Two-part keyed picture frame mount

Max depth: 30mm Screw size: 5mm I was looking for some way to mount a picture frame that didn't have a solid mount on its back, I found almost what I needed from this Printables model: https://www.printables.com/model/349097-picture-frame-corner-mount however I had to modify it to be 30mm deep and that would have required very long screws. This design inspired mine so I created a two-part design where the screw could go through the one part and then it can key into the part that holds the frame - this method allowed me to print the part without any overhangs and need for supports. This was a really quick design and the key slot is a bit too tight, but it does work if you softly hammer the parts together. I've included the STEP file for anyone that want to modify the size and possibly fix the fitment issue.