Thingiverse Design: http://www.thingiverse.com/thing:263668

• 8mm
• Length, for a simple egg-sized object: 200mm should be enough. 300mm is definitely too much…

Custom electronics, with a Teensy2.0 board and two PololuA4988

A word of warning, there's a small mistake on the PCB, the GND trace that powers the Pololu should be way larger…

Arduino sketch, adapted from: https://github.com/thunderbug1/Spherebot-Host-GUI

Qt based app, based on: https://github.com/thunderbug1/Spherebot-Host-GUI but completely redesigned. Available here: sphereui-master.zip

• http://www.thingiverse.com/thing:263668
• http://www.thingiverse.com/thing:20398/#instructions
• http://www.welcomerobotoverlords.com/
• http://www.open-electronics.org/spherebot-reloaded-customize-your-xmas/
• http://webhome.csc.uvic.ca/~mcheng/samples/eggbot/usb.html
• https://github.com/cocktailyogi/EggDuino/