Industries
3D printed drone and UAV parts in the UK: materials, orientation and batches
For 3D printed drone and UAV parts, carbon-fibre filled nylon and SLS PA12 are the usual choices for stiff, light structure, and ASA for exposed skins. Parts are strongest along the layers, so build orientation matters as much as the material. UK production means a revised part can arrive between flight tests in days.
Reviewed by HenleyPrint3D engineers6 min readUpdated
Key takeaways
- Stiff structure: carbon-fibre filled FDM nylon or SLS PA12.
- Outdoor skins and fairings: ASA, with UV stability and heat resistance around 100 °C.
- Print the load path along the layers; layer lines are the weak plane.
- Use heat-set inserts where fasteners are cycled.
- Repeat batches are built from recorded settings so batch two matches batch one.
Suits
Drone developers, defence and aerospace teams and research groups iterating UAV airframes, payload bays and mounts.
Worth knowing
We supply prototypes, test hardware and non-critical parts with build records. We do not certify airworthiness.
Which process and material for each UAV part?
| UAV part | Process | Usual material | Watch for |
|---|---|---|---|
| Arms and motor mounts | SLS or FDM | PA12 or carbon-fibre filled nylon | Orient load along layers; tie bosses into ribs |
| Airframe sections and fairings | FDM or SLS | Carbon-fibre filled nylon for structure, ASA for skins | Layer lines show under gloss paint |
| Payload brackets (optics, antennas, sensors) | FDM | Carbon-fibre filled nylon | Check alignment on the first article |
| Electronics bays and enclosures | FDM or SLS | PA12 or CF-nylon, 2.5 to 4 mm walls | Gasket groove; test ingress on a sample |
| Ducts, vents and cable guides | SLS or FDM | PA12 or ABS | SLS needs no support inside the bore |
| Wind tunnel models | SLA | Rigid resin | Brittle under repeated impact |
Material data is on the FDM materials and SLS materials pages. The robotics and automation page covers related lightweight structures.
Print orientation rules for strength
- FDM and SLS parts are weaker between layers than within them. Run the main load along the layers.
- A tab printed upright snaps at a layer line; the same tab printed flat flexes.
- Point-loaded bosses are where trial damage starts. Tie bosses into ribs.
- Print bearing seats and critical bores slightly undersize and finish to size.
- Use heat-set threaded inserts, not printed threads, for any fastener that is cycled.
The article on layer orientation and part strength explains the reason.
Design for stiffness, vibration and crashes
These points are general UAV design practice, not HenleyPrint3D claims. Confirm against your own flight and load tests.
Worked example: hollow arm versus solid arm
Compare a solid 20 x 20 mm square arm with a hollow arm of the same outside size and 2 mm walls. Second moment of area for a square is side⁴/12. Solid: 20⁴/12 = 13,333 mm⁴. Hollow: (20⁴ - 16⁴)/12 = (160,000 - 65,536)/12 = 7,872 mm⁴, which is 59% of the solid stiffness. Cross-section area is 400 mm² solid and 400 - 256 = 144 mm² hollow, so the hollow arm has only 36% of the material. Stiffness per unit mass improves by 0.59 / 0.36 = about 1.6 times. A hollow SLS arm needs powder escape holes; FDM arms can be printed with an internal rib pattern.
- Vibration: motor mounts excite the frame at rotor frequency. Stiffer, lighter structure has a higher natural frequency (proportional to the square root of stiffness divided by mass). Avoid long unsupported arms.
- Crash: design a defined break point, for example a thinner arm near the root, so a crash breaks a cheap part and not the airframe.
- Centre of gravity: record each part's mass. Variation of a few grams in a small airframe changes balance.
- Radio: carbon and carbon-filled materials can attenuate radio signals. Keep antennas, GPS and telemetry modules clear of carbon-filled parts, and check range on a test flight.
- Heat: motors and speed controllers get warm. Keep PLA away from heat sources; ASA works to around 100 °C, and nylon-based materials tolerate more. Check datasheets.
- UV and moisture: ASA suits sunlight. Nylon takes up moisture, which changes stiffness slightly and size a little, so seal or allow tolerance for tight fits.
