Ever needed to tap openbuilds or similar aluminum extrusion and wanted it to be easier? Print the jig(s) you need, use alcohol on a spiral flute (not spiral tip) tap, and chuck it in a drill with a clutch, with the clutch set light. You can probably tap all the depth you need in a single pass without reversing to break the chip, but might depend on your tap. I recommend polished flute taps.
The smallest jig works for 2020, 2040, 2060, or 2080; the large square for 4040, and the C-shaped one for C-beam. The large parts of the holes are for the chips that the spiral flute taps eject out the top.
Made with the realthunder fork of FreeCAD.