This is a simple 3d printed frame for a single 18650 powered FPV drone. The frame weighs only 10g, overall weight including 18650 Li-Ion battery is around 97g. Flight times are +19min. I think it is feasible to get well over 20min as the temperature was around 5°C during the test, I stayed on the stock PIDs and the VTX was set to 100mW.
Get the free .stl on thingiverse: https://www.thingiverse.com/thing:4743497
0:00-0:13 3d printing the frame
0:14-0:37 evolution of the frame design
0:38-0:51 frame preparation and weight
0:52-1:07 overview of parts
1:08-1:32 preparing the flight controller
1:33-2:19 installing the flight controller
2:20-2:31 installing RX antennas
2:32-2:45 installing Caddx Ant
2:46-3:13 installing motors
3:14-4:03 weight and battery options
4:04-4:54 first flight with fail safe
4:55-6:18 +19min flight on 18650
6:19-7:20 8:30min flight on Lipo
http://on.fb.me/unboxingexperience