Instead of printing the whole model, you just do a part of the shell. In your slicer change the settings of: - Bottom and top thickness to: 0 [mm] It does not print a bottom and a cap. - Infill or Fill density: 0 [%] You want it hollow, don't you? - Shell thickness: 0.4 [mm] It depends on your nozzle size (mine is 0.4).See also: - http://www.thingiverse.com/thing:13505/#instructions - http://blog.prdcz.com/3D/2014/07/22/stream-print/That's it! Have fun and tell me, if it worked. :)