This Eggbot has mechanical Parts, that are mostly made of Fischer Technik (FT). Fischer Technik is a typical german Toy. See http://www.fischertechnik.de/en/desktopdefault.aspx I like it very much, because one can design quickly mechanics or little machines like this one.This Eggbot is a drivat of SphereBot by Zaggo http://www.thingiverse.com/thing:7656 All the Electronics and Software are the same, except of the reference sensor. Still now i easily dont use it.Hopefully the pictures will explain what to do, but feel free to contact me for furhter informations. I had only some problems to solve the machanical Interfaces to the Steppermotors. FT use axes with a diameter of 4mm, but the Stepper have 5mm or M5. Sure you can drill it with 5mm, but i dont like to "damage" my FT-parts. Also the NEMA-Size is not typical for FT. So I made some plates that are "compatible". For this it is good to use an cnc.