Here are some detailed instructions on how to build a FLAG, with lots of photos. These instructions are for making one using a Cricut hobby cutting machine, and there are links to all of the Cricut files in the instructions.  A hobby cutter is easiest, but the patterns can also be cut out with a sharp knife and patience. 

FLAG Instructions.pdf (hackaday.io)

This is a demonstration design, intended to be as easy as possible to make and not requiring any 3D printed parts.  It is not intended for extended use or high performance.