Designed my own case for my 65mm quadcopter. Holds 12 batteries up to 70mm long. Fits the BetaFPV frame perfectly. Plenty of room if you have an FPV camera mounted on top. Takes a while to print but it fit together perfectly. The top holds tight enough that there is no need to secure it with anything but the friction between the top and bottom but still comes apart with a gentle tug.