Good tutorial on making molds. Captive nuts, screws, smooth rod to prevent having to drill etc. Have fun...by kwhutto - Idaho RUG
Here is an interesting site for creating STL files. Kevinby kwhutto - Idaho RUG
Jim, I ordered everything pre-cut myself, made my first build faster. Maybe on a personal version I will cut everything myself. Yes, 4 motors are needed on the Mendel and the improved Z version of the Prusa. Don't forget end-stops. Min of 3 is required but if you want to control both min and max travel you will need a total of 6. My first build was opto (dont recommend, they blow easy dependingby kwhutto - Idaho RUG