Hammer nut for 20x20 extrusion.
thingiverse
This nuts can be inserted in the T-slot of a 20x20 extrusion at any point, when twisted they lock in place. The hole should be just right for a M3 screw to thread itself firmly, it shouldn't be necessary to tap the hole to cut threads. Instructions Should be printed in 0.25 or less layer thickness.
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