TPU (thermoplastic polyurethane) parts are the difference between a drone that breaks on every crash and one that bounces back ready to fly. While carbon fiber provides the rigid skeleton, TPU provides the flexible armor — absorbing impact energy, protecting delicate electronics, and mounting accessories securely. This guide covers the complete catalog of 3D printed TPU parts every FPV pilot should have, from bumpers and skids to GoPro mounts and GPS holders.
1. Why Print Your Own TPU Parts?
Commercial TPU parts for popular frames cost $5-15 each. Printing your own costs pennies in filament and allows complete customization. A single spool of 95A TPU ($25) can produce hundreds of parts. Beyond cost savings, printing your own means you can iterate — make the camera angle 5 degrees steeper, add an ND filter slot, or extend a bumper by 3mm. You can find TPU filament and compatible 3D printers at UAVMODEL.
2. Frame Bumpers and Arm Guards
Arm guards are sacrificial parts that protect your carbon fiber arms from direct impact. A well-designed TPU arm guard slides over the end of the motor arm, providing a flexible bumper that scrapes instead of the carbon delaminating. Print them with 4-5 perimeters at 98A hardness for the best abrasion resistance. Replace them when they wear through — that is their job.
Full frame bumpers (also called “bumper cages”) wrap around the entire frame perimeter. Popular on cinewhoops and beginner builds, they prevent prop strikes on gates and walls. The Shendrones Squirt and similar designs integrate bumpers directly into the frame architecture.
3. Camera Mounts and ND Filter Holders
The FPV camera mount is the most critical TPU part on the drone. It must hold the camera securely at your chosen angle while absorbing crash impacts that would otherwise destroy the camera sensor or lens. Key design features of a good camera mount:
- Adjustable angle: Integrated slots or multiple mounting holes for 15-55 degree camera tilt.
- Side plate protection: Extended side plates shield the camera from lateral impacts. The camera should never be the first thing to contact an obstacle.
- Soft and hard TPU combination: Some premium mounts use 95A for the flexible sections and inserts of 98A or rigid TPU for screw bosses. This gives flexibility where needed and rigidity for mounting.
- ND filter slot: A slot in front of the lens holds an ND filter for cinematic shutter speed control. Essential if you fly with a GoPro.
4. GoPro and Action Camera Mounts
A TPU GoPro mount serves two purposes: holding the camera at your desired angle and providing vibration isolation. The best designs use a “floating” TPU cradle that isolates the camera from frame vibrations. The Brain3D and NBD (NewBeeDrone) GoPro mounts are community standards. Print at 95A with 80 percent infill for the right balance of grip and flexibility.
For protection, add a TPU “roll cage” around the GoPro. These cage mounts surround the camera on three sides and have saved countless GoPros from direct impacts. The weight penalty (8-12g) is negligible compared to the cost of replacing a GoPro.
5. GPS Holders and VTX Antenna Mounts
GPS modules need stable mounting with a clear sky view. A TPU GPS mast raises the module above the frame on a flexible stalk that absorbs vibration. Popular designs include integrated zip-tie channels and M3 screw mounting points. Print with 3-4 perimeters at 95A hardness.
VTX antenna mounts in TPU protect expensive antennas and the SMA/MMCX connector. A pigtail-to-SMA mount isolates crash forces from the VTX board connector, transferring impact to the flexible TPU instead. For direct MMCX antennas, TPU guides keep the antenna oriented correctly and prevent it from being sucked into the props.
6. Battery Pads, Landing Skids, and Wire Management
The small TPU parts make the biggest quality-of-life difference:
- Battery grip pads: TPU sheets with ridges glued to the top plate or battery strap area prevent the battery from sliding during aggressive maneuvers. Battery ejection mid-flight is catastrophic — grip pads prevent it.
- Landing skids: Tall TPU skids on the bottom of the arms protect the battery from ground contact and give clearance for bottom-mounted components. The Ummagawd-style skids with integrated zip-tie channels are the standard.
- Wire management clips: Small TPU clips that snap onto standoffs keep motor wires, receiver antennas, and capacitor leads organized. Clean wiring is not just aesthetic — it prevents wires from reaching the props.
- RX antenna guides: TPU tubes or channels that route the receiver antenna wires safely through the frame and hold them in the correct orientation.
7. Printing Tips for Perfect TPU Parts
TPU requires different print settings than rigid filaments, but once dialed in, it prints reliably:
- Dry your filament. TPU absorbs moisture quickly. Dry at 55°C for 4-6 hours before printing. Wet TPU pops and sputters during printing, creating weak, ugly parts.
- Slow down. 20-25mm/s for 95A, 30-35mm/s for 98A. Speed causes extrusion inconsistency with flexible filaments.
- Disable retraction. TPU stretches. Retraction pulls the filament out of the melt zone and creates gaps. Coasting or wipe settings compensate better.
- Print one part at a time. TPU strings heavily. Printing multiple parts means the nozzle travels between them, leaving strings everywhere. Single-part prints are cleaner.
- Use a direct drive extruder. Bowden tubes create too much friction for 95A and softer TPU. If you must use Bowden, stick to 98A or harder.
A well-organized collection of TPU parts transforms your drone from fragile to field-ready. Print spares of every part — the best time to print a replacement camera mount is before you need it.