This Duet 3 tool board 1LC v1.2 is a CAN-FD expansion board for the Duet 3 motherboard designed to provide full control over a direct drive extruder. The mounting holes and connector locations correspond to an E3D Hemera, but can also be used with other direct drive extruders with suitable brackets.
The stepper motor, heater, temperature sensor, fans and optional Z-probe and filament sensor are connected to the Duet 3 toolboard, leaving only CAN-FD and power cables to run back to the Duet 3 mainboard.
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the extensive documentation (external).