Reducing part mass
Mass can be removed where material carries no load and where fasteners and flanges can be merged. Keep interfaces fixed, replace everything between them with ribs or lattice, and merge brackets and their clips into one part. The saving is calculated per part from the load case, so ask us for part mass rather than relying on a generic figure.
Quotes for UAV design iterations
Send the model and the load case. We reply with material, orientation advice and dispatch date.
Choosing between SLS and FDM for UAV parts
| Part | Prefer SLS PA12 when | Prefer FDM when |
|---|---|---|
| Motor mount or arm | Complex ribbed geometry, no supports, many identical parts | You need carbon-filled stiffness or a long part above 300 mm |
| Fairing or skin | The shape is small and detailed | The shape is large, up to 1000 mm, and ASA suits sunlight |
| Bracket for a sensor | Hollow or nested geometry | Fast single iteration and large size |
| Duct or cable guide | Internal bore with no supports | Straight, large-diameter run |
Tolerance is ±0.3% for SLS and ±0.5% for FDM, both with a ±0.3 mm minimum. For a 100 mm hole spacing on a sensor mount, that is ±0.3 mm in SLS and ±0.5 mm in FDM. Mark critical holes, and finish or ream bores that take bearings and pins (see 3D printing tolerances).
A checklist before you send a UAV part
- Say which direction the main load acts.
- State the temperature range and whether the part sits near a motor or battery.
- Mark the fixings: insert type, bolt size and torque.
- Mark critical bores, mating faces and the tolerance you need.
- State quantity, and if the part will be repeated, say so and we will record the settings.
- State whether a drawing, mass target or colour is required.
- Say if the design is confidential. NDAs are available on request.
From one prototype to a batch
| Stage | What changes |
|---|---|
| First article (1 to 3 calendar days) | Material chosen for the duty, checked against reference hardware. |
| Flight-test revision | Send the revised model. No tooling, so a change costs one rebuild. |
| Frozen design | Quantity built; machine, orientation, layer height and settings recorded. |
| Repeat order | Built from the same record so it matches the first batch. |
We make from one part to thousands. For larger volumes, we will tell you whether moulding is cheaper (see the low-volume manufacturing guide). The defence and aerospace industry pages cover NDAs, records and limits. The defence additive manufacturing supplier guide sets out what we cannot offer.
Lead times for UAV parts
Standard lead time starts from 1 calendar day (SLS from 2). Part size and finishing move the date, and the quote gives the committed dispatch date.
Frequently asked questions
What is the best 3D printing material for a drone frame?
Carbon-fibre filled nylon (FDM) or SLS PA12 for stiffness per gram, and ASA for exposed skins. The right choice depends on load and temperature, so tell us both.
Can you print UAV parts in the UK in a few days?
Yes. Standard lead time starts from 1 calendar day, SLS from 2. Finishing and size can add time; the dispatch date is in the quote.
Why do printed drone arms snap?
Printed parts are weakest between layers. Print the load path along the layers, tie bosses into ribs and use heat-set inserts instead of printed threads.
Can I order the same UAV part in batches of tens or hundreds?
Yes. Build settings are recorded so a repeat run matches the first. Beyond a few hundred we say if moulding is a better route.
Do you certify parts as airworthy?
No. We supply prototypes, test hardware and non-critical parts with build records to support your own qualification route.
Can I use carbon-fibre filled 3D printed parts near a GPS or radio antenna?
Carbon and carbon-filled materials can attenuate radio signals, so keep antennas and GPS modules clear or use an unfilled material near them, and check range in a test.
How strong is a 3D printed drone arm?
It depends on material, section and print orientation. A hollow or ribbed section can keep much of the stiffness at lower mass; test a prototype under your load, because the layer direction decides the weak plane.
What infill or wall thickness should drone parts have?
Thicker walls and ribs along the load path matter more than infill percentage. Our enclosure guidance is 2.5 to 4 mm walls; an engineer will advise for structural parts.
Get started
Talk to an engineer about your part.
Send your CAD, or describe the problem and the duty. We recommend the process, material and finish, and quote with the dispatch date up front.
Uploads are secure and confidential