Why 3D Printing and DJI O4 Are a Perfect Match
The DJI O4 Air Unit is the most advanced FPV video system on the market, but out of the box, mounting it to your custom-built quadcopter can be a challenge. Every frame has different geometry, every pilot has different preferences for camera angle and antenna placement. This is where 3D printing shines — you can design and print custom mounts, guards, and accessories that perfectly fit your specific build. Here are the top 10 must-print 3D upgrades for DJI O4 Air Unit owners.
1. Adjustable Camera Mount
A rigid TPU camera mount with adjustable angle (15-55 degrees) allows you to experiment with camera tilt without reprinting. Designs incorporating M3 heat-set inserts provide rock-solid locking at your chosen angle. Look for mounts that protect the camera lens with a recessed design and include a slot for an ND filter.
2. Antenna Strain Relief and Holder
The O4 Air Unit’s dual antennas are vulnerable to crash damage where they exit the VTX. A TPU strain relief clip that snaps onto the antenna connectors and routes cables cleanly along the frame prevents torn U.FL connectors — the most common and frustrating O4 failure mode.
3. VTX Isolation Mount
The O4 Air Unit generates significant heat. A PETG or TPU mount that suspends the VTX above the frame with an air gap improves cooling and provides vibration isolation. Include mounting slots for zip ties or M2 screws. Some designs incorporate a small heatsink pocket for the VTX’s thermal pad.
4. Lens Protector with ND Filter Slot
A snap-on TPU lens protector with an integrated slot for ND filters protects your camera during transport and crashes while allowing quick filter swaps in the field. The best designs use a friction-fit mechanism that holds the filter securely without adhesives.
5. SMA Antenna Mount Adapter
For pilots converting from older analog or Vista systems, an SMA adapter mount lets you use existing SMA antennas with the O4’s U.FL connectors. Print in PETG for rigidity and include a 90-degree routing channel for clean antenna placement.
6. O4 to 20×20 / 30.5×30.5 Stack Adapter
Many frames use standard stack mounting patterns that do not match the O4’s 25.5×25.5 mm mounting holes. A TPU adapter plate bridges these patterns, letting you mount the O4 securely in any frame. Include vibration-dampening standoffs for cleaner video.
7. SD Card Access Door
If your O4 is buried deep in the frame, a TPU access panel with a hinged door allows SD card swaps without disassembling the quad. This is especially valuable for pilots who record onboard DVR for flight review or content creation.
8. Integrated Buzzer and GPS Mount
A multi-function TPU mount that holds the O4 antenna, a buzzer, and a GPS module in a single printed part reduces weight and cleans up the build. Designs that position the GPS module above all other components ensure best satellite reception.
9. ND Filter Storage Case
DJI O4 ND filters are small and easy to lose. A compact PLA storage case with individual slots for ND4, ND8, ND16, and ND32 filters keeps them organized in your field bag. Print with a snap-fit lid for secure closure.
10. Arm Guard with O4 Camera Protection
A combined TPU arm guard that extends forward to create a protective cage around the O4 camera lens prevents direct impacts from branches, gates, and concrete. The guard should be designed to break away on severe impact rather than transferring force to the camera.
All these designs are available for free on Printables, Thingiverse, and MakerWorld. With a well-tuned TPU profile on your 3D printer, you can print all ten upgrades in an afternoon for less than $5 in material cost — far cheaper than replacing a damaged O4 Air Unit.
What is your favorite 3D printed upgrade for the DJI O4? Share your must-have print below!