This is a "true X 250" frame design (despite it resembling a "H" lol), meaning the motors are spaced evenly apart in ALL directions which offers a higher degree of stability during all angles of flight.

this design uses a minimalistic printed parts approach so as to better utilize the rugged durability and strength that Carbon fibre brings to the table without having to fully compromise on cosmetic appeal and practicality.

All delicate electronics are sandwiched inside between two very strong pure 3k Carbon Fibre 2mm plates (top&bottom) and the arms are 14mm OD Carbon Fibre tubes, all wiring is routed through the interior, including the motor wiring which passes through the arm tubes, to accomplish this I have chose to forgo the use of 4 separate esc in favour of a 4in1 esc stacked with a 35x35 FC at the frame COG (which again assists the FC in maintaining the frames stability)

I have included "exploded" images of the frame which makes understanding its construction better than myself trying to explain, I also included "template" prints that assist with the cutting of the various Carbon Fibre plate parts (these are set to print at 0.5mm thickness and can be taped/hotglued to the Carbon plate and used to cut round and locate drilling points for fixings and access holes then removed and disposed of when your done.

You can opt to use whatever Hardware you chose or prefer as their should be ample room inside the frame (using 4x esc upto 12a sized would even be possible with careful cable routing)

Setup used in my own current frame:-

FC- CC3d v2.0 (no case)
ESC- Racerstar 20amp 4in1
MOTORS - Racerstar 2305 2600kv
CAM - Eachine 1000tvl
VTX- Eachine TX801
RX- TGY-iA6C
PROPS - DAL 5040 Tri & Racerstar 5051 Tri (the frame does allow for the use of 6" props also though)

AUW (all up weight) with a 1800mah 4s(pretty chunky for a 250 frame) is 480g, using a smaller more racing spec'd lipo see's it around the 390-400g mark.

flight testing has confirmed the true-X stability approach, It sits in the air like its been glue'd there and responds incredible well and predictably during heavy acro flying, I'm very pleased with the results.

hope everyone likes her as much as I am and have a safe and happy flying experience.

ps,

I almost forgot....

Carbon Fibre plate came from....
https://www.banggood.com/3K-2003002mm-Plain-Weave-Carbon-Fiber-Plate-Panel-Sheet-p-1085797.html?rmmds=myorder

Carbon Fibre tube came from.....
https://hobbyking.com/en_us/carbon-fiber-round-tubes-14-12-500mm.html

geeetech i3 pro b

No

No

0.3

40%

Ive used ABS in this design but intend to recreate it using Petg in the near future, though the ABS parts have proven more than strong enough I just wish to see if the Petg offers further improvement.

dont be tempted to scrimp on infill or lower it to try and save print run time, there are very few printed parts to this frame but all of them are pretty fundemental in maintaining the frames great strength and durability, lowering infill wont save any significent amount of time or weight and will only result in weakening the parts.