1. Intuitive and simplest assembly, using the minimum amount of screws and nuts on every pieces. And once again, it's a delta style printer, you just have to repeat 2 other times the assembly of one axis. 2. Simple electronic, we choose the Teensylu because it's simple and efficient, the µDelta is not suitable for 2 hotends so we have all we need on this board. We prefer to avoid any on-board stepper driver solution because of democratization of 3D printer(so no technical people can easily repair using spare parts) 3. Dedicated plugin on Repetier-Host with fully software calibration.