Rapman 3.1 Dual Head Conversion to RAMPS 1.4 Marlin

My Rapman printer was dying so I used the Arduino and RAMPS 1.4 setup to convert the machine. I also swapped out the extruders using stephenmhall Bowden Dual Head Extruder mount and arms along with my own parts found here. I've been running it for over 100 hours with a few minor tweaks. I did insert 2 small copper tubes in Stephen's extruder frame to avoid wear. All parts here are up-to-date. Printer now uses 1.75mm filament, larger print area due to closer extruders, heated bed eliminates the n