FYSETC's latest BIG DIPPER 3d pirnter motherboard is equivalent to a fusion of DUET3 mini5+ and mini2+. It has 7-channel TMC2209 stepper motor driver, which can directly run Reprap Firmware, especially suitable for projects that require 7 stepper motors, such as VORON series, Annex Engineering K3, multi-Z axis models, double X models, etc.