Mostly Printed CNC - 4 Head Printer
https://www.v1engineering.com/
http://www.thingiverse.com/thing:724999
Sorry My phone video camera isn't cooperating, super blurry.
The Mullaly monster was inspired by Jeff the Genius, he would not let me dismiss the idea and helped me work through the tough spots.
Apart from the standard MPCNC I added another ramps set, one more stepper for the Z-axis, and more printed parts. The only new part was a bar clamp I made.
1 Ramps drove the whole machine, 2 steppers on each axis, 4 on the single extruder driver (drv8825)! Print fans were all run off the same board. The extruder temps are individually controlled with repatier-host. Each ramps board was flashed with a dual head marlin and set the 3 other extruders to match the print temp. When all 4 are at temp, Press start!