A base plate to help follow a guide you can attach to your Ryobi RTR18 Trim router using the same screws that attach the stock base.

The bit in the picture is a 6.35mm straight cutter.

Outer dimension of guide ring is 17mm.

With a 6.35mm bit, the gap to the edge of the guide is 5.325mm. This the number you need to account for when creating templates.

No special printing settings required. Although better to print with higher strength as you dont want it to be bendy.