Knob for M3 nut

Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4396578.

This is knob which accepts an M3 nut and screw. Overall height is 10mm and diameter 22mm. The hexagonal recess for the nut is slightly tapered to help retain the nut. Made this to replace the wingnuts on a cheap printer.