * .4 > rwd||l>rwd*5) {
  for(nax = [rax: -rwd: max(rax - rwd * 2, min(l-rwd*2,l - trunkl + rwd))]){
  translate([nax, tw, 0]) {
    scale(1.1) flatwheel(rwd);
    rotate([0, 0, 180]) scale([1, 3, 1]) flatwheel(rwd);
  color("red")   rotate([0, 0, 180]) translate([0,-rwd*0.1,0]) scale([6, 6, 6]) flatwheel(rwd);
  }
}
} else {
translate([0,-fwd*0.1,0])translate([rax, tw+abs(rwd-fwd)*0.5, 0]) {
  scale(1.1) flatwheel(rwd);
  rotate([0, 0, 180]) scale([1, 3, 1]) flatwheel(rwd);
 color("red")  rotate([0, 0, 180]) translate([0,-rwd*0.1,0]) scale([6, 6, 6]) flatwheel(rwd);

}
}
}

/////////////////////////////////////////////////
color("lightgray")translate([-5,0,0])hull(){translate([-5,0,0])scube([5,tw*0.45,h*0.2],rsize,fn,120);
translate([-2,0,])scube([15,tw*1.05-abs(rwd-fwd)*0.5,h*0.2],rsize,fn,130);}

color("lightgray")translate([l+10,0,0])mirror([-1,0,0])hull(){translate([-5,0,0])scube([5,tw*0.45,h*0.2],rsize,fn,140);
translate([-2,0,])scube([15,tw*1.05-abs(rwd-fwd)*0.5,h*0.2],rsize,fn,150);}

//line([fax, 0, 0], [fax, tw, 0],3);
color("darkgrey"){line([fax, 0, 0], [fax, tw*0.9, 0],4);
    translate ([fax, 0, 0] )sphere(fwd*0.25) ;
translate([5,0,-2])scube([max(l-tw*0.45,rax),tw*0.45,rwd*0.5],rsize,fn,160);
translate([fax, tw, 0])rotate([rnd(-5,5),0,rnd(-5,5)]) wheel(fwd);
if(trunkl * .4 > rwd||l>rwd*5) {
for(nax = [rax: -rwd: max(rax - rwd * 2, min(l-rwd*2,l - trunkl + rwd))]) {
translate([nax, tw, 0])rotate([rnd(-15,5),0,0]) wheel(rwd);
 line([nax, 0, rwd/2-min(rwd,fwd)/2], [nax, tw*0.9, rwd/2-min(rwd,fwd)/2],5);
  translate ([nax, 0, rwd/2-min(rwd,fwd)/2] )sphere(fwd*0.25) ;
}
} else {
translate([rax, tw+abs(rwd-fwd)*0.5, 0])rotate([rnd(-15,5),0,0]) wheel(rwd);
 line([rax, 0, rwd/2-min(rwd,fwd)/2], [rax, tw*0.9, rwd/2-min(rwd,fwd)/2],5);
     translate ([rax, 0, rwd/2-min(rwd,fwd)/2] )sphere(rwd*0.25) ;
}

}}
 //end main
////////////////////////////////////////////////
///////////////////////////////////////////////
module cab(){
      difference(){ rcube([cabl, cabw, cabh],2,6,20);
                   mirrorcopy(){ cutrcube([cabl, cabw, cabh],2,6,20);} }
    }
module rcube(v, r = 2, n = 6,s=0) {
rc = r;
x = v[0];
y = v[1];
z = v[2];
hull() {
hull() {
    translate(ywilde(s+1)+[rc, 0, rc]) sphere(r, $fn = n);
    translate(wilde(s+1)+[rc, 0.7*y - rc, rc]) sphere(r, $fn = n);
    translate(ywilde(s+3)+[rc, 0, 0.7 * z - rc]) sphere(r, $fn = n);
    translate(wilde(s+3)+[rc, 0.7*y - rc, 0.7 * z - rc]) sphere(r, $fn = n);
} hull() {
    translate(ywilde(s+5)+[0.4 * x, 0, z - rc]) sphere(r, $fn = n);
    translate(wilde(s+6)+[0.4 * x, 0.7*y - rc, z - rc]) sphere(r, $fn = n);
    translate(ywilde(s+7)+[0.8 * x, 0, z - rc]) sphere(r, $fn = n);
    translate(wilde(s+8)+[0.8 * x, 0.7*y - rc, z - rc]) sphere(r, $fn = n);
} hull() {
    translate(ywilde(s+9)+[x, 0, rc]) sphere(r, $fn = n);
    translate(wilde(s+10)+[x, y - rc, rc]) sphere(r, $fn = n);
    //translate([x, 0, z - rc]) sphere(r, $fn = n);
    //translate([x, y - rc, z - rc]) sphere(r, $fn = n);

    translate(ywilde(s)+[x, 0, 0.9 * z - rc]) sphere(r, $fn = n);
    translate(wilde(s)+[x, 0.7*y - rc, 0.9 * z - rc]) sphere(r, $fn = n);
}}
}

module cutrcube(v, r = 4, n = 4,s=0) {
rc = 3;
    rh=rc*0.3;
r2=1;
x = v[0];
y = v[1]*0.95;
z = v[2];

   // translate(ywilde(s+1)+[rc, 0, rc]) sphere(r2, $fn = n);
   // translate(wilde(s+2)+[rc, 0.7*y - rc, rc]) sphere(r2, $fn = n);
 translate([-rc,0,0])hull(){
translate(ywilde(s+3)+[rc, 0, 0.7 * z ]) sphere(r2, $fn = n);
    translate(wilde(s+3)+[rc, 0.7*y - rc, 0.7 * z ]) sphere(r2, $fn = n);
    translate(ywilde(s+5)+[0.4 * x-rc, 0, z - rc*2]) sphere(r2, $fn = n);
  translate(wilde(s+6)+[0.4 * x-rc, 0.7*y - rc, z - rc*2]) sphere(r2, $fn = n);

translate(ywilde(s+3)+[-rc, 0, 0.7 * z + rh]) sphere(r2, $fn = n);
    translate(wilde(s+3)+[-rc, 0.7*y - rc, 0.7 * z + rh]) sphere(r2, $fn = n);
    translate(ywilde(s+5)+[0.4 * x-rc*2, 0, z-rc ]) sphere(r2, $fn = n);
  translate(wilde(s+6)+[0.4 * x-rc*2, 0.7*y - rc, z -rc]) sphere(r2, $fn = n);

}  // translate(ywilde(s+7)+[0.8 * x, 0, z - rc]) sphere(r2, $fn = n);
    //translate(wilde(s+8)+[0.8 * x, 0.7*y - rc, z - rc]) sphere(r2, $fn = n);

    //translate(ywilde(s+9)+[x, 0, rc]) sphere(r2, $fn = n);
    //translate(wilde(s+10)+[x, y - rc, rc]) sphere(r2, $fn = n);
    //translate([x, 0, z - rc]) sphere(r, $fn = n);
    //translate([x, y - rc, z - rc]) sphere(r, $fn = n);

    //translate(ywilde(s)+[x, 0, 0.9 * z - rc]) sphere(r2, $fn = n);
  hull(){     translate([0,rh,0]){
      translate(wilde(s+8)+[0.8 * x, 0.7*y , z - rc*2]) sphere(r2, $fn = n);
      translate(wilde(s)+[x-rc, 0.7*y , 0.9 * z-rc*2 ]) sphere(r2, $fn = n);
        translate(wilde(s+4)+[rc*2, 0.7*y , 0.7 * z-rc ]) sphere(r2, $fn = n);
        translate(wilde(s+6)+[0.4 * x, 0.7*y , z-rc*2 ]) sphere(r2, $fn = n);
        translate(wilde(s+4)+[x-rc*2, 0.76*y , 0.7 * z ]) sphere(r2, $fn = n);}
       translate([0,rc*5,0]){
            translate(wilde(s+8)+[0.8 * x, 0.7*y , z - rc*2]) sphere(r2, $fn = n);
           translate(wilde(s)+[x-rc, 0.7*y , 0.9 * z-rc*2 ]) sphere(r2, $fn = n);
        translate(wilde(s+4)+[rc*2, 0.7*y , 0.7 * z-rc ]) sphere(r2, $fn = n);
        translate(wilde(s+6)+[0.4 * x, 0.7*y , z-rc*2 ]) sphere(r2, $fn = n);
        translate(wilde(s+4)+[x-rc*2, 0.76*y , 0.7 * z ]) sphere(r2, $fn = n);}}
}
module scube(v, r = 2, n = 6,s=0) {
rc = r;
x = v[0];
y = v[1];
z = v[2];
dewild=1;
hull() {
hull() {
    translate(dewild*ywilde(s)+[rc, 0, rc]) sphere(r, $fn = n);
    translate(dewild*wilde(s+1)+[rc, y - rc, rc]) sphere(r, $fn = n);
    translate(dewild*ywilde(s+2)+[rc, 0, z - rc]) sphere(r, $fn = n);
    translate(dewild*wilde(s+3)+[rc, y - rc,  z - rc]) sphere(r, $fn = n);
} hull() {
    translate(dewild*ywilde(s+4)+[ x, 0, z - rc]) sphere(r, $fn = n);
    translate(dewild*wilde(s+5)+[ x, y - rc, z - rc]) sphere(r, $fn = n);
} hull() {
    translate(dewild*ywilde(s+6)+[x, 0, rc]) sphere(r, $fn = n);
    translate(dewild*wilde(s+7)+[x, y - rc, rc]) sphere(r, $fn = n);

 }
}}
function wilde(i)=[wildstore[i],wildstore[i*2],wildstore[i*3]];
function ywilde(i)=[wildstore[i],0,wildstore[i*3]];
module wheel(d){

translate ([0,0,d/2-min(rwd,fwd)/2])
rotate([90,0,0]) difference(){ hull(){
    scale([d*0.5,d*0.5,3])sphere(1,$fn=16);
    translate([0,0,d/4])
    scale([d*0.5,d*0.5,3])sphere(1,$fn=16);}
 //cylinder(d/4,d/2,d/2);
      translate([0,0,-1])
    scale([d*0.3,d*0.3,3.5])sphere(1,$fn=16);}
    }

module flatwheel(d){

translate ([0,0,d/2-min(rwd,fwd)/2])
rotate([90,0,0])  cylinder(d/3,d/2,d/2);
}
module extrudeT(v,d=8,start=0,stop=1) {
     detail=1/d;
for(i = [start+detail: detail: stop]) {
   for (j=[0:$children-1])
  hull() {
    translate(t(bez2(i,v))) rotate(bez2euler(i, v))scale(bez2(i  , v)[3]) children(j);
    translate(t(bez2(i - detail, v))) rotate(bez2euler(i - detail, v))scale(bez2(i- detail  , v)[3]) children(j);
  }
}
}

module mirrorextrudeT(v,d=8,start=0,stop=1) {
     detail=1/d;
for(i = [start+detail: detail: stop]) {
   for (j=[0:$children-1])
  hull() {mirrorcopy([0,-1,0]){
    translate(t(bez2(i,v))) rotate(bez2euler(i, v))scale(bez2(i  , v)[3]) children(j);
    translate(t(bez2(i - detail, v))) rotate(bez2euler(i - detail, v))scale(bez2(i- detail  , v)[3]) children(j);
  }}
}
}

module ShowControl(v)
{  // translate(t(v[0])) sphere(v[0][3]);
  for(i=[1:len(v)-1]){
   // vg  translate(t(v[i])) sphere(v[i][3]);
      hull(){
          translate(t(v[i])) sphere(0.5);
          translate(t(v[i-1])) sphere(0.5);
          }          }
  }

module line(a,b,c=0.5){
    hull(){
        translate(a)sphere(c);
        translate(b)sphere(c);

