Herringbone Planetary Gear Mount for Busy Board

This is a simple spacer to screw the inner gear of the Herringbone Planetary Gear to a busy board. It guides the screw through the centre and also acts as a spacer so the gear doesn't rub on the board. The mount is designed for use with a 4mm diameter screw but also works with smaller ones (but make sure the head is large enough, or use a washer). Printed in PLA, 0.4mm nozzle, 0.2mm layer height, no supports.