A big kinetic art project for your empty 2 by 4 meters wall. :)Update: Movie added http://www.youtube.com/watch?v=EIUwBxDOi_w Update: Added the electronics box (after a small redesign). Update: Added the Tray-List.xlsx if you want to know print times, filament usage and colors used for each tray.This is another DIY kinetic art project. I don't have a full instruction ready for you. It's all in your imagination and fingers. :)Ball Bearings used: Amount: Size: Name: 11 2x6x3 Mini ball bearing 692Z ABEC1 40 3x8x4 Mini ball bearing 693Z 2Z ABEC1 21 5x16x5 Mini ball bearing 625Z 2Z 53 6x15x5 Mini ball bearing 696Z 2ZRead the full story here: http://www.snille.net/projects/project-3Inspiration sources on Thingiverse... Universal joint - http://www.thingiverse.com/thing:14335 Spring joint - http://www.thingiverse.com/thing:5439 Bevel gear - http://www.thingiverse.com/thing:3575Everything is printed on a eMaker Huxley (beta machine). Total project print time: 91h Total meters of 1.75mm filament: 320.39 It's about 120 printed parts in this project. Nozzle temp: 160c Bed temp: 70cAll printed things are printed with excellent PLA from Supply3DPLA.com.