        }

    }

module mirrorcopy(vec=[0,1,0])
{ union(){
children();
mirror(vec) children(); }
}

function  subdv(v)=[
let(last=(len(v)-1)*3)
for (i=[0:last])
  let(j=floor((i+1)/3))

i%3 == 0?
v[j]
:
i%3  == 2?
   v[j]- un(un(pre(v,j))+un(post(v,j)))*(len3(pre(v,j))+len3(post(v,j)))*0.1
    :
   v[j] +un(un(pre(v,j)) +un(post(v,j)))*(len3(pre(v,j))+len3(post(v,j)))*0.1

]
;
function bz2t(v,stop,precision=0.01,t=0,acc=0)=
acc>=stop||t>1?
t:
bz2t(v,stop,precision,t+precision,acc+len3(bez2(t,v)-bez2(t+precision,v)));

function len3bz(v,precision=0.01,t=0,acc=0)=t>1?acc:len3bz(v,precision,t+precision,acc+len3(bez2(t,v)-bez2(t+precision,v)));

function bez2(t, v) = (len(v) > 2) ? bez2(t, [
for(i = [0: len(v) - 2]) v[i] * t + v[i + 1] * (1 - t)
]): v[0] * t + v[1] * (1 - t);
function lim31(l, v) = v / len3(v) * l;
function len3(v) = sqrt(pow(v[0], 2) + pow(v[1], 2) + pow(v[2], 2));
function bez2euler(i, v) = [0, -asin(bez2v(i, v)[2]), atan2(bez2xy(bez2v(i, v))[1], bez2xy(bez2v(i, v))[0])];

function bez2xy(v) = lim31(1, [v[0], v[1], 0]); // down xy projection
function bez2v(i, v) = lim31(1, bez2(i - 0.0001, v) - bez2(i, v)); // unit vector at i
function t(v) = [v[0], v[1], v[2]];
function rndR()=[rands(0,360,1)[0],rands(0,360,1)[1],rands(0,360,1)[0]];
function rndV()=[rands(-1,1,1)[0],rands(-1,1,1)[0],rands(-1,1,1)[0]];
function midpoint(start,end) = start + (end  - start )/2;
function rndc()=[rands(0,1,1)[0],rands(0,1,1)[0],rands(0,1,1)[0]];

  function rnd(a,b)=a+gauss(rands(0,1,1)[0])*(b-a);
  function srnd(a,b)=rands(a,b,1)[0];

function t(v) = [v[0], v[1], v[2]];

function un(v) = v / max(len3(v),0.000001) * 1;
function len3(v) = sqrt(pow(v[0], 2) + pow(v[1], 2) + pow(v[2], 2));
function pre(v,i)= i>0?         (v[i]-v[i-1]):[0,0,0,0];
function post(v,i)=i<len(v)-1?  (v[i+1]-v[i]):[0,0,0,0] ;
function SC3 (a)= let( b=clamp(a))(b * b * (3 - 2 * b));
function clamp (a,b=0,c=10)=min(max(a,b),c);
function gauss(x)=x+(x-SC3(x));
```


[User]
I'd like to create a parametric heart-shaped maze generator in OpenSCAD. I have a pretty good idea of what I'm after based on some existing designs I've seen, which I'll describe below.

The maze should be built within the outline of a heart shape, which is essentially two semicircles joined to two isosceles triangles. The heart's boundary should be parametrically definable by a `heart_height` variable. The maze itself should be constructed of concentric, heart-shaped "rings", where the rings are the walls. The number of these concentric rings is controlled by a `levels` variable and the number of subdivisions or "blocks" in each ring is controlled by a `cblocks` variable. The size of the maze rings should be scaled such that they fit into the heart shape, the `levels` and `heart_height` variable should be sufficient to generate the proper sizing.

The maze will be generated by randomly removing walls between "blocks" in the concentric rings. A path will be generated using a recursive algorithm. The recursive path should start at the innermost ring, and the goal is to reach the outermost ring of the heart. The starting block for the path should be on the top-left most subdivision and the exit on the top-right most subdivision.

There should be a `wall_thickness` variable controlling the thickness of the maze walls and a `wall_height` variable that controls the extrusion height of the walls. There is also a variable named `tip_factor`, I would like this to be used as a way to control the pointedness of the bottom of the heart.

Finally, I'd like two additional parameters: a boolean variable named `bottom` which, if true, will add a bottom layer to the maze, and another boolean variable `ring` which, if true, will add a ring to the top of the maze. The `bottom` layer should be an extrusion of the heart shape with the same `wall_thickness`. The `ring` is a semicircular arc that serves as a handle for the object.

Could you generate the OpenSCAD code for this? I don't want to use any external libraries.

[Assistant]
random_maze_heart_generator.scad:
```
heart_height = 30;
wall_thickness = 1.4;
wall_height = 1;
cblocks = 15;
levels = 3;
tip_factor = 15;
bottom = "YES";
ring = "YES";

// give a [x, y] point and length. draw a line in the x direction
module x_line(point, length, thickness = 1) {
    offset = thickness / 2;
    translate([point[0] - offset, point[1] - offset, 0])
        square([length + thickness, thickness]);
}

module a_quarter_arc(radius, angle, width = 1) {
    outer = radius + width;
    intersection() {
        difference() {
            offset(r = width) circle(radius, $fn=96);
            circle(radius, $fn=96);
        }
        polygon([[0, 0], [outer, 0], [outer, outer * sin(angle)], [outer * cos(angle), outer * sin(angle)]]);
    }
}

module arc(radius, angles, width = 1) {
    angle_from = angles[0];
    angle_to = angles[1];
    angle_difference = angle_to - angle_from;
    outer = radius + width;
    rotate(angle_from)
        if(angle_difference <= 90) {
            a_quarter_arc(radius, angle_difference, width);
        } else if(angle_difference > 90 && angle_difference <= 180) {
            arc(radius, [0, 90], width);
            rotate(90) a_quarter_arc(radius, angle_difference - 90, width);
        } else if(angle_difference > 180 && angle_difference <= 270) {
            arc(radius, [0, 180], width);
            rotate(180) a_quarter_arc(radius, angle_difference - 180, width);
        } else if(angle_difference > 270 && angle_difference <= 360) {
            arc(radius, [0, 270], width);
            rotate(270) a_quarter_arc(radius, angle_difference - 270, width);
       }
}

/*
 * constants, for clearness
 *
 */

// random directions, for picking up a direction to visit the next block
function PERMUTATION_OF_FOUR() = [
    [1, 2, 3, 4],
    [1, 2, 4, 3],
    [1, 3, 2, 4],
    [1, 3, 4, 2],
    [1, 4, 2, 3],
    [1, 4, 3, 2],
    [2, 1, 3, 4],
    [2, 1, 4, 3],
    [2, 3, 1, 4],
    [2, 3, 4, 1],
    [2, 4, 1, 3],
    [2, 4, 3, 1],
    [3, 1, 2, 4],
    [3, 1, 4, 2],
    [3, 2, 1, 4],
    [3, 2, 4, 1],
    [3, 4, 1, 2],
    [3, 4, 2, 1],
    [4, 1, 2, 3],
    [4, 1, 3, 2],
    [4, 2, 1, 3],
    [4, 2, 3, 1],
    [4, 3, 1, 2],
    [4, 3, 2, 1]
];

function NO_WALL() = 0;
function UP_WALL() = 1;
function RIGHT_WALL() = 2;
function UP_RIGHT_WALL() = 3;

function NOT_VISITED() = 0;
function VISITED() = 1;

/*
 * utilities functions
 *
 */

// comare the equality of [x1, y1] and [x2, y2]
function cord_equals(cord1, cord2) = cord1 == cord2;

// is the point visited?
function not_visited(cord, vs, index = 0) =
    index == len(vs) ? true :
        (cord_equals([vs[index][0], vs[index][1]], cord) && vs[index][2] == 1 ? false :
            not_visited(cord, vs, index + 1));

// pick a direction randomly
function rand_dirs() =
    PERMUTATION_OF_FOUR()[round(rands(0, 24, 1)[0])];

// replace v1 in the vector with v2
function replace(v1, v2, vs) =
    [for(i = [0:len(vs) - 1]) vs[i] == v1 ? v2 : vs[i]];

/*
 * functions for generating a maze vector
 *
 */

// initialize a maze
function init_maze(rows, columns) =
    [
	    for(c = [1 : columns])
	        for(r = [1 : rows])
		        [c, r, 0,  UP_RIGHT_WALL()]
	];

// find a vector in the maze vector
function find(i, j, maze_vector, index = 0) =
    index == len(maze_vector) ? [] : (
        cord_equals([i, j], [maze_vector[index][0], maze_vector[index][1]]) ? maze_vector[index] : find(i, j, maze_vector, index + 1)
    );

////
// NO_WALL = 0;
// UP_WALL = 1;
// RIGHT_WALL = 2;
// UP_RIGHT_WALL = 3;
function delete_right_wall(original_block) =
    original_block == NO_WALL() || original_block == RIGHT_WALL() ? NO_WALL() : UP_WALL();

function delete_up_wall(original_block) =
    (original_block == NO_WALL() || original_block == UP_WALL()) ? NO_WALL() : RIGHT_WALL();

function delete_right_wall_of(vs, is_visited, maze_vector) =
    replace(vs, [vs[0], vs[1] , is_visited, delete_right_wall(vs[3])] ,maze_vector);

function delete_up_wall_of(vs, is_visited, maze_vector) =
    replace(vs, [vs[0], vs[1] , is_visited, delete_up_wall(vs[3])] ,maze_vector);

function go_right(i, j, rows, columns, maze_vector) =
    go_maze(i + 1, j, rows, columns, delete_right_wall_of(find(i, j, maze_vector), VISITED(), maze_vector));

function go_up(i, j, rows, columns, maze_vector) =
    go_maze(i, j - 1, rows, columns, delete_up_wall_of(find(i, j, maze_vector), VISITED(), maze_vector));

function visit(v, maze_vector) =
    replace(v, [v[0], v[1], VISITED(), v[3]], maze_vector);

function go_left(i, j, rows, columns, maze_vector) =
    go_maze(i - 1, j, rows, columns, delete_right_wall_of(find(i - 1, j, maze_vector), NOT_VISITED(), maze_vector));

function go_down(i, j, rows, columns, maze_vector) =
    go_maze(i, j + 1, rows, columns, delete_up_wall_of(find(i, j + 1, maze_vector), NOT_VISITED(), maze_vector));

function go_maze(i, j, rows, columns, maze_vector) =
    look_around(i, j, rand_dirs(), rows, columns, visit(find(i, j, maze_vector), maze_vector));

function look_around(i, j, dirs, rows, columns, maze_vector, index = 0) =
    index == 4 ? maze_vector :
        look_around(
            i, j, dirs,
            rows, columns,
            build_wall(i, j, dirs[index], rows, columns, maze_vector),
            index + 1
        );

function build_wall(i, j, n, rows, columns, maze_vector) =
    n == 1 && i != columns && not_visited([i + 1, j], maze_vector) ? go_right(i, j, rows, columns, maze_vector) : (
        n == 2 && j != 1 && not_visited([i, j - 1], maze_vector) ? go_up(i, j, rows, columns, maze_vector)  : (
            n == 3 && i != 1 && not_visited([i - 1, j], maze_vector) ? go_left(i, j,rows, columns,  maze_vector)  : (
                n == 4 && j != rows && not_visited([i, j + 1], maze_vector) ? go_down(i, j, rows, columns, maze_vector) : maze_vector
            )
        )
    );

