Print two long pieces, two short pieces, four corner pieces, and four lock pieces.<br>
The four lock pieces are inserted in the sockets in the four corner pieces.<br>
All the pieces should fit together firmly but, a bit of glue will be
required to keep them together. Note: The inside corner of the corner
piece has a thin piece of breakaway support that has to be removed.
Creative Commons Attribution Noncommercial Share Alike