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Introducing the new alpinedrones X quadcopter, specifically designed as a relatively lightweight perfect frame for 4-inch props and 1306 or 1804/1806 motors. The built should be self-explanatory, taking only a few hours to complete. All components can be swapped to a new frame within minutes. The FPV mount doubles as a Mobius/Runcam/808 mount. My setup: PDB with integrated 12-volt and 5-volt regulators Naze32 running CF D4Rii Sn20a ESCs running blheli RCX1306 3100kv motors Machine FPV combo, extremely affordable but still effective Weight without battery: 198 grams AUW with a 1300mah 3S battery and an 808 cam: 342 grams UPDATE: October 12, 2015 - minor modifications to the body_v2.stl files UPDATE: April 1, 2016 - the fpv_v4 and v5 mounts are identical, only the ways of mounting the cam differ. I highly recommend a vtx with an antenna cable. (updated on April 19, 2016) EDIT: Files deleted. UPDATE: February 22, 2016 - flight-tested 5-inch prototype of the new design FINAL UPDATE: The last four-inch and five-inch designs have been tested, proving to work very well, so not much left to change. Two new files have been uploaded: a new FPV mount for board cameras and a new top plate. These two attach to each other using two rapstraps, working significantly better than zipties. Print Settings: Printer Brand: RepRap Printer: Makerfarm Prusa i3v Rafts: No Supports: No Infill: 70-80% Notes: I recommend printing with ABS material for this project. For optimal results, use three to five shells and an infill percentage of 70-80% for the body, reducing infill in the top part. The FPV mount should be printed on its side using a soft material, such as Soft PLA, for best results.