Horus X10S Express - 21700/20700 Li-Ion Battery Tray Adapter by Marco67
Printed for John "Burgerman" Williamson, Wheelchair Driver forum
The problem with this design is the protruding bosses underneath which lifts the holder off the PCB. A better design would be to remove the bosses to make the base flat, increase the hole size from 3.2mm to 6mm, Then separately print 4 spacers with 8.5mm OD and 3.2mm ID hole and a 5.9mm boss on top - like this:
Finally use a standard 7mm OD washer under the head of the M3 screw to lock the spacer in place.