PLA, PETG, and ASA for vans
Heat, sun, and a little flex. Which plastic belongs in the cabin, on the roof, and in a gasket.
November 10, 2026 · Photo: Jakub Żerdzicki / Unsplash
Heat and sun come first
A parked van or trailer is a greenhouse. Plastic that is fine on a workbench can go soft on a dashboard, in a roof vent, or on an awning rail. The usual published glass-transition figures are about 60°C for PLA, about 80°C for PETG, and about 100°C for ASA. Those are material ranges, not a promise for one brand of spool. Heat-deflection, the point where a part sags under a little load, sits lower than that.
Sun is the other filter. PLA chalks and gets brittle outdoors. PETG holds up better inside, and less well on a roof. ASA is the common choice when the part lives in daylight. ABS can take similar heat, and it weathers worse, so there is rarely a reason to pick it over ASA for a rig. The longer comparison, including prices we have actually seen, is in the filament guide.
Where each one belongs
PLA is for a test fit on the bench. Print the shape, check it, then print the keeper in something that can sit in the cabin. A camper door holder or a Ducato cup holder lives indoors, out of the noon sun. PETG is the default there: tougher than PLA, and still easy to print on an open machine.
Anything on the outside wants ASA. An awning clamp, keder-rail hooks, or a window vent grid see UV and heat the cabin parts do not. Those listings do not specify a filament. The location does. Browse more of the same under vents and fans and latches.
TPU, briefly
TPU is rubber, not a stand-in for PETG. Use it for a bumper, a foot, a gasket that only has to seal light splashes, or a clip that should give instead of snap. It does not replace ASA on a hot roof, and a soft grade will not hold a rigid latch. Print it slowly. A direct-drive extruder is less fussy than a long Bowden tube, which is a reason to care about the printer, not a brand requirement.
Shore hardness is printed on the spool. A higher number is firmer. If the listing or the maker does not name a hardness, ask before you print a seal. A too-soft gasket collapses. A too-hard one never seats.
How to pick without guessing a brand
Interior and shaded: PETG. Outside or in a vent that sees the sky: ASA, and a printer that can be enclosed and vented. Shape check: PLA. Something that has to bend: TPU. If a file's notes name a material, start there, then look at where the part will actually sit.
More cabin organizers are in easy rig storage and storage. None of this is a certified replacement for a gas fitting, a step, or a part that carries the van.