Lego Mindstorm Part Builder

Based on OpenJsCad

Building your EV3 robot, but can't find the right part to hold that sensor at the position you want? Need to simplify a messy combination of parts into one single part? This page will help you design your own custom part for 3D printing.

This part builder is only meant for simple parts. For more complicated designs, use a (free) 3D modeller such as...

SketchUp
Tinkercad
FreeCAD
OpenJSCAD.org (Text based)
OpenSCAD (Text based)

WARNING! Anything you enter will be lost as soon as this page is reloaded. Copy and paste whatever you want to save onto your own computer.

Design

Every 3D printer is slightly different. Before printing a large design, print a small test piece and adjust "Hole Radius" and "Hole Step Radius" until it fits.

Hole Diameter :
Hole Step Diameter :
Hole Step Depth
Part Map :	# Lines beginning with a "#" are ignored # Every character (case sensitive!) represents one block. # Click the "?" on the left for details. YZX 00B # Blank lines (...like the one above) indicates a new Z level. 000 00y

// Feel free to mess around with this.
// If anything breaks, just reload the page and it'll return to normal.

var holeRadius = holeDiameter/2;
var holeStepRadius = holeStepDiameter/2;
var base = 4;
var resolution = 32;
var axleWidth = 1.8;
var axleLength = 4.8;
var axleChamfer = 0.8;

var VALID_BLOCKS = 'BXYZxyz';

// Uncomment the next line to allow pin blocks (experimental).
//var VALID_BLOCKS = 'BXYZxyzabc';

var pinRadius = 2.1;
var pinStepRadius = 2.4;
var pinStepDepth = 0.5;

function main() {
  var rows = partMap.split(/\r?\n/);
  var slices = [];
  var slice = [];

for (var i=0; i<rows.length; i++) {
    var row = rows[i].replace(/\s*$/,"");

if (row.length == 0) {
      slices.push(slice);
      slice = [];
    } else {
      row = row.replace(/#.*$/,"");
      if (row.length != 0) {
        slice.push(row);
      }
    }
  }
  slices.push(slice);

for (var z=0; z<slices.length; z++) {
    var slice = slices[z];
    for (var y=0; y<slice.length; y++) {
      var row = slice[y];
      for (var x=0; x<row.length; x++) {
        if (row[x] == '#') {
          break;
        } else if (VALID_BLOCKS.indexOf(row[x]) == -1) {
          continue;
        }

if (typeof part == 'undefined') {
          var part = placeBlock(row[x], [y,x,z])
        } else {
          part = part.union(placeBlock(row[x], [y,x,z]));
        }
      }
    }
  }

return part;
}

var translation = [
    position[0] * base * 2,
    position[1] * base * 2,
    position[2] * base * 2
  ];
  return block.translate(translation);
}

return body
    .union(pinStep1)
    .union(pinStep2)
    .subtract(split1)
    .subtract(split2);
}

return body
    .subtract(hole)
    .subtract(holeStep1)
    .subtract(holeStep2);
}

return body
    .subtract(axleHole1)
    .subtract(axleHole2)
    .subtract(chamfer1)
    .subtract(chamfer2)
    .subtract(chamfer3)
    .subtract(chamfer4);
}

function solidBlock() {
  return CSG.cube({
    center: [0, 0, 0],
    radius: [base, base, base]
  });
}