Filament Selection Guide for Drone Builders: TPU, PLA+, ABS, ASA and Nylon Compared

The filament you choose determines whether your printed part survives the first crash or shatters on impact. For FPV drone applications, where parts experience repeated vibration, impact loading, and outdoor exposure, material selection is not optional — it’s the difference between a reliable component and a flight-ending failure. This guide compares the five most common filament types used by FPV builders, with detailed mechanical properties and application recommendations for each.

TPU: The Workhorse of FPV Printing

Thermoplastic Polyurethane is uniquely suited to drone applications. With Shore hardness ranging from 85A (very flexible) to 65D (semi-rigid), TPU absorbs impact energy through elastic deformation rather than fracture. A TPU GoPro mount will compress on impact, protecting the camera, then return to its original shape. No other common filament offers this combination of flexibility and toughness.

TPU’s key specifications for drone builders: tensile strength 25-50 MPa (varies by hardness), elongation at break 400-600%, glass transition temperature -40°C (stays flexible even in freezing conditions), and excellent UV resistance. The material is inherently resistant to fuel, oil, and common solvents — your TPU parts won’t degrade from exposure to prop lubricants or cleaning chemicals. The downsides: TPU is difficult to print quickly (20-30mm/s maximum recommended speed), requires a direct-drive extruder for reliable results, and cannot be smoothed or post-processed with common techniques (sanding just fuzzes the surface). Sainsmart TPU, Overture High-Speed TPU, and NinjaTek NinjaFlex are the premium options; eSun TPU-95A provides excellent value.

PLA+ and PLA Pro: Better Than You Think

Standard PLA is too brittle for drone applications — it shatters on impact with the characteristic jagged fracture surface of brittle failure. PLA+ (also marketed as PLA Pro or Tough PLA) adds impact modifiers (typically thermoplastic polyurethane or ABS copolymers) that dramatically improve toughness while retaining PLA’s printability. eSun PLA+ and Polymaker PolyMax PLA achieve impact strengths 5-8x higher than standard PLA, making them viable for non-critical drone parts.

PLA+ is appropriate for: sim drone frames (never flown), prototype parts for fit-checking before printing in expensive materials, and indoor cinewhoop ducts where impacts are low-energy. It is not appropriate for: outdoor flight components, anything mounted to the frame that experiences vibration, or parts exposed to direct sunlight (PLA softens at 55-60°C, easily reached in a car or on hot asphalt). PLA+ prints beautifully at 210-225°C with no enclosure and excellent detail resolution — if you need a part to look good and don’t need it to survive a crash, PLA+ is the easiest material to use.

PETG: The Practical Middle Ground

PETG (Polyethylene Terephthalate Glycol-modified) offers an excellent balance of strength, toughness, printability, and cost. With tensile strength of 45-50 MPa and impact strength roughly 3x that of standard PLA, PETG handles the vibration and moderate impacts of drone flight without the printing difficulty of TPU or nylon. Layer adhesion is excellent — properly printed PETG parts fail across layers only at extreme loads.

PETG is ideal for: FC/ESC mounting adapters, GPS masts, antenna holders (non-impact), and any structural part that doesn’t need TPU’s impact absorption. It’s chemically resistant to most substances and has better temperature resistance than PLA (glass transition at 80°C). The material prints at 230-250°C with a 70-85°C bed, with stringing as the primary print quality challenge — PETG likes to ooze, so dial in retraction settings carefully. Prusament PETG and Overture PETG are the community standards.

ABS and ASA: For When It Has to Survive Outside

ABS (Acrylonitrile Butadiene Styrene) and ASA (Acrylonitrile Styrene Acrylate) are engineering thermoplastics with excellent mechanical properties, temperature resistance, and durability. ASA is essentially ABS with the butadiene replaced by acrylate rubber, providing dramatically better UV resistance — ASA parts won’t yellow or embrittle in sunlight, making it the superior choice for outdoor drone components.

Printing ABS/ASA requires an enclosed chamber (to prevent warping from drafts), a heated bed at 100-110°C, and adequate ventilation (the fumes are unpleasant and potentially harmful). When dialed in, ASA produces parts with layer adhesion approaching injection-molded strength. For drone applications, ASA is the best choice for components that need to survive in a hot car (glass transition at 105°C) or spend extended time in direct sunlight. Polymaker ASA and Prusament ASA print with minimal warping and excellent dimensional accuracy.

Nylon and Composites: The Engineering-Grade Option

Unfilled nylon (PA6, PA12) offers the best combination of toughness, durability, and chemical resistance of any common filament, but it’s challenging to print due to warping, moisture absorption, and poor bed adhesion. Carbon fiber or glass fiber filled nylon (PA-CF, PA-GF) dramatically improves stiffness and printability while retaining nylon’s toughness. The carbon fibers constrain thermal expansion, virtually eliminating warping, and the rough surface finish provides excellent bed adhesion on a PEI sheet with glue stick.

PA-CF is the recommended material for load-bearing drone components: frame arms (micro builds), motor mounts, and structural plates. The stiffness-to-weight ratio approaches that of bulk plastics used in commercial drone manufacturing. Bambu Lab PAHT-CF, Polymaker PA6-CF, and 3DXTech CarbonX PA6+CF are the leading options. All require a hardened steel nozzle (0.4mm minimum, 0.6mm recommended to prevent clogs), a filament dryer, and an enclosure. The material cost ($60-80/kg) is the highest of any common filament, but a typical drone part uses 3-8g of material — about $0.25-0.60 per part.

The best FPV builders maintain a filament library with at least TPU (impact parts), PETG (structural parts), and one engineering material (ASA or PA-CF) for demanding applications. Each material has a clear role, and using the right one for each part is the hallmark of a builder who takes their craft seriously.