I was reading about YASFF opensource SFF case build project where he 3D prints the corners into which the sides slide in and the top and bottom is screwed down. Here is a picture of the 3D printed corners My idea is a similar cross section to the YASFF corners (remove the void and optimise for extrusion) sold in set length that allows the consumer to cut to their own lengths to suit their own case design. After looking at the experts adding their expertise in threads like the laser cutting thread, I wondered if anyone might have experience with Aluminium extrusion moulding? looking at bunnings for mass produced mouldings they seem to be as low as $10 a meter. i'm guessing the Die Moulds are expensive to make, though one informational site i was looking at quoted as low as $500. anyone with experience able to give a better estimate on cost and minimum batch size?