This is a split keyboard based on technomancy's Atreus. Info about the Atreus can be found here: https://atreus.technomancy.us/

The keyboard uses firmware built by reddit user _spindle which is a branch of TMK and can be found here: https://github.com/ahtn/tmk_keyboard/tree/master/keyboard/split_keyboard

Completed pictures and build pictures can be found here: https://www.reddit.com/r/MechanicalKeyboards/comments/4q0g4e/fully_3d_printed_split_atreus/

The hardware used is as follows:

42 Cherry style or Matias switches 42 1N4148 Diodes 2 Arduino Pro Micros (mine are from Ebay) 4 USB Micro B Breakout Boards (mine are from Adafruit) 3 USB Micro B male connectors 1 USB A male connector 4 6mm M2 standoffs 8 M2 screws to fasten the USB breakouts to the standoffs. My screws were slightly too long so I used a nut as a washer 16 16mm M2 screws to fasten the plate to the case 16 M2 nuts to fasten the case to the plate 30AWG color coded wire 30AWG magnet wire 1 3D Printed left plate 1 3D Printed left case 1 3D Printed right plate 1 3D Printed right case 40 1u keycaps (I used DSA) 2 1.5u keycaps

NOTE: The housing space for the Pro Micro is inspired by this thing http://www.thingiverse.com/thing:320421 It is intended for some small cuts to be made to free the tab that holds the controller in place with a snap fit.