Duet3 6HC motherboard 1. Duet 3 v1.0. The bed heater channel is specifically designed for high current (18A). Dual extruders on the main board, up to 5 more extruders on the expansion board. Five Arms Side Brush for Xiaomi Mi Robot Roborock S5max s50 S51 S55 S5 S6 S5 E35.