This thing is a case to protect the open source hardware wireless sensor node INGA. http://www.ibr.cs.tu-bs.de/projects/inga/It uses the friction between the PCB and case to assemble the case without the need for screws, straps, etc.The text requires Write.scad from http://www.thingiverse.com/thing:161931) Slice/skein with one perimeter (no additional) 2) Make sure cooling is enabled or print speed reduced so the walls don't wobble 3) After printing sand down the ooze/cruft, especially from the PCB guide slot. Don't force the PCB in or you'll have a hard time getting it out again. 4) You might need to sand off the guide stubs for the two parts to fit. 5) Assemble and enjoy a protected sensor node!