Just a quick circle jig for handheld routers with a puzzle piece connection to allow for future revisions and fit within a Prusa I3 build plate. F3D file included.
It's intended for a 1/2" router bit. If you use a 1/4" bit, just go 1/4" larger on the hole size.
It rides on a 3/4" bushing so the router itself doesn't have to rotate.
Peg size is 1/4".
The author hasn't provided the model origin yet.