// The heart is composed of two semi-circles and two isosceles triangles.
// The triangle's two equal sides have length equals to the double `radius` of the circle.
// That's why the `solid_heart` module is drawn according a `radius` parameter.
module solid_heart(radius, tip_factor) {
    offset_h = 2.2360679774997896964091736687313 * radius / 2 - radius * sin(45);
	tip_radius = radius / tip_factor;

    translate([radius * cos(45), offset_h, 0]) rotate([0, 0, -45])
    hull() {
        circle(radius, $fn = 96);
		translate([radius - tip_radius, -radius * 2 + tip_radius, 0])
		    circle(tip_radius, center = true, $fn = 96);
	}

	translate([-radius * cos(45), offset_h, 0]) rotate([0, 0, 45]) hull() {
        circle(radius, $fn = 96);
		translate([-radius + tip_radius, -radius * 2 + tip_radius, 0])
		    circle(tip_radius, center = true, $fn = 96);
	}
}

module ring_heart(radius, tip_factor, thickness) {
    difference() {
	    offset(delta = thickness) solid_heart(radius, tip_factor);
        solid_heart(radius, tip_factor);
	}
}

module ring_heart_sector(radius, angle, tip_factor, thickness, width) {
	intersection() {
		ring_heart(radius - 0.1, tip_factor, thickness + 0.2);
		rotate([0, 0, angle]) x_line([0, 0], radius * 3, thickness, width);
	}
}

module heart_to_heart_wall(radius, length, angle, tip_factor, thickness) {
    intersection() {
        difference() {
            solid_heart(radius + length, tip_factor);
		    solid_heart(radius, tip_factor);
	    }
	    rotate([0, 0, angle])
		    x_line([0, 0], (radius + length) * 2, thickness);
	}
}

module heart_maze(radius, cblocks, levels, tip_factor, height = 1, thickness = 1) {
    full_circle_angle = 360;
    arc_angle = full_circle_angle / cblocks;
	r = radius / (levels + 1);

	maze = go_maze(1, 1, cblocks, levels, replace([levels, cblocks - 1, 0, UP_RIGHT_WALL()], [levels, cblocks - 1, 0, UP_WALL()], init_maze(cblocks, levels)));

	difference() {
		linear_extrude(height) union() {
			for(i = [1 : levels + 1]) {
				ring_heart(r * i, tip_factor, thickness);
			}

			for(i = [0:len(maze) - 1]) {
				cord = maze[i];
				cr = cord[0];
				cc = cord[1] - 1;
				v = cord[3];

				angle = cc * arc_angle;

				if(v == 1 || v == 3) {
					heart_to_heart_wall(r * cr, r, cc * arc_angle + 90, tip_factor, thickness);
				}
			}
	    }

		linear_extrude(height) union() {
		    // maze entry
		    ring_heart_sector(r, 1.5 * arc_angle + 90, tip_factor, thickness, r - thickness / 2);

	        // road to the next level
			for(i = [0:len(maze) - 1]) {
				cord = maze[i];
				cr = cord[0];
				cc = cord[1] - 1;
				v = cord[3];

				if(v == 0 || v == 1) {
					ring_heart_sector(r * (cr + 1), (cc + 0.5) * arc_angle + 90, tip_factor, thickness, r - thickness / 2);
				}
			}
		}
	}
}

heart_maze(heart_height / 3.12, cblocks, levels, tip_factor, wall_height, wall_thickness);

if(bottom == "YES") {
    translate([0, 0, -wall_thickness])
	    linear_extrude(wall_thickness)
		    offset(delta = wall_thickness)
			    solid_heart(heart_height / 3.12, tip_factor, wall_thickness);
}

if(ring == "YES") {
    if(bottom == "YES")  {
	    translate([0, heart_height / 3.12 +  wall_thickness / 2, -wall_thickness / 2])
			linear_extrude(wall_height)
				arc(heart_height / 3.12 / 2, [45, 135], wall_thickness);
	} else {
	    translate([0, heart_height / 3.12 + wall_thickness / 2, 0])
			linear_extrude(wall_height)
				arc(heart_height / 3.12 / 2, [45, 135], wall_thickness);
	}
}
```


[User]
I'd like to design a parametric stand for tablets and phones, something like a dock or holder. I've got a pretty good idea of what I want, but I need it to be generated as an OpenSCAD design.

Essentially, it'll be a wedge-shaped base with a depression where the device sits, tilted back slightly. I need to be able to adjust quite a few things:

*   **Base Dimensions:** I need to set the base's width (`H`) and length (`L`). The width should control the height of the base.
*   **Device Thickness:** The thickness of the device to be held (`T`) needs to be adjustable so that the depression fits correctly.
*   **Inclination:** The angle at which the device leans back (`A`) should be a parameter.
*   **Dock Thickness:** The overall thickness of the base/dock structure (`D`).
*   **Depression Depth:** The depth of the depression where the device sits (`DD`).
*   **Text:** I want to be able to put custom text on the base, with options for the text itself, depth (`TH`), size (`TS`), and its position on the X (`TX`) and Y (`TY`) axes.
*   **Keychain:** It would be nice to have an optional ring for a keychain (`K`). This should be a simple cylinder/torus shape.
*   **Backing Extension:** The length of the back of the base, in two dimensions (`X` and `Y`). This lets me change the look and "style" of the stand.

The basic structure consists of several "walls" (which are really just elongated cylinders with the ends capped off by the same diameter cylinders), so I think that it would make sense to use a module to create those. The text will be embossed into the top surface. I will also need to use a `difference()` to cut out the depression where the device sits and for the keychain loop if needed.

I'm not sure how complex this is, but I'd like to be able to use it to hold everything from a small phone to a full-size tablet. Could you create the necessary OpenSCAD file(s) for this? I don't need any external libraries included.

[Assistant]
ipad.scad:
```
$fn=100*1;
// Base width (millimeter)
H = 16.3;  //  [4:0.1:100]
// Base length (millimeter)
L = 60; // [30:0.1:90]
// Device thickness (millimeter)
T = 8;  //  [8:0.1:12]
// Device inclination (degree)
A = 103.9;  //  [91:0.1:130]
// Dock thickness (millimeter)
D = 4;  //  [2:0.1:8]
// Thickness at depression (millimeter)
DD = 0.2;  //  [0:0.1:2]
// Text
Text = "Thingiverse";
// Text Depth (millimeter)
TH = 0.2; // [0:0.1:1]
// Text Size
TS = 8; // [3:0.1:10]
// Text Position X (millimeter)
TX = -3; // [-10:0.1:10]
// Text Position Y (millimeter)
TY = -11; // [-11:0.1:11]
// Add ring for keychain?
K = 1; // [1:yes, 0:no]
// Backing X (millimeter)
X = 20;  // [0:0.1:30]
// Backing Y (millimeter)
Y = 0;  // [0:0.1:30]

module wall(x1,y1,x2,y2,z,t)
{
    dx=x2-x1;
    dy=y2-y1;
    l = sqrt(dx*dx+dy*dy);
    translate([x1,y1,0])cylinder(h=z,r=t/2);
    translate([x2,y2,0])cylinder(h=z,r=t/2);
    translate([x1+dx/2,y1+dy/2,z/2])rotate(atan2(dy,dx),[0,0,1])cube([l,t,z],center=true);
}

difference()
{
    union()
    {
    wall(30-L,D/2,max(24-X-2*T/2.5+Y/tan(A),30-L),Y+D/2,H,D); // base1
    wall(max(24-X-2*T/2.5+Y/tan(A),30-L),Y+D/2,24-2*T/2.5,D/2,H,D); // base2
    wall(24-2*T/2.5,D/2,30,D/2,H,D); // base0
    wall(24-2*T/2.5+23*cos(A),D/2+23*sin(A),max(24-X-2*T/2.5+Y/tan(A),30-L),Y+D/2,H,D); // back
    wall(30,D/2,6.2*cos(110)+30,6.2*sin(110),H,D); // foot

    if ((Y==0) && (K==1)) {
        difference(){
            translate([-L/2,D+2,0])cylinder(h=3,r=4);
            translate([-L/2,D+2,-1])cylinder(h=6,r=2);
            }
        }// keychain
    }

    translate([0,DD,-1])wall(26.6-T/2.5,T/2+0.5,26.6-T/2.5+47*cos(A),T/2+0.5+47*sin(A),H+2,T); // base depression

    if ((Y==0)) {

    translate([-1.3*L/4+TY,TH,H/2+TX])rotate(0,[0,1,0])rotate(90,[1,0,0])linear_extrude(2*TH)
        text(Text, font="Arial:style=Bold", size = TS); // text

    }

}
```


[User]
Hi there! I'm looking to create a 3D-printable stylus, specifically designed for individuals who might have difficulty using their fingers or gripping smaller, standard styluses. I've got some ideas, and I'd like it to be highly customizable, so I'm thinking OpenSCAD is the way to go.

Essentially, the stylus should have a large, rounded ball on one end for easy contact with a tablet screen, and a cylindrical shaft for gripping. Here's what I'm thinking for the basic design:

1.  **Ball:** It should be a sphere, but I'd like the option to flatten it slightly against the main stylus shaft. I imagine this would be done by subtracting a cube from the base of the sphere. I'd like to control the ball diameter parametrically. Let's call that `ball_diameter`.

2.  **Shaft:** This should be a cylinder, extending from the flattened section of the ball. The length of the shaft should be customizable as well - let's call that `stylus_length`. The diameter of the shaft should also be parametrically adjustable - `stylus_diameter` would work. I would also like a slight narrowing of the shaft towards the end - a small thinner cylinder at the end of the stylus.

3.  **Smoothing:** I'd like to be able to control the overall smoothness of the model, especially the roundness of the ball. So, I'll need a `smoothness` parameter to increase the number of facets used when rendering curved surfaces.

The critical parameters for customization that I need to be able to control are:

*   `ball_diameter`: The diameter of the stylus ball (e.g., 60mm).
*   `stylus_length`: The overall length of the shaft (e.g., 96mm).
*   `stylus_diameter`: The diameter of the stylus shaft (e.g., 7mm).
*   `end_diameter`: The diameter of the small cylinder at the end of the shaft (e.g., 5mm).
*   `end_length`: The length of the small cylinder at the end of the shaft (e.g., 9mm)
*   `smoothness`: The rendering smoothness, impacting the roundness of the ball (e.g., 30).

Could you create the necessary OpenSCAD file(s) for this design? I'm planning on using this to help people with assistive technology needs so having a customizable design is crucial. Thanks a lot!

[Assistant]
ball_stylus_rev_4.scad:
```
// Ball Diameter
ball_d = 60;  // [20:90]
// Stylus Length
stylus = 96;  // [20:230]
// Surface Smoothing
smooth = 30;  // [30:100]

