This is a set of basic wall mount corner brackets to mount a standard LP album cover to a wall. If you just want to print a single set you only need the file LP Cover Holder Set.3mf. I included the 4 pieces as additional separate files for convenience. Print settings below.
Layer Height: 0.20mm
Material: PLA/PETG
Perimeters: 4
Enabled Detect Thin Walls (this was precautionary only).
In addition to the above 3d printed files you will need 4 countersunk screws and an appropriate anchor method (drill into studs, drywall anchors, etc.)
The author hasn't provided the model origin yet.