4040 Extrusion End Hinge

Remix of https://www.thingiverse.com/thing:5164914.

Hinge to attach a 4040 profile with 90 degrees to another 4040 or 8040 (8020) profile. Using it for my keyboard on a horizontal profile which is attached to a standing profile.

Also made some minor design changes to be able to print it laying down instead of standing up, to minimize the need for supports as I print it with PETG which is horrible with supports.