20mm corner bracket
thingiverse
A person's expectation is piqued because they didn't stumble upon an existing iteration like this one yet, designed to pair well with a 20mm extruded setup paired up with an M5-sized button-head screw.
Download Model from thingiverse
With this file you will be able to print 20mm corner bracket with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on 20mm corner bracket.