This is a customizable circle cutting jig for routers (specifically for the Makita RT0700C, but the customizer should allow to generate different base plates).
Default setting is for a 12mm cutting bit.
You need 2x M3 screws and 1x M3 nut and washer for the inlay - one screw is used as the hole center, the other is used to fix the inlay on the router base. For better comfort, use a wing nut or print a thumbscrew attachment like this:
The OpenSCAD file can additionally generate:
- a blank router base plate
- a "simple" circle cutter (no inlay, just fixed center holes)
- a hole template to check if mounting holes are correctly positioned