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...

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.


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 :
Part Map :