$fn = smooth;
ball = ball_d/2;
union()
{
cylinder (h=stylus/3, r1=ball*sin(acos((ball-5)/ball)), r2=3.5);
difference()
{
translate([0,0,-ball+5])
sphere(ball);
translate([-ball, -ball, -ball*4+10])
cube(ball*2);
}
difference()
{
cylinder (h=stylus, r1=3.5, r2=3.5);
translate([0,0,stylus-9])
cylinder (h=9, r1=2.5, r2=2.5);
}
}
```


[User]
I'd like to create a set of interlocking card trays for board games, similar to the design I found online, but I want it to be fully parametric so I can adjust it for different card sizes and sleeve thicknesses. I'm providing a description of the existing design I found, and would like you to design a set of OpenSCAD files that allows for that.

The existing design has a base with rounded corners and finger access cutouts on each side, a set of walls that surround the cards, and an interlocking mechanism for stacking multiple trays. The walls and base are 2mm thick, and the gaps for finger access are 28mm wide. The design includes some breathing room around the cards, and the height of the walls is adjustable based on the number of cards. The interlocking system is a set of tabs that engage when trays are stacked. The corners of the base and walls are filleted.

Here are the key parameters I need to control:

*   **`cardWidth`**: The width of the card (or sleeve)
*   **`cardHeight`**: The height of the card (or sleeve)
*   **`totalCardDepth`**: The thickness of a single card (or sleeve). This should include any sleeve thickness
*   **`xySpace`**: Extra space around the cards in the x and y dimensions
*   **`zSpace`**: Extra space on top of the stack of cards
*   **`numberOfCards`**: The number of cards the tray should hold
*   **`baseEdgeThickness`**: The thickness of the base edges, which is 7mm in the provided design but I'd like to change this.
*   **`filletSize`**: The radius of the rounded corners. This is currently 8mm for the cutouts.
*   **`interlockClearance`**:  A parameter to control the fit of the interlocking tabs - negative values create an interference fit.
*  **`topBottomInterlockClearance`**: A parameter for the top and bottom of interlocking trays to account for 3D printing variations.
* **`lidOnly`**: A parameter to allow the base to be printed without sides and locks. "yes" or "no".

I'd like the final files to include all of these parameters at the top of the file and a modular design so they're easy to understand. I think the structure of the existing design is fine. The finger holes and the rounded corners can stay as they are. The design uses the fillet function extensively, so make sure you're generating that as a module. I do want to keep the fillet size and the `baseEdgeThickness` as custom parameters, though - don't hardcode their values.

I'm hoping for a parametric approach where I can easily adjust all these dimensions, so please don't hardcode any of the provided dimensions. I believe that covers everything and I'm excited to see the results! I don't have any libraries installed so please avoid using libraries, just stick to vanilla OpenSCAD.

[Assistant]
ICT.scad:
```
/*
cardSizes

TicketToRide
    43.44 x 67.51 x 0.25

Dominion
    58.95 x 90.83 x 0.3

Catan
    54.2 x 80.2 x 0.3

Power Grid Money
    45 x  90 x 0.1

Power Grid Plants
    70 x 70 x 0.25
*/

// if using sleeves, this will be the sleeve width
cardWidth = 70;
// if using sleeves, this will be the sleeve height
cardHeight = 70;
// if using sleeves, this is the total width of a card in a sleeve
totalCardDepth = 0.25;
// additional space around the card, 2 is 1mm at each end
xySpace = 2;
// additional space at the top of the set of cards (it's no fun if they want to fall out all the time). Cards also have imperfections and don't stack perfectly so we'll add a little extra space here.
zSpace = 2.5;
// totalCards to hold
numberOfCards = 50;
// outer edge at the bottom
baseEdgeThickness = 7;
// size of rounded corners at the bottom
filletSize=8;
// this can be tailored based on your printer. A figure of zero essentially means that the points at the end of the interlocking system should exactly touch, so we need to push them together to create a lock. A more accurate printer should permit this figure to get close to the precise figure of -2.
interlockClearance = -1.2;
// another locking clearance parameter, this time for the top/bottom interlock. a typical feature of 3D printing is that the bottom layer is a touch larger than the rest in order to create good bed adhesion, in this case, removing a small sliver from the locking mechanism helps top/bottom stacking to happen cleanly without giving rise to bending trays. You'll tailor this based on your experience with your own printer.
topBottomInterlockClearance = 0.7;
// to allow only a lid to be printed
lidOnly = "no"; //[yes,no]

module basePlate() {
    // start with the easy stuff
    // the bottom layer contains enough space for the card, the perimeter walls at 2mm and the extra breathing space configured
    cube ([cardWidth+4+xySpace, cardHeight+4+xySpace, 2], center=true);
}

module cutOut() {

    cube ([cardWidth-baseEdgeThickness*2, cardHeight-baseEdgeThickness*2, 2.1], center=true);
}

module cutOutFillets() {
    translate ([cardWidth/2-baseEdgeThickness-filletSize/2,cardHeight/2-baseEdgeThickness-filletSize/2,0]) rotate([0,0,180]) fillet(filletSize,2);
    translate ([-(cardWidth/2-baseEdgeThickness-filletSize/2),cardHeight/2-baseEdgeThickness-filletSize/2,0]) rotate([0,0,-90]) fillet(filletSize,2);
    translate ([-(cardWidth/2-baseEdgeThickness-filletSize/2),-(cardHeight/2-baseEdgeThickness-filletSize/2),0]) rotate([0,0,0]) fillet(filletSize,2);
    translate ([cardWidth/2-baseEdgeThickness-filletSize/2,-(cardHeight/2-baseEdgeThickness-filletSize/2),0]) rotate([0,0,90]) fillet(filletSize,2);
}

module fingerAccess() {
    fingerAccessX = (cardWidth+xySpace+2)/2-1;
    fingerAccessY = (cardHeight+xySpace+2)/2-1;
    translate([0,fingerAccessY,0])
    cube([28,4.01,3],center=true);
    translate([0,-fingerAccessY,0])
    cube([28,4.01,3],center=true);
    translate([fingerAccessX,0,0])
    cube([4.01,28,3],center=true);
    translate([-fingerAccessX,0,0])
    cube([4.01,28,3],center=true);
}

module fingerAccessFillets() {
    fingerAccessX = (cardWidth+xySpace+2)/2-2;
    fingerAccessY = (cardHeight+xySpace+2)/2-2;
    translate([-13,fingerAccessY,0])
    fillet(2,2);
    translate([13,fingerAccessY,0])
    rotate([0,0,90])
    fillet(2,2);
    translate([-13,-fingerAccessY,0])
    rotate([0,0,-90])
    fillet(2,2);
    translate([13,-fingerAccessY,0])
    rotate([0,0,180])
    fillet(2,2);
    translate([fingerAccessX,13,0])
    rotate([0,0,-90])
    fillet(2,2);
    translate([fingerAccessX,-13,0])
    rotate([0,0,0])
    fillet(2,2);
    translate([-fingerAccessX,13,0])
    rotate([0,0,180])
    fillet(2,2);
    translate([-fingerAccessX,-13,0])
    rotate([0,0,90])
    fillet(2,2);

}

module edgeWalls() {
    // our edge walls will be 2mm thick; the same as the base
    // we'll need the to be high enough for the stack of cards we want to contain
    // rather than build many separate walls, we'll create a large cube, cutout the center, then cut out the holes in the edges
    translate([0,0,(totalCardDepth*numberOfCards+zSpace)/2])
    difference() {
        // main block
        cube ([cardWidth+4+xySpace, cardHeight+4+xySpace, totalCardDepth*numberOfCards+zSpace], center=true);
        // remove center
        cube ([cardWidth+xySpace, cardHeight+xySpace, totalCardDepth*numberOfCards+zSpace+0.1], center=true);
        // remove centers
        cube([28,cardHeight*2,totalCardDepth*numberOfCards+zSpace+0.1], center=true);
        // remove centers
        cube([cardWidth*2,28,totalCardDepth*numberOfCards+zSpace+0.1], center=true);
        // and lets round those corners to prevent bleeding fingers and nuckles
    }
}

module edgeFillets() {
    filletX = (cardWidth+xySpace+2)/2;
    filletY = (cardHeight+xySpace+2)/2;
    translate([filletX,16,totalCardDepth*numberOfCards+zSpace-2])
        rotate([0,90,0])
        fillet(4,3);

    translate([-filletX,16,totalCardDepth*numberOfCards+zSpace-2])
        rotate([0,90,0])
        fillet(4,3);
    translate([-filletX,-16,totalCardDepth*numberOfCards+zSpace-2])
        rotate([0,90,180])
        fillet(4,3);
    translate([filletX,-16,totalCardDepth*numberOfCards+zSpace-2])
        rotate([0,90,180])
        fillet(4,3);
    translate([-16,filletY,totalCardDepth*numberOfCards+zSpace-2])
        rotate([0,90,90])
        fillet(4,3);
    translate([16,filletY,totalCardDepth*numberOfCards+zSpace-2])
        rotate([0,90,-90])
        fillet(4,3);
    translate([-16,-filletY,totalCardDepth*numberOfCards+zSpace-2])
        rotate([0,90,90])
        fillet(4,3);
    translate([16,-filletY,totalCardDepth*numberOfCards+zSpace-2])
        rotate([0,90,-90])
        fillet(4,3);

