This cap allows to mount a 20x20 extrusion to 45° degree to an other extrusion profile.
Stiffening your extrusion frame/construction.
You need a M5 screw for the front (flat pert of the cap).
And a M4 screw + a T-Nut (for the angled part of the cap)
For the assembly there has to be a M5 thread in the front side of the extrusion profile.
Also a hex wrench with a round head would make the assembly easier.

To print without supports, rotate it onto the flat angled surface. (see photos)
V2 has 4 noses for better centering.
The author marked this model as their own original creation.