This is a remix of Helasius drillguide - https://www.thingiverse.com/thing:4839621 However, I needed it to be able to drill on a square corner. As per the original description, it fits sizes 3, 4, 5, 6, 8, and 10, with holes at 90º and 45º. Now also the possibility to drill on an edge at 90 degrees. The ribs indicate the drilling position on each hole.
V1 has a 5 mm groove for corners, while v2 has a 10 mm groove.
The author remixed this model.