This jig allows drilling very precisely placed dowel holes for joining the edge of one part to the face of another. Dust collection is supported.
My blog explains more about this jig: http://www.theiling.de/cnc/date/2019-12-29.html.
This was printed in PET at 0.2mm layer height and 25% infill (there isn't much infill, though). PLA will probably work, too. ABS might shrink a bit, but may work, too, but I did not try.
There are two STL files: the one with '_2' in its name is rendered by OpenSCAD. The one without '_2' is rendered by Hob3l (https://github.com/moehriegitt/hob3l), presliced to 0.2mm layer height.
The author hasn't provided the model origin yet.