The Hobbyking X900 Tricopter is a very great frame, itis a pity the motor mounts are such poor quality they pretty much constantly break in case you place any substantial load on them (bigger motors, or a slight crash).
All these are replacement motor. I assembled just considering it functioned so nicely, and the back mount, replaced them all.
Coming shortly: Multicopter Legs
Prints totally on my Up / Afinia printer, but should operate almost everywhere. I print these with a 0.20 millimeters resolution.