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Spindle

Rough design

The plan is to use a fifth identical BLDC gimbal motor as the PCB milling spindle. I'm going to 3D print a collet that fits milling bits with a 1/8th inch shaft diameter and then cross my fingers:

Collet

Spindle

Spindle with controller

The final version of the board will save space by using the SAMD21 instead of the Xiao:

Xiao and SAMD21