I really like the design of the printable Peon230 Quadcopter by Tech2C. I did a very simple powerboard for my quad (cut pcb > tape parts that have to stay > etch > solder) and needed a case. Maybe its usefull for one of you ;) I have my flight controller (CC3D) in a small case taped with strong double sided tape on top. Btw. Yes i sleeved my cables with paracord (used for case modding) You finde sleeving tutorials on youtube ;)The space for the PCB is 32 x 38 mm. So the PCB should be a bit smaller to fit in. I used tape on a plane copper pcb to protect the parts that had to stay and eched it. But if you don't have the tools to etch just cut the copper away on a milling machine or with a dremel. The shape is quiet easy to do ;)