This versatile enclosure (I use it for my electronics projects) consists of 3 different parts: the top and bottom faces (identical, but easy to customize) the front, back and sides (also easy to modify) and the corner pieces. Everything is slotted together and fastened by 8 M5 countersunk screws. Sketchup files are included for various options.

You will need to print:
4x pillar corners (they're all identical)
2x Versa Faces (download the skp to edit in Sketchup)
4x side plates, scaled to your requirements.
Additionally, you need:
5x 8 M4 x 15mm Phillips head countersunk machine screws