}

module lockingPerimeter() {
    translate([0,0,(totalCardDepth*numberOfCards+zSpace)/2+2])
    difference() {
        // main block
                                                                                cube ([cardWidth+8+xySpace, cardHeight+8+xySpace, totalCardDepth*numberOfCards+zSpace+1], center=true);
        // remove center
        cube ([cardWidth+4+xySpace, cardHeight+4+xySpace, totalCardDepth*numberOfCards+zSpace+1.1], center=true);
        // remove centers
        cube([28,cardHeight*2,totalCardDepth*numberOfCards+zSpace+1.1], center=true);
        // remove centers
        cube([cardWidth*2,28,totalCardDepth*numberOfCards+zSpace+1.1], center=true);
        // and lets round those corners to prevent bleeding fingers and nuckles
    }
}

module lock(length,rX,rY,rZ,bcR) {
    translate([0,0,(totalCardDepth*numberOfCards+zSpace+1.1)/2])
    difference() {
        rotate([rX,rY,rZ])
        difference() {
                cube([2,length-interlockClearance,totalCardDepth*numberOfCards+zSpace+1.1],center=true);
                translate([0,(length-interlockClearance)/2,0])
                rotate([0,0,45])
                cube([2,length-interlockClearance,totalCardDepth*numberOfCards+zSpace+1.2],center=true);
        };
        translate([0,0,-(totalCardDepth*numberOfCards+zSpace+1.1)/2])
        rotate([rX,rY,rZ])
        rotate([0,bcR,0])
        cube([2,length+0.1-interlockClearance,totalCardDepth*numberOfCards+zSpace+1.2],center=true);
    }
}

module lockingPerimeter2() {
    translate([(cardWidth+4+2+xySpace)/2,(sideLength/2-14)/4-sideLength/2-interlockClearance/2,1.5])
        lock((sideLength/2-14)/2,0,180,0,45);
    translate([(cardWidth+4+2+xySpace)/2,-((sideLength/2-14)/4-sideLength/2-interlockClearance/2),1.5])
        lock((sideLength/2-14)/2,180,180,0,-45);
    translate([-(cardWidth+4+2+xySpace)/2,(sideLength/2-14)/4+14-interlockClearance/2,1.5])
        lock((sideLength/2-14)/2,0,0,0,-45);
    translate([-(cardWidth+4+2+xySpace)/2,-((sideLength/2-14)/4+14-interlockClearance/2),1.5])
        lock((sideLength/2-14)/2,180,0,0,45);

    translate([-((endLength/2-14)/4-endLength/2-interlockClearance/2),(cardHeight+4+2+xySpace)/2,1.5])
        lock((endLength/2-14)/2,0,180,90,45);
    translate([((endLength/2-14)/4-endLength/2-interlockClearance/2),(cardHeight+4+2+xySpace)/2,1.5])
        lock((endLength/2-14)/2,0,0,270,-45);
    translate([-((endLength/2-14)/4+14-interlockClearance/2),-(cardHeight+4+2+xySpace)/2,1.5])
        lock((endLength/2-14)/2,0,0,90,-45);
    translate([((endLength/2-14)/4+14-interlockClearance/2),-(cardHeight+4+2+xySpace)/2,1.5])
        lock((endLength/2-14)/2,0,180,270,45);

}

module perimeterFillets () {
    translate([-14-2,-(cardHeight+4+2+xySpace)/2,totalCardDepth*numberOfCards+zSpace+1-0.4])
    rotate([0,90,90])
    fillet(4,3);
    translate([-(-14-2),-(cardHeight+4+2+xySpace)/2,totalCardDepth*numberOfCards+zSpace+1-0.4])
    rotate([0,90,-90])
    fillet(4,3);
    translate([-(cardWidth+4+2+xySpace)/2,-(-14-2),totalCardDepth*numberOfCards+zSpace+1-0.4])
    rotate([0,90,0])
    fillet(4,3);
    translate([-(cardWidth+4+2+xySpace)/2,(-14-2),totalCardDepth*numberOfCards+zSpace+1-0.4])
    rotate([0,90,180])
    fillet(4,3);

}

module fillet(r, h) {
    $fn = 60;
    difference() {
        cube([r + 0.01, r + 0.01, h], center = true);

        translate([r/2, r/2, 0])
            cylinder(r = r, h = h + 1, center = true);

    }
}

module topBottomLockAssist() {
    translate([0,0,2+totalCardDepth*numberOfCards+zSpace])
    cube ([cardWidth+4+xySpace+topBottomInterlockClearance, cardHeight+4+xySpace+topBottomInterlockClearance, 2], center=true);
}

sideLength = cardHeight+xySpace+4;
endLength = cardWidth+xySpace+4;

union() {
    difference() {
        // 1. to make the base we'll make a rectangle
        basePlate();
        // 2. and cut out the center and finger access points
        cutOut();
        fingerAccess();
    }
    // 3. then add the fillets()
    cutOutFillets();
    fingerAccessFillets();
    if (lidOnly=="no") {
        // 4. With the base built, we can add the walls
        translate([0,0,1])
        difference() {
            edgeWalls();
            edgeFillets();
        }
        // 5. Now we'll add the inter-locking system
        difference () {
            lockingPerimeter2();
            perimeterFillets();
            topBottomLockAssist();
        }
    }
}
```


[User]
Hey, I'm looking to design a simple glider, something I can 3D print easily, primarily for testing my printer's bed level. I've got a basic idea of the design from something I've seen online, and I'd like to get an OpenSCAD model.

Here's what I'm thinking:

The glider's overall length should be a parameter, let's call it `size`, and I'd like to be able to adjust it between 50mm and 300mm. The design should scale proportionally as I change the `size`.

The wings and tail fins need to be a single layer thick, so I need a parameter for the first layer thickness of my printer, `flthick`. This parameter will determine the extrusion height for those elements.

The glider should have a main body "fuse" that includes a nose weight and a section to mount the wings. It should be mostly a flat shape and the nose should be circular.

The wings will be rectangular and attached to the body. There should be one on each side, mirrored across the glider's center line. I'd like to be able to control their position with a fraction of the overall `size`.

There should be two tail fins; a main horizontal stabilizer in the rear, with two fins, also mirrored, that need to be a fraction of the overall size as well. They should be able to be positioned with relation to the overall `size` parameter.

There's also a small vertical stabilizer on the bottom of the main body near the tail, I'd like that to be a parametric fraction of `size` as well.

I’d like it to be as parametric as possible, so all major dimensions are determined as a multiple of the `size` parameter.

I’m not sure if this will require separate .scad files, or if it can all be put in one single file. If you can just make all the modules work together, that’d be ideal.

I don't need any specific libraries.

[Assistant]
MatchstickGlider.scad:
```
//How Long the Glider is
size = 150;//[50:300]

//How Thick Is your First Printing Layer
flthick = .4;//

module fuse(){
    linear_extrude(size*.05)
    union(){
    circle(size*.04);
translate([-size*.04,0]){
    square([size*.08,size/4]);}
    translate([0,size/4]){
circle(size*.04);}
translate([-flthick*1.5,0]){

square([flthick*3,size]);}
}}

module wing (){
translate([0,size*.4]){
square([size*.35,.22*size]);}
}

module tailfin(){
    difference(){
translate([0,.8*size]){
square([.2*size,.2*size]);}
translate([0,size-flthick*10]){
square([flthick*5,flthick*10]);
    }}
}

module vstab(){
translate([-flthick*1.5,.85*size]){
        linear_extrude(.125*size)
square([flthick*3,.15*size]);}
}

fuse();
vstab();

linear_extrude(flthick)

union(){
wing();
mirror([1,0]){wing();}
tailfin();
mirror([1,0]){tailfin();}}

```


[User]
Hi, I'm looking to design a mouth stick for assistive technology, and I need some help generating the OpenSCAD files. I'd like it to be parametric, so I can easily adjust the dimensions.

Essentially, the design consists of a long, cylindrical stylus section that's used for pointing and interacting with touchscreens, and a bite plate at the other end that the user holds with their mouth. I need the stylus to have a flat bottom and a small hole at the end for a conductive foam insert. The bite plate should have a rounded shape and also have a hole in it so it doesn't feel too bulky. I also want to add a support structure under the bite plate to add some strength to the design.

Here are some of the specific parameters I think I'll need:

*   **`length`**:  The overall length of the stylus portion of the mouthstick. I need to be able to adjust this from about 10 to 350 mm.
*  **`smooth`**: The number of segments to use for curves - probably related to the `$fn` variable.  I think I'd like to be able to adjust this from about 30 to 100.
*   **`bite_plate`**: The size of the bite plate, which effectively controls how wide the mouth section is. I'm thinking values of about 25, 32, 40, and 50 could be useful – representing small, medium, large, and supersized, respectively.

The stylus part should be a cylinder with a diameter of around 7mm or so. It needs a hole at the tip that is about 4mm diameter and 9mm deep to hold the foam.  I need the bottom of the stylus to be flat and not round.  The bite plate can be wider than the stylus, with rounded ends and an opening through it for comfort. Finally, the support section under the bite plate should be a cube shape that follows the curve of the biteplate, I'd like this to rotate upward a bit and be adjustable in height.

I don't have much experience with OpenSCAD, so I'd really appreciate it if you could generate all the necessary code.  I think it'd be easiest to have the main design parameters defined at the top of the file. I'm not using any external libraries, so you won't need to worry about any includes.

[Assistant]
mouthstick_rev_2.scad:
```
// Mouthstick Length
length = 320; // [10:350]
// Surface Smoothing
smooth = 30;  // [30:100]
// Bite Plate Size
bite_plate =50;	//	[25:small, 32:medium, 40:large, 50:supersized]

$fn = smooth;
difference()
{
union()
{
// stylus
rotate([-90,0,0])
{
difference()
{
translate([0,-2.5,0])
cylinder (length, 3.5, 3.5, false);

// hole in end for foam
translate([0,-2.75,length-9])
cylinder (h=9, r1=2, r2=2);

// flat bottom on stylus
translate([-3.5,0,0])
cube ([7, 7, length]);
}
}

// mouthpeice
translate([0,-bite_plate/2,0])
scale ([bite_plate/2,(bite_plate/2)*1.2,1])
{
difference()
{
union()
{
difference()
{
cylinder (h=5, r1=1, r2=1, center=false);
translate ([0,-1,2.5])
cube ([2,2,5], center=true);
}

//rounded bite plate ends
translate ([-.84,0,0])
cylinder (h=5,r1=.16,r2=.16, center=false);

translate ([.84,0,0])
cylinder (h=5,r1=.16,r2=.16, center=false);
}
// inner mouthpeice hole
cylinder (h=5,r1=.68, r2=.68);
}
}
}
translate ([-bite_plate/2,-bite_plate+7, 1])
rotate ([5,0,0])
cube ([bite_plate, bite_plate*2, 30]);
}
```


[User]
Hey, I need an OpenSCAD design for a clip to attach a kitchen plinth to a cylindrical leg. I've got a basic idea, but I need it to be parametric so I can adjust it for different sizes.

Essentially, the clip should consist of two main parts. First, a semi-circular section that grips the cylindrical leg. This section needs to have a cut-out so it doesn't form a full circle and can be clipped onto the leg. The amount of the circle that's cut out needs to be a parameter. Second, a flat mounting plate that screws into the plinth. This plate should have two screw holes for attachment, and be connected to the semi-circular section with struts, and also be parametric.

Here are the parameters I need to be able to control:

*   `diam`: Diameter of the cylindrical leg.
*   `ht`: Height of the clip.
*   `cutpc`: Percentage of the circle's circumference to cut out for the clip opening.
*   `len`: Length from the leg to the plinth, i.e. the distance the plinth will be from the leg.
*   `th`: Thickness of the clip material.
*   `holed`: Diameter of the screw holes.
*   `based`: Depth of the base plate.

The screw holes on the base plate should be spaced so the two screw holes are equidistant from the center of the base, and the distance between screw holes should also be a parameter of the leg diameter. The base plate should also have a parameter for its width.  I think the struts connecting the base plate and the clip should be three pieces, one that runs along the center, and two above and below this one, all of the same thickness.

I'm not very experienced with OpenSCAD, so I'd really appreciate it if you could make this as easy to use as possible. Also, I don't need any external libraries, just the standard OpenSCAD stuff is fine.

[Assistant]
kitchen_base_clip.scad:
```
/*kitchen plinth clip feb 2016 Glyn Cowles */
// diameter of pole
diam=30;
// clip height
ht=10;
//percentage amount to cut off circle to form clip
cutpc=20;
// length to plinth from pole
len=20;
// thickness of clip
th=2;
// diam of screw holes
holed=4;
// base depth
based=6;
holex=diam+th*2+holed; // distance apart of holes
basew=holex+holed*2; // screw part base width

