I made a simple router jig for rounding over corners.
I added different versions with a radius of 2.5mm, 5mm, 7.5mm, 10mm, 12.5mm, 15mm, 20mm, 25mm, 30mm and 35mm.
Just pick out the one you need.
It can be screwed to the workpiece or it can be fastend with a clamp like the Bessey GTR, the Festool FSZ or similar clamps that are normaly used to clamp down the tacks of track saws.
I have not printed out this model yet, but I wanted to share the files with you.
Have fun producing some sawdust! ;)