Foldable Nano Quadcopter FNQ220 (parametric OpenSCAD)

UPDATE 04-APR-2018:
REPLACED by Version 2 - see Thingiverse object "FNQ220 V2, object #2850976"

UPDATE 23-APR-2016 (see openscad file V.24):
- Bugfix: Boom flight position stoppers adapt to QUAD_W > 50°
- Feature: Stoppers with cylindrical filled frame geometry (StopperFill)

UPDATE 04-MAR-2016 (see openscad file V.23):
- Bugfix: boom slots are symmetric now, even with Quad_W > 45°
- Additional "top cover" added for customizer selection ("cov") e.g. for GPS
- Some parameters fine