Printrbot Nozzle Holder (for Ubis Ceramic 11mm outer diameter nozzles)
After I mounted my printrbot with the screwdown feet (thanks to Matt448 for sharing) http://www.thingiverse.com/thing:724909
I had a few spare nozzles i wanted to mount to the platform so I wouldn't loose them easily. Very basic stuff but useful to me perhaps useful to you.