Creality CR-10 Raspberry Pi Sidebar with relay

this is a remix from https://www.thingiverse.com/thing:2643432
adapted for octoprint :
- support for a 2 relay board
- power outlet
- no SDcard holder
- a hole for plier
- a hole for knife
- an octoprint logo
- case for raspberry pi 3

with the relay you can power ON/OFF printer and LED light from octoprint

added 3 formats from Fusion 360 : OBJ , DWG and DXF