Print 2 Caps and the two parts of the threaded tube connector to turn any 2 plastic tubes into a box.
These files fit 1 zoll tubes (approx. 32mm OD 28mm ID)
can be customized -
threaded connector here: http://3ddoctors.net/templates/tubing/tubethread.html
and the end caps here:
http://3ddoctors.net/templates/tubing/tubeendcap.html
and for other cool stuff in that website: www.3ddoctors.net