Parametric Microdrone Replacement Frame

I had to change the dimensions of [Thing 1896702](http://www.thingiverse.com/thing:1896702) slightly so that the SANROCK mainboard fits in between the propellor protectors. Since the OpenSCAD source was never released, I wrote my own.

The frame of this version weights ca. 4g and more weight can be saved if the propellor protectors are printed with a single shell. It is pretty generic and should fit many popular tiny drones, e.g. the SANROCK GD65A, the Blade Inductrix 65mm, the Eachine E010 and many Tiny Whoop 65mm models.

Printed with 0.2mm layer height with a 0.45mm nozzle without supports.