I needed to find a place for my Pi, so I took the base of the spool holder and fused in a Raspberry Pi (B+/2) sleeve to make an easy to use, removable home for the Raspberry Pi. I use this with OctoPrint (and occasionally AstroPrint)
I printed with 40% infill and 3 perimeters, but I think six might be better.
Included the endocarp file from the original sleeve at http://www.thingiverse.com/thing:681899
Print and go! Slides on just like the spool holder, with the ports facing away from the printer.