$fn=60;
assemble();

//-------------------------------------------------
module assemble() {
    clip();
    translate([-diam/2-len,-basew/2,0]) screwpart();
}

//-------------------------------------------------
module clip() {
    cut=(diam+2*th)*(cutpc/100);
    difference() {
        union() {
            rotate([0,0,0]) translate([-diam/2-len+based,-th/2,0]) strut();
            cylinder(r=diam/2+th,h=ht);
            }
        cylinder(r=diam/2,h=ht);
        translate([-cut+diam/2+th,-diam/2-th,0]) cube([diam,diam+th*2,ht]);
    }
}
//-------------------------------------------------
module strut() {
    cube([len,th,ht]);
    translate([0,th*3,0]) cube([len,th,ht]);
    translate([0,-th*3,0]) cube([len,th,ht]);
}
//-------------------------------------------------
module screwpart() {
    difference() {
        cube([based,basew,ht]);
        translate([0,-holex/2+basew/2,ht/2]) hol();
        translate([0,holex/2+basew/2,ht/2]) hol();
    }
}
//-------------------------------------------------
module hol() {
    rotate([90,0,90]) cylinder(h=based,r=holed/2);
}
//-------------------------------------------------

```


[User]
I'm looking to design a plant clamp for plants with thick, horizontal roots, similar to the design linked in the description. I'd like the design to be parametric so I can adjust it for different drill and root sizes using the OpenSCAD customizer.

The basic idea is a half-cylinder that will sit against the pot with a clamp to grip the root. The existing design uses a cylinder with a cutout at the bottom and a grid-like clamp on one side. I’d like to be able to control the following parameters:

*   **`root_diameter`**: The diameter of the root the clamp will grip.
*   **`hole_diameter`**: The diameter of the hole drilled into the pot to accommodate the clamp.
*   **`clamp_depth`**: The depth/length of the clamp extending away from the pot (basically the length of the cube).
*   **`clamp_thickness`**: The thickness of the material that makes up the clamp. This will affect the strength.
*   **`clamp_grid_spacing`**: The spacing between the grid elements of the clamp.
*   **`clamp_grid_width`**: The width of each grid element.
*   **`base_radius`**: The radius of the half-cylinder that will rest against the pot.
*   **`base_thickness`**: The thickness of the material making up the base cylinder.
* **`base_cutout_width`**: The width of the cutout on the base for the root to pass through.

I'd like the clamp to consist of two sets of rotated cubes with the gaps between them forming a grid. This is similar to the approach in the linked design, but the parameters should allow control over the spacing and dimensions. The cube grid should be centered on the `clamp_depth` and the `base_cutout_width`.

Could you generate the OpenSCAD code for this? I'm not requesting any specific libraries but think that this would be achievable with basic primitives and transformations.

[Assistant]
plantclamp.scad:
```
$fn = 100*1;

root = 7;
hole = 3;
deep = 15;

thick = sqrt(pow(hole/2,2)+pow(hole/2,2));

difference(){

translate([-root/2,root/2,0]){
    cylinder(r=root/2+1.2,h=thick);
}

translate([-root/2,root/2,-0.01]){
    cylinder(r=root/2,h=thick+02);
}

translate([-25,-50+root/10,-0.01]){
    cube([50,50,thick+0.02]);
}

}

difference(){

    translate([0,-deep+root/2,0]){
        cube([thick,deep,thick]);
    }

    for(i=[0:10]){
        translate([8/1.4 +thick/2,0-i*thick,thick/2]){
            rotate([0,0,45]){
                cube([8,8,thick+0.02],center=true);
            }
        }
        translate([-8/1.4+thick/2,-thick/2-i*thick,thick/2]){
            rotate([0,0,45]){
                cube([8,8,thick+0.02],center=true);
            }
        }
    }
    translate([thick/2,0,-0.01]){
        cube([8,8,thick+0.02]);
    }
}

```


[User]
Hey, I need some help designing a customizable stand holder for a figure, similar to the one I broke. I'm using OpenSCAD, and I want it to be parametric so I can adjust it for different figures and pipe sizes.

Here's the basic idea: The stand should consist of a base with two horizontal bars, a vertical support connecting those bars, and a central cylinder where the figure's torso will be inserted. I've already got a design, but it's hardcoded. I’d like to make this fully configurable.

Here’s what I'm thinking in terms of parameters:

*   **`base_width`**: The overall width of the base (currently 75mm).
*   **`base_depth`**: The depth of the horizontal bars (currently 8mm).
*   **`base_height`**: The height of the horizontal bars (currently 10mm).
*   **`support_width`**: The width of the vertical support (currently 56mm).
*  **`support_depth`**: The depth of the vertical support (currently 62mm)
*   **`support_offset`**: The distance the vertical support is offset from the side of the base (currently calculated from (base_width-support_width)/2)
*    **`pipe_radius`**: The radius of the cylinder (currently 10mm).
*   **`pipe_height`**: The height of the cylinder (currently 40mm).
*   **`pipe_wall_thickness`**: The thickness of the pipe walls (currently 4mm), which will be used to determine the outer cylinder size.
*   **`pipe_offset_y`**: The Y offset of the pipe from the center of the vertical support. (currently 7 mm)

The horizontal bars should be located at roughly 8mm and 62mm along the support depth, as measured from the bottom.  The vertical support should connect them in the center. The cylinder for the pipe will be on top, centered along the width and depth, and should extend out of the top of the vertical support by 7mm.

Can you generate an OpenSCAD file that lets me customize these parameters?

[Assistant]
Stand_Holder.scad:
```
height = 40;
radius = 10;
rad_ext = radius+4;

union(){
	translate([0, 8+2, 0]) cube([75,8,10]);
	translate([0, 62-5, 0]) cube([75,8,10]);
	translate([(75-56)/2, 7, 0]) cube([56,62,10]);
	difference(){
		translate([75/2, 62/2+7, 10]) cylinder(height,rad_ext+5,rad_ext);
		translate([75/2, 62/2+7, 10]) cylinder(height+1,radius,radius);
	}
}
```


[User]
Hey, I'm looking for a way to generate random toy car designs using OpenSCAD. I've seen some cool examples that use a procedural approach, and I want to do something similar.

Basically, the car should be built up from a series of "slices" along its length. Each slice should have a defined shape that can be controlled with bezier curves. I'd like to be able to define several key profile curves, which would form the "outline" of the car (hood, cab, trunk, etc.), and the car body would smoothly transition between these profiles. I'm thinking that each profile curve will actually be comprised of a series of bezier control points in 3D space, so we can get some really complex and interesting body styles.

I need to be able to control the overall length, width, and height of the car, but also the lengths and heights of each main section – the hood, cab, and trunk. I also want to be able to control the width and height of the cab, hood, and trunk individually. It would be awesome if the wheels were placed at random distances, too.

For the body, I'd like it to be based on a 3D poly that transitions through different control curves, with options for a windshield, windows, and a rear window. I want those windows to be generated separately from the main body, and to follow the main body's curvature.

It would also be great if there were some randomization in the generation process, like random dimensions for the different parts, wheel placement along the length, and a general "wildness" factor to make each car unique. I'm thinking of a way to use a random number seed to control the general 'style' of each vehicle.  I'm aiming to have this all fully parametric, so I can tweak variables and get different styles on the fly.

For the wheels, I'd like a simple cylinder shape or something similar.  I also want to have an option to include flat 'wheel hubs' at the center of each wheel, both at the actual wheel and a little further out.

Finally, I'd like to include some line elements that show the axel position, and maybe some visual indication that shows how the random body cuts are being made.

I'm not super concerned about printing tolerances at this stage, just want to generate some cool looking shapes. Can you help me put together the necessary OpenSCAD files?

[Assistant]
CarWars2.scad:
```

// No Preview. Just hit Create.   Always leave Part at 1"
part=1;//[1,2,3,4,5,6,7,8,9,10]
Q=3;//[2:0.5:12]
windows=true;
/* [Hidden] */

fwd=srnd(45,60);
war=[fwd,fwd*3,fwd*2,fwd,fwd,fwd,fwd,fwd,fwd,fwd];
rwd=fwd;
tw=rnd(50,70) ;
l=max(rwd*1.5+fwd*1.5,srnd(tw*3.5,400))-0*4;
h=max(fwd*1.5,min(tw*2,l*srnd(0.01,0.5))+0);
hoodl=max(0.1,l*srnd(0.05,0.3));
cabl=min(l-hoodl,max(tw*1.5,l*srnd(0,0.9)));

cabw=tw*srnd(0.5,1);
cabh=max(tw,h+(l-cabl)*0.1+0*0.3);

hoodw=tw*srnd(0.1,0.7);
hoodh=max(fwd*1.1,cabh*srnd(0.4,0.6));

trunkl=l-(cabl+hoodl);
trunkw=cabw*srnd(0.2,0.9);
trunkh=max(cabh*0.5,h*srnd(0.5,1));
fax=fwd*srnd(0.75,1.5);
rax=max(fax+fwd+rwd/2,min(l-trunkl/2+rwd*2,l-rwd*1.5)-0);
fenderl=fwd*1.5;
fenderw=(fwd*0.75)+0;
fenderh=max(0,fwd*0.75);
bodyl=max(0,l-0*3);
bodyw=tw*1.05;
bodyh=fenderh*0.7;
dice=rands(0,2,10);
wildstore=rands(-2,2,1000);
rsize=5;
fn=8;
LINE1=vsharp([[0,hoodw,0],[0,tw,0],[hoodl,tw,0]]);
LINE2=vsharp([[0,hoodw,0],[0,tw,0],[0,tw,fenderh],[hoodl,tw,fenderh]]);
LINE3=vsharp([[0,hoodw,0],[0,hoodw,hoodh*0.8],[0,hoodw,hoodh*0.8],[0,cabw,hoodh*0.8],[hoodl,cabw,hoodh]]);
LINE4=vsharp([[0,0,0],[0,0,hoodh*0.8],[0,0,hoodh*0.8],[hoodl,0,hoodh]]);

