DXU - Dual Extrusion Upgrade for UM2+

## FEATURE - This project upgrades Ultimaker 2+ to a reliable dual extrusion printer. - The approach is based on the great effort everyone put into Mark2 for Ultimaker 2 and Ultimaker 3.  - The print head holds two hot ends, which are originally to be installed on standard UM2 head for 1.75 filament. The right nozzle move up and down nozzle swapping.  - This compact dual print head can achieve single extrusion print area of 220x223x205, and dual extrusion print area of 184x223x200. ## VIDEO: https://www.youtube.com/watch?v=t5hBJdgy24A ## FILES AND INSTRUCTIONS: https://github.com/yyh1002/DXU ## CREDITS: - Lever lifting mechanism is inspired by Ultimaker 3. - The firmware is modified based on Mark2 version of Tinkergnome firmware by tinkergnome. - CURA profiles are modified based on the Mark2 profiles by tinkergnome and foehnsturm​​​​​​​. - Used Mark2Tweaks plugin for CURA by Krys Lawrence.