Photo frame A4

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](http://www.thingiverse.com/thing:26770).