LINE5=vsharp([[hoodl,tw,0],[hoodl+cabl,tw,0],[hoodl+cabl,tw,0]]);
LINE6=vsharp([[hoodl,tw,fenderh],[hoodl+cabl,tw,trunkh],[hoodl+cabl,tw,trunkh],[hoodl+cabl,tw,trunkh],[l,tw,trunkh]]);
LINE7=vsharp([[hoodl,cabw,hoodh],[hoodl+cabl*0.3,cabw,h],[hoodl+cabl*0.3,cabw,h],[hoodl+cabl,cabw,h],[hoodl+cabl,tw,trunkh],[l,trunkw,trunkh]]);
LINE8=vsharp([[hoodl,0,hoodh],[hoodl+cabl*0.3,0,h],[hoodl+cabl*0.3,0,h],[hoodl+cabl,0,h],[hoodl+cabl,0,trunkh],[l,0,trunkh]]);

LINE5b=vsharp([[hoodl,tw,0],[hoodl+cabl*0.5,tw,0],[hoodl+cabl,tw,0]]);
LINE6b=vsharp([[hoodl,tw,fenderh],[hoodl+cabl,tw,trunkh],[hoodl+cabl,tw,trunkh],[hoodl+cabl,tw,trunkh],[l,tw,trunkh]]);
LINE7b=vsharp([[hoodl,cabw,hoodh],[hoodl+cabl*0.3,cabw,h],[hoodl+cabl*0.3,cabw,h],[hoodl+cabl,cabw,h],[hoodl+cabl,tw,trunkh],[l,trunkw,trunkh]]);
LINE8b=vsharp([[hoodl,0,hoodh],[hoodl+cabl*0.3,0,h],[hoodl+cabl*0.3,0,h],[hoodl+cabl,0,h],[hoodl+cabl,0,trunkh],[l,0,trunkh]]);

LINE9=vsharp([[hoodl+cabl,tw,0],[l,tw,0],[l,trunkw,0]]);
LINE10=vsharp([[l,tw,trunkh],[l,trunkw,0]]);
LINE11=vsharp([[l,trunkw,trunkh],[l,trunkw,0]]);
LINE12=vsharp([[l,0,trunkh],[l,0,0]]);
ch=[3,15,h-fenderh*0.5];
trunkr=ch [floor(srnd(0,3))];
echo(hoodl,cabl,trunkl,trunkr);
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

 mirrorcopy() {

   color("red")  difference() {
union() {
difference() {
    union() {
        Carbody(LINE1,LINE2,LINE3,LINE4,Q*2);
        Carbody(LINE5,LINE6,LINE7,LINE8,Q*2);
        Carbody(LINE9,LINE10,LINE11,LINE12,Q*2);

 }
if (windows){
       windshield  (LINE5,LINE6,LINE7,LINE8,Q*2);
 windows(LINE5,LINE6,LINE7,LINE8,Q*2);
 rearwindow  (LINE5,LINE6,LINE7,LINE8,Q);
}
     }

translate([fax, tw, 0])scale(1.4) wheel(fwd);
 if(trunkl * 0.2 > rwd||l>rwd*8) {
for(nax = [rax: -rwd: max(rax - rwd * 2, min(l-rwd*2,l - trunkl + rwd))]) {
translate([nax, tw, 0])scale(1.4) wheel(rwd);

}
} else {
translate([rax, tw+0*0.5, 0])scale(1.4)  wheel(rwd);

}

}
/////////////cutters////////////////////////////////

if(trunkl>cabl+hoodl) {

  color("white")translate([hoodl+cabl+trunkr, 0, bodyh+rsize])  rotate([0,0,0])  scube([trunkl-trunkr, tw*1.7, trunkh*1.2],6,fn,0);}
if(trunkl>cabl&&trunkh<h*0.8) {

  color("white")translate([hoodl+cabl+trunkr+(tw-trunkw), 0, bodyh+rsize])  rotate([0,0,0])  scube([trunkl-trunkr*2-(tw-trunkw), trunkw*0.95-trunkr/2, trunkh*1],5,fn,0);}

   translate([fax, tw, 0]) {  scale(1.1) flatwheel(fwd);
    rotate([0, 0, 180]) scale([1.1, 3, 1.1]) flatwheel(fwd);
  color("red")   rotate([0, 0, 180]) translate([0,-rwd*0.2,0]) scale([6, 6, 6]) flatwheel(fwd);
   }

if(trunkl * 0.2 > rwd||l>rwd*8) {
  for(nax = [rax: -rwd: max(rax - rwd * 2, min(l-rwd*2,l - trunkl + rwd))]){
  translate([nax, tw, 0]) {
    scale(1.1) flatwheel(rwd);
    rotate([0, 0, 180]) scale([1.1, 3, 1.1]) flatwheel(rwd);
  color("red")   rotate([0, 0, 180]) translate([0,-rwd*0.2,0]) scale([6, 6, 6]) flatwheel(rwd);
  }
}
} else {
translate([0,-fwd*0.1,0])translate([rax, tw+0*0.5, 0]) {
  scale(1.1) flatwheel(rwd);
  rotate([0, 0, 180]) scale([1.1, 3, 1.1]) flatwheel(rwd);
 color("red")  rotate([0, 0, 180]) translate([0,-rwd*0.2,0]) scale([6, 6, 6]) flatwheel(rwd);

}
}
translate([0,0,-50])cube([l,tw*2,50]);
}

/////////////////////////////////////////////////

color("lightgray")line([fax, 0, 0], [fax, tw, 0],3);
color("darkgrey"){line([fax, 0, 0], [fax, tw*0.9, 0],4);
    translate ([fax, 0, 0] )rotate([0,90,0])sphere(fwd*0.25,$fn=16) ;
//translate([5,0,-2])scube([max(l-tw*0.45,rax),tw*0.45,rwd*0.2],rsize,fn,160);

translate([fax, tw, 0])rotate([rnd(-5,5),0,rnd(-5,5)]) wheel(fwd);
if(trunkl * 0.2 > rwd||l>rwd*8) {
for(nax = [rax: -rwd: max(rax - rwd * 2, min(l-rwd*2,l - trunkl + rwd))]) {
translate([nax, tw, 0])rotate([rnd(-15,5),0,0]) wheel(rwd);
 line([nax, 0, rwd/2-min(rwd,fwd)/2], [nax, tw*0.9, rwd/2-min(rwd,fwd)/2],5);
  translate ([nax, 0, rwd/2-min(rwd,fwd)/2] )rotate([0,90,0])sphere(fwd*0.25,$fn=16) ;
}
} else {
translate([rax, tw+0*0.5, 0])rotate([rnd(-15,5),0,0]) wheel(rwd);
 line([rax, 0, rwd/2-min(rwd,fwd)/2], [rax, tw*0.9, rwd/2-min(rwd,fwd)/2],5);
     translate ([rax, 0, rwd/2-min(rwd,fwd)/2] )rotate([0,90,0])sphere(rwd*0.25,$fn=16) ;
}

}}

color("lightgray")translate([-5,0,0])hull(){translate([-5,0,0])scube([5,tw*0.45,h*0.2],rsize,fn,0);
translate([-2,0,])scube([15,tw*1.05-0*0.5,h*0.2],rsize,fn,0);}

color("lightgray")translate([l+5,0,0])mirror([-1,0,0])hull(){translate([-5,0,0])scube([5,tw*0.45,h*0.2],rsize,fn,0);
translate([-2,0,])scube([15,tw*1.05-0*0.5,h*0.2],rsize,fn,0);}

if(trunkl>cabl+hoodl) {  union(){
line([0,0,0],[l,0,0]);
  color("white")translate([hoodl+cabl+trunkr, 0, bodyh-rsize])    scube([trunkl-trunkr, tw-trunkr, h*1.2],trunkr,fn*3,0);

  }}
 //end main
////////////////////////////////////////////////
///////////////////////////////////////////////

module Carbody(LINE1,LINE2,LINE3,LINE4,D=Q){
hstep=1/D;
vstep=1/D;

  //  ShowControl(LINE1);
  //  ShowControl(LINE2);
  //  ShowControl(LINE3);
  //  ShowControl(LINE4);

for (t=[0:hstep:1-hstep+0.001]){
spar1=vsharp([ bez2(t, LINE1)+[0,0,0],bez2(t, LINE2),bez2(t, LINE3),bez2(t, LINE3),bez2(t, LINE4)+[0,0,0]]);
spar2=vsharp([ bez2(t+hstep, LINE1)+[0,0,0],bez2(t+hstep, LINE2),bez2(t+hstep, LINE3),bez2(t+hstep, LINE3),bez2(t+hstep, LINE4)+[0,0,0]]);

for (v=[0:vstep:1-vstep+0.001]){

    p1=[((bez2(v, spar1)[0] ) ) ,max(0,bez2(v, spar1)[1] ),bez2(v, spar1)[2]];
    p2=[((bez2(v+vstep, spar1)[0] ) ) ,max(0,bez2(v+vstep, spar1)[1] ),bez2(v+vstep, spar1)[2]];
    p3=[((bez2(v, spar2)[0] ) ) ,max(0,bez2(v, spar2)[1] ),bez2(v, spar2)[2]];
    p4=[((bez2(v+vstep, spar2)[0] ) ) ,max(0,bez2(v+vstep, spar2)[1] ),bez2(v+vstep, spar2)[2]];

poly(p1,p2,p3);
 poly(p4,p3,p2);

}
}
    }
 module windshield(LINE1,LINE2,LINE3,LINE4,D=Q){
hstart=0.7;
hstop=0.95;
vstart=-0.1;
vstop=0.30;
hstep=(hstop-hstart)/D;
vstep=(hstop-hstart)/D;

  //  ShowControl(LINE1);
  //  ShowControl(LINE2);
  //  ShowControl(LINE3);
  //  ShowControl(LINE4);

for (t=[hstart:hstep:hstop-hstep+0.001]){
spar1=vsharp([ bez2(t, LINE1)+[0,0,0],bez2(t, LINE2),bez2(t, LINE3),bez2(t, LINE3),bez2(t, LINE4)+[0,0,0]]);
spar2=vsharp([ bez2(t+hstep, LINE1)+[0,0,0],bez2(t+hstep, LINE2),bez2(t+hstep, LINE3),bez2(t+hstep, LINE3),bez2(t+hstep, LINE4)+[0,0,0]]);

for (v=[vstart:vstep:vstop-vstep+0.001]){

    p1=[((bez2(v, spar1)[0] ) ) ,max(-3,bez2(v, spar1)[1] ),bez2(v, spar1)[2]];
    p2=[((bez2(v+vstep, spar1)[0] ) ) ,max(-3,bez2(v+vstep, spar1)[1] ),bez2(v+vstep, spar1)[2]];
    p3=[((bez2(v, spar2)[0] ) ) ,max(-3,bez2(v, spar2)[1] ),bez2(v, spar2)[2]];
    p4=[((bez2(v+vstep, spar2)[0] ) ) ,max(-3,bez2(v+vstep, spar2)[1] ),bez2(v+vstep, spar2)[2]];

poly(p1,p2,p3,3,false);
 poly(p4,p3,p2,3,false);

