The Afromini version of the Naze32 is extremely compact. It is also very hard to mount in a standard 50 mm standard controller stack. This design is for a mounting plate that provides that ability. The controller is mounted to the holder using a few zipties. The holder also has place for mounting a short led strip in front of and behind the controller. There is a version without the LED mount bars that can be found here: http://www.thingiverse.com/thing:682011