Introducing the new alpinedrones X quadcopter. It's supposed to be a relatively light weight perfect X frame for 4" props and 1306 or 1804/1806 motors.
The built should be self-explanatory and done in a few hours. All components can be swapped to a new frame within minutes.
The FPV mount doubles as Mobuis/Runcam/808 mount.
PDB with integrated 12V and 5V regulators
Naze32 running CF
sn20a ESCs running blheli
RCX1306 3100kv motors
eachine fpv combo (super cheap, but ok)
weight without battery: 198g
AUW with 1300mah 3S battery and 808 cam: 342g
UPDATE: 10.12.15: body_v2.stl minor modifications
UPDATE: 4.1.16: fpv_v4 and v5. identical mounts, just different ways to mount the cam. I recommend a vtx with an antenna cable. (edit 19.4.16: files deleted)
UPDATE: 22.2.16: 192 - 5" version. flight tested 5" prototype
(supposedly) FINAL UPDATE 19.4.: the last 4" and the 5" design seem to work really well, so there's not much left to change. two new files: a new fpv mount for board cameras and a new top plate. these two attach to each other with two rapstraps. should work much better than zipties.
I use ABS most of the time and recommend it for this print. Use 3-5 shells and 70-80%infill for the body and a bit less infill for the top part.
The FPV mount is printed lying on a side from a soft material - I used Soft PLA for my print.