Best filament for camper parts
PLA, PETG, ASA, ABS, TPU, nylon, and carbon-filled blends, judged by heat, sun, and how hard they are to print.
Photo: Jakub Żerdzicki / Unsplash
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Heat is the first filter
A parked rig in July is an oven. Cabin air in a closed vehicle in full sun commonly reaches the range where PLA softens. Glass transition is the temperature where the plastic stops acting like a solid. Typical published figures: PLA near 60°C, PETG near 80°C, ASA near 100°C, ABS near 105°C. Heat-deflection numbers, which are closer to "will this clip hold a shape under a little load," sit lower than the glass transition. PLA often deflects in the mid 50s °C. That is a bad match for a dash, a roof vent, or a west-facing cabinet.
So the default for interior parts is PETG. The default for sun and roof parts is ASA. PLA is a test-fit material. The rest of this page is the exceptions.
Side by side
| Filament | Heat | UV | Feel | US $/kg, late 2026 | |
|---|---|---|---|---|---|
| PLA | Tg about 60°C. Softens in a hot cabin. | Poor | Stiff, brittle | Easiest. No enclosure. | About $10–$25 |
| PETG | Tg about 80°C. Everyday cabin parts. | Better than PLA | Tough, a little flex | Easy. Watch stringing. | About $15–$30 |
| ASA | Tg about 100°C. Sun and roof. | The outdoor choice | Stiff, impact tough | Enclosure and a vent. | About $20–$40 |
| ABS | Tg about 105°C. | Poor. Use ASA outside. | Stiff | Enclosure, more fumes than PETG. | About $15–$30 |
| TPU | Stays rubbery. Not a hot-roof plastic. | Decent | Flexible. 95A is the usual shore. | Slow. Direct drive helps. | About $25–$45 |
| Nylon | Strong when dry. Soaks up water. | Varies by blend | Tough, wears well | Dry it. Enclosure helps. | About $40–$80 |
| CF blends | Stiffer than the base plastic. | Follows the base (ASA-CF for sun) | Stiff, abrasive | Hardened nozzle. Still needs a vent if the base is ABS or ASA. | About $40–$90 |
Dollar ranges are typical US street prices per kilogram in late 2026, from commodity spools up to name-brand ones. A sale refill can sit at the bottom of the range. Carbon-filled nylon sits at the top.
Where each one belongs
Interior clip, latch trim, cup holder, drawer glide: PETG. Gasket, bumper, or a foot that should give: TPU. Awning end cap, vent hood, mirror arm cover: ASA. A hinge that sees the heater: do not get clever. Buy the original if it is gas or load-bearing, and read the safety note on the parts guide.
Nylon and carbon-filled blends are for a bracket that has to be stiff and you are willing to dry the spool and run a hardened nozzle. They do not excuse skipping the enclosure when the base polymer is ASA or ABS. Fumes and heat resistance travel together. Overture and Polymaker are the filament shops we link. Amazon is there when you already know the spool you want.