Special templates for using with router to make round corners. Radius 5mm and 10mm are outs (in one template), 20, 30 and 40 - outs and inners.

Print out the two parts, glue them together and fine-tune the working edges if necessary.

Source

The source is here.

How to use my configurable models in OnShape

To get an access to the thing source you'll need an account in OnShape. It can be free, so made it for yourself.

Go to the document by the specified link.

Go to the tab "print setup". There should be a few configurable values in the upper-left corner. Change what you need. Wait while rendering finished then export parts from this tab (see in the bottom-left corner). They already oriented in the best printing position.

Also some configuration options can be in other tabs. Check them if you wanted.