This is a customizable frame for brushed coreless motor micro quadcopters. I started designing this when the frame on my Blade Nano QX started getting beat up. So far, the mounting area in the center is designed to hold the Blade Nano QX's flight controller.
I have ordered a Micro Scisky controller, and I will be adjusting the model to accommodate that when it arrives.
I flown this frame with 6x15mm motors quite a bit. It handles great, but I haven't printed a 6x15mm motor frame with prop guards yet. I'm a terrible pilot, and I bump into things a lot, so I'm going to be using the Nano frame until it finally gives out (again!).
The first frames I printed were in ABS, but I've since upgraded to Taulman 910 nylon. The frame is more rigid in ABS, but it is much more fragile--you'll probably want to bump up the "Motor Mount Thickness" quite a bit if you're not using nylon.
The photo with the prop guards has 8.5x20mm motors. I was hoping that the Blade Nano QX flight controller could handle them, but it can't. The copter shoots up to the ceiling at 4% throttle--it is completely unusable.
The Micro Scisky flight controller will probably be in transit for a few weeks, so I figured I'd get this up on Thingiverse while I wait just in case anyone is in need of a frame for their Blade Nano QX!