Pragma C 5"

https://fpvcncdrone.com/ suggested me to make a cage for the Pragma, so, here it is : p

It's a time exclusiv, but I will share everything in open source during the summer 2025!

You can buy it there soon as a kit with screws and prints. ( Will update when it's up )

Notes :

• Same arms and key as the Pragma Analog / HD, but all plates are different
• This frame is made for people flying O3 and O4 without action camera, or with an analog setup with an onboard dvr recorder for example. I suggest looking into the original Pragma to save weight and if you wanna fly with an action camera : https://www.printables.com/model/1009540-pragma-5
• I have put all prints in one .step file in the download section, so you can work on them easily or make other prints for yourself

CARACTERISTICS

• DJI O4 : from 10° to 50° camera angle ( Props in view )
• DJI O3 : from 0° to 60° camera angle ( Props in view )
• 20x20mm or 30.5x30.5mm M3 central mount / 20x20 or 25.5x25.5 M2 rear mount
• Ø16mm motor mounting
• Ø221mm motor to motor ( 5.1" props max )
• 20mm stack heights in the center - 28mm height in the back
• No pressnuts under the stack = no risks of shorts, allowing you to mount the ESC low
• 2mm top plate - 2.5mm stack plate - 2.5mm bottom plate - 5.5mm arms
• Approx. 150g naked
• Maximum recommended battery size : 40x40x80mm
• Maximum square size of VTX with Ø5mm standoffs without TPU prints : 36x36mm

HARDWARE

• ( x18 ) M3x8mm ( Standoffs + Arms )
• ( x8 ) M3x12mm ( Arms + Cage )
• ( x4 ) M3x28mm Standoffs ( Body )
• ( x2 ) M3x25mm Standoffs ( Cage )
• ( x8 ) Pressnuts ( ONLY THESE ONES FOR THE ARMS )

For the traditional stack mounting : 

• ( x4 ) M3x20mm ( or M3x18mm ) Countersunk Screws
• ( x8 ) M3 Locknuts

For the recommended stack mounting :

• ( x4 ) M3x12mm ( or M3x10mm ) Countersunk Screws
• ( x4 ) M3 Low Profile Nuts
• ( x1 ) Short Ultra Mounting Kit

If you cut the frame through https://fpvcncdrone.com/ : no headaches, the hardware will be included.

FRAME DESIGN

The aluminium cage is strong and offers an adjustable camera mount, with a tilt from 0° to 60° for the DJI O3 camera and from 10° to 50° for the DJI O4 Pro Camera. 

There are notches to precisely set your camera angle. Prints are snug and don't move in a crash due to momentum, the camera should be hard to move with your bare hands.

The width of the inner cage is 25mm to allow you putting the camera further back and protected without having the cage in view.

If you like to experiment with different tilt during a session, it is really convenient !

Arms end are crown-shaped to protect motors bell uniformely from front and side impacts. They protect well enough with a must have TPU print, but still stay light to keep an overall agile feeling. They are the same as the Pragma Analog / HD

The armlocking system is taken from the famous Apex frame : pressnuts are inserted in the arms, so you don't have to worry about them sticking out under the ESC, risking shorts and damage when the frame flexes.

Arms are locked into place with a small gear-shaped key. This particular design allows carbon cutters to easily check if tolerances are well respected by inserting the key in one arm : it should't have any play.

Pressnuts needed are specific but pretty common, they can be found HERE.

The central stack has 20x20mm and 30.5x30.5mm M3 patterns

You cannot access the stack screws after the frame is assembled : make sure it's tightly screwed.

It's open source, so you can modify or make whatever you want with it ; ) 

Enjoy !