2040 - 90 degree Corner

I wanted a simple but sturdy small shelf for my Macbook, to be located on the wall behind a screen. Made this end stop for 2020 aluminum bars, for easy attachment to the wall.
This is also needed: https://www.thingiverse.com/thing:2499914

I also used https://www.thingiverse.com/thing:59398 for my shelf.

BOM:

M5 bolts and square nuts.
2x 20 cm - 2020 Aluminium extrusion
2x 24 cm - 2040 Aluminium extrusion
1x 20 cm - 2040 Aluminium extrusion