An OpenSCAD script to generate basic shapes to represent common bearing and stepper motor sizes used in RepRaps, in your designs. I wanted to test a design for an extruder in software to see if things would fit. So I had a go at making modules for the things I would be using repeatedly and this basic script is the result. include the script include and then call the predefined shapes when you need them. bearing624(); bearingLM8UU(); bearing626(); bearing608(); nema14(); nema17(); The models are pretty basic and parametric so it should be pretty easy to add any others you might need.