Summary

A mini miter box for cutting quarter round moulding and such. Slide the moulding inside and make a perfect cut. The cutout (hole) is physically designed to be 17mm x 17mm with a 5mm chamfer/offset for the diagonal. Slits are at 45 and 90 degrees and are 1.5mm wide. Be sure to scale model for a snug fit and best cut.

If you have 5/8"quarter round moulding then scale up by 6%. If you have 3/4" quarter round moulding then scale up by 35%. This will get the you the required clearance in the cutout. See above for cutout dimensions, do some trigonometry, compensate for any shrinkage, and scale accordingly. Cheers.

Recommended Print Settings for 0.4mm nozzle:
-0.2mm resolution
-25% infill
-1.2mm walls
-PETG, ABS, PLA are all OK.
-No supports needed if printed bottom side down