Needed a larger compass to make circles and couldnt find one that was bigger than like 8 inches so i designed this one. The long parts go through the center piece (may need some sanding depending on your printing tolerances because its perfect off my printer)

Use an M4 or M5 hex for the lockdown and a wood screw for the end pointer. Put a flat drafting pencil in the one end or another marker. Set it to length and go make some circles!!!

This object was made in Tinkercad. Edit it online https://www.tinkercad.com/things/eVZSNNzcM0G