printer enclosure corner bracket

printed this with PLA+ although petg may be stronger and a better choice. corner brackets for a printer enclosure using 16mm aluminium tube or u section.

Added 3 more files, i have my frame sitting over a 600x600 tile so i have include the bracket with a standoff on the bottom. i also put a left and right bracket with standoff and 20mm offset for bottom rail, i have ducts that run from the printer under that 20mm gap for cool air to the psu and the main board. then i cut anclosure cover around the duct