Round corner Jig for Router

This is a jig to be use with a router and the flush trim bit. I created an arc from a 15 or 20mm radius circle on the corner of a board. 

The jig can be handheld or you can use clamp to secure it to the piece of wood.

It has positive tabs to register the side of the board.

I printed mine in PLA with a .6mm nozzle with 4 perimeters to add strength. But I doubt this is mandatory.