A wall-hangable A4-sized photo frame, built from 10 pieces (corners, vertical frame and 2 horizontal frame elements). Also comes with hooks for wall-hanging.
There are plans to improve the aesthetic side, remove the need for support structure and provide other sizes too. But no deadlines!
Inspired by the post-it frame.

Print 4 corners, and 2 of each frame element (or less, if you want a smaller frame). Turn on support structure in your printer.
The hooks were printed with flexible PLA so that they bend enough to be inserted in the holes behind the frame. Print 2 of them and tie a string between, then hang to a wall hook.