}
}
    }
 module rearwindow(LINE1,LINE2,LINE3,LINE4,D=Q){
hstart=0.2;
hstop=0.3;
vstart=-0.1;
vstop=0.35;
hstep=(hstop-hstart)/D;
vstep=(hstop-hstart)/D;

  //  ShowControl(LINE1);
  //  ShowControl(LINE2);
  //  ShowControl(LINE3);
  //  ShowControl(LINE4);

for (t=[hstart:hstep:hstop-hstep+0.001]){
spar1=vsharp([ bez2(t, LINE1)+[0,0,0],bez2(t, LINE2),bez2(t, LINE3),bez2(t, LINE3),bez2(t, LINE4)+[0,0,0]]);
spar2=vsharp([ bez2(t+hstep, LINE1)+[0,0,0],bez2(t+hstep, LINE2),bez2(t+hstep, LINE3),bez2(t+hstep, LINE3),bez2(t+hstep, LINE4)+[0,0,0]]);

for (v=[vstart:vstep:vstop-vstep+0.001]){

    p1=[((bez2(v, spar1)[0] ) ) ,max(-2,bez2(v, spar1)[1] ),bez2(v, spar1)[2]];
    p2=[((bez2(v+vstep, spar1)[0] ) ) ,max(-2,bez2(v+vstep, spar1)[1] ),bez2(v+vstep, spar1)[2]];
    p3=[((bez2(v, spar2)[0] ) ) ,max(-2,bez2(v, spar2)[1] ),bez2(v, spar2)[2]];
    p4=[((bez2(v+vstep, spar2)[0] ) ) ,max(-2,bez2(v+vstep, spar2)[1] ),bez2(v+vstep, spar2)[2]];

poly(p1,p2,p3,2,false);
 poly(p4,p3,p2,2,false);

}
}
    }
  module windows(LINE1,LINE2,LINE3,LINE4,D=Q){
hstart=0.5;
hstop=0.95;
vstart=0.45;
vstop=0.70;
hstep=(hstop-hstart)/D;
vstep=(hstop-hstart)/D;

  //  ShowControl(LINE1);
  //  ShowControl(LINE2);
  //  ShowControl(LINE3);
  //  ShowControl(LINE4);

for (t=[hstart:hstep:hstop-hstep+0.001]){
spar1=vsharp([ bez2(t, LINE1)+[0,0,0],bez2(t, LINE2),bez2(t, LINE3),bez2(t, LINE3),bez2(t, LINE4)+[0,0,0]]);
spar2=vsharp([ bez2(t+hstep, LINE1)+[0,0,0],bez2(t+hstep, LINE2),bez2(t+hstep, LINE3),bez2(t+hstep, LINE3),bez2(t+hstep, LINE4)+[0,0,0]]);

for (v=[vstart:vstep:vstop-vstep+0.001]){

    p1=[(bez2(v, spar1)[0]  )
    ,max(0,bez2(v, spar1)[1] ),
     max(hoodh,bez2(v, spar1)[2])];
    p2=[(bez2(v+vstep, spar1)[0]  ) ,
    max(0,bez2(v+vstep, spar1)[1] ),
     max(hoodh,bez2(v+vstep, spar1)[2])];
    p3=[(bez2(v, spar2)[0]  ) ,
    max(0,bez2(v, spar2)[1] ),
     max(hoodh,bez2(v, spar2)[2])];
    p4=[(bez2(v+vstep, spar2)[0]  ) ,
    max(0,bez2(v+vstep, spar2)[1] ),
    max(hoodh,bez2(v+vstep, spar2)[2])];

poly(p1,p2,p3,2,false);
 poly(p4,p3,p2,2,false);

}
}
    }

    module poly(p1,p2,p3,h1=1,tomidline=true) {

  hull() {

    translate(t(p1)) sphere(h1,$fn=4);
    translate(t(p2)) sphere(h1,$fn=4);
    translate(t(p3))  sphere(h1,$fn=4);
  if (tomidline){
    translate(y(p1)) sphere(h1,$fn=4);
    translate(y(p2)) sphere(h1,$fn=4);
    translate(y(p3)) sphere(h1,$fn=4);
  }}
}

module scube(v, r = 2, n = 6,s=0) {
rc = r;
x = v[0];
y = v[1];
z = v[2];
dewild=s;
hull() {

    translate(dewild*ywilde(s)+[rc, -y, rc]) sphere(r, $fn = n);
    translate(dewild*wilde(s+1)+[rc, y , rc]) sphere(r, $fn = n);
    translate(dewild*ywilde(s+2)+[rc, -y, z - rc]) sphere(r, $fn = n);
    translate(dewild*wilde(s+3)+[rc, y ,  z - rc]) sphere(r, $fn = n);

    translate(dewild*ywilde(s+4)+[ x, -y, z - rc]) sphere(r, $fn = n);
    translate(dewild*wilde(s+5)+[ x, y , z - rc]) sphere(r, $fn = n);
    translate(dewild*ywilde(s+6)+[x, -y, rc]) sphere(r, $fn = n);
    translate(dewild*wilde(s+7)+[x, y , rc]) sphere(r, $fn = n);

}}
function wilde(i)=[wildstore[i],wildstore[i*2],wildstore[i*3]];
function ywilde(i)=[wildstore[i],0,wildstore[i*3]];
module wheel(d){

translate ([0,0,d/2-min(rwd,fwd)/2])
rotate([90,0,0]) difference(){ hull(){
    scale([d*0.5,d*0.5,3])sphere(1,$fn=24);
    translate([0,0,d/4])
    rotate([0,0,7.5]) scale([d*0.5,d*0.5,3])sphere(1,$fn=24);}
 //cylinder(d/4,d/2,d/2);
      translate([0,0,-d/30])
    scale([d*0.3,d*0.3,4.5])sphere(1,$fn=24);
          translate([0,0,d/3.5])
   scale([d*0.3,d*0.3,3.5])sphere(1,$fn=24);}
    }

module flatwheel(d){

translate ([0,0,d/2-min(rwd,fwd)/2])
rotate([90,0,0])  cylinder(d/3,d/2,d/2);
}
module extrudeT(v,d=8,start=0,stop=1) {
     detail=1/d;
for(i = [start+detail: detail: stop]) {
   for (j=[0:$children-1])
  hull() {
    translate(t(bez2(i,v))) rotate(bez2euler(i, v))scale(bez2(i  , v)[3]) children(j);
    translate(t(bez2(i - detail, v))) rotate(bez2euler(i - detail, v))scale(bez2(i- detail  , v)[3]) children(j);
  }
}
}

module mirrorextrudeT(v,d=8,start=0,stop=1) {
     detail=1/d;
for(i = [start+detail: detail: stop]) {
   for (j=[0:$children-1])
  hull() {mirrorcopy([0,-1,0]){
    translate(t(bez2(i,v))) rotate(bez2euler(i, v))scale(bez2(i  , v)[3]) children(j);
    translate(t(bez2(i - detail, v))) rotate(bez2euler(i - detail, v))scale(bez2(i- detail  , v)[3]) children(j);
  }}
}
}

module ShowControl(v)
{  // translate(t(v[0])) sphere(v[0][3]);
  for(i=[1:len(v)-1]){
   // vg  translate(t(v[i])) sphere(v[i][3]);
      hull(){
          translate(t(v[i])) sphere(0.5);
          translate(t(v[i-1])) sphere(0.5);
          }          }
  }

module line(a,b,c=0.5){
    hull(){
        translate(a)sphere(c);
        translate(b)sphere(c);

        }

    }
  module ShowControl(v)
  {  // translate(t(v[0])) sphere(v[0][3]);
      for(i=[1:len(v)-1]){
       // vg  translate(t(v[i])) sphere(v[i][3]);
          hull(){
              translate(t(v[i])) sphere(2);
              translate(t(v[i-1])) sphere(2);
              }          }
      }
module mirrorcopy(vec=[0,1,0])
{ union(){
children();
mirror(vec) children(); }
}

function  subdv(v)=[
let(last=(len(v)-1)*3)
for (i=[0:last])
  let(j=floor((i+1)/3))

i%3 == 0?
v[j]
:
i%3  == 2?
   v[j]- un(un(pre(v,j))+un(post(v,j)))*(len3(pre(v,j))+len3(post(v,j)))*0.1
    :
   v[j] +un(un(pre(v,j)) +un(post(v,j)))*(len3(pre(v,j))+len3(post(v,j)))*0.1

]
;
function bz2t(v,stop,precision=0.01,t=0,acc=0)=
acc>=stop||t>1?
t:
bz2t(v,stop,precision,t+precision,acc+len3(bez2(t,v)-bez2(t+precision,v)));

function len3bz(v,precision=0.01,t=0,acc=0)=t>1?acc:len3bz(v,precision,t+precision,acc+len3(bez2(t,v)-bez2(t+precision,v)));

function bez2(t, v) = (len(v) > 2) ? bez2(t, [
for(i = [0: len(v) - 2]) v[i] * t + v[i + 1] * (1 - t)
]): v[0] * t + v[1] * (1 - t);
function lim31(l, v) = v / len3(v) * l;
function len3(v) = sqrt(pow(v[0], 2) + pow(v[1], 2) + pow(v[2], 2));
function bez2euler(i, v) = [0, -asin(bez2v(i, v)[2]), atan2(bez2xy(bez2v(i, v))[1], bez2xy(bez2v(i, v))[0])];

function bez2xy(v) = lim31(1, [v[0], v[1], 0]); // down xy projection
function bez2v(i, v) = lim31(1, bez2(i - 0.0001, v) - bez2(i, v)); // unit vector at i
function t(v) = [v[0], v[1], v[2]];
function rndR()=[rands(0,360,1)[0],rands(0,360,1)[1],rands(0,360,1)[0]];
function rndV()=[rands(-1,1,1)[0],rands(-1,1,1)[0],rands(-1,1,1)[0]];
function midpoint(start,end) = start + (end  - start )/2;
function rndc()=[rands(0,1,1)[0],rands(0,1,1)[0],rands(0,1,1)[0]];

  function rnd(a,b)=a+gauss(rands(0,1,1)[0])*(b-a);
  function srnd(a,b)=rands(a,b,1)[0];

function t(v) = [v[0], v[1], v[2]];
function y(v) = [v[0], 0, v[2]];

function vsharp(v) = [
  for(i = [0: 0.5: len(v) - 1]) v[floor(i)]
];

function un(v) = v / max(len3(v),0.000001) * 1;
function len3(v) = sqrt(pow(v[0], 2) + pow(v[1], 2) + pow(v[2], 2));
function pre(v,i)= i>0?         (v[i]-v[i-1]):[0,0,0,0];
function post(v,i)=i<len(v)-1?  (v[i+1]-v[i]):[0,0,0,0] ;
function SC3 (a)= let( b=clamp(a))(b * b * (3 - 2 * b));
function clamp (a,b=0,c=10)=min(max(a,b),c);
function gauss(x)=x+(x-SC3(x));
```