3D-Printed Car Accessories to Sell: Plastics That Survive Heat
A summer dashboard reaches 69°C; PLA gives up at 57. Four car parts priced in four plastics, and the places a seller should never mount anything.
Car accessories are a good printed product: phone mounts, cup-holder coasters, headrest hooks and console trays are small, useful and made to fit, which mass-produced parts rarely do. They fail in one way that ends in a bad review, and it is heat. A dashboard in summer sun gets hotter than ordinary PLA can take. We modelled four car parts, sliced each in four plastics on our production printers, and set each plastic against the temperatures a parked car really reaches.
The part
It lives
Dashboards averaged 69°C (157°F) after an hour parked in the sun on 100°F days.
- PLA Basic57°CSoftens$1.63
- PETG-CF74°CClose$1.93
- ABS87°CHolds$1.97
- ASA100°CHolds · UV$1.77
The black line is 69°C. Cheapest plastic with room to spare here: ASA, $1.77 to make, 28 min on the printer. The magnet ring is $2.99, and fitting it adds $2.00.
Keep anything you sell for the dashboard off the airbag cover. NHTSA: equipment mounted “to, in front of, or on top of the instrument panel” of an airbag-equipped vehicle can interfere with deployment or become “a projectile inside the passenger compartment.”
Heat deflection at 0.45 MPa from Bambu Lab’s data sheets, a lab threshold rather than a promise; “close” means under 15°C of margin. ASA is the one its maker rates for long-term outdoor use and UV. Parts modelled for this page and sliced in each plastic on our production profile (2026-10-18); make cost at today’s price per gram and print-hour rate.
The number that matters
A summer dashboard is hotter than PLA can take.
MeasuredIn an Arizona State University study, dashboards averaged 69°C after an hour parked in the sun on 100°F days. PLA Basic’s heat deflection temperature is 57°C.
Which plastic for which spot
- On the dashboard
- ASA or ABS. ASA keeps its shape to 100°C and ABS to 87°C, well clear of a 69°C dashboard; PETG-CF, at 74°C, has almost no margin left. PLA will sag.
- In the cabin, out of the sun
- Cup holders, door pockets, consoles and the back of a seat sit in cabin air, which averaged 47°C. PETG-CF, ABS and ASA have room to spare. PLA has 10°C, too little for anything carrying a load, such as a bag hook.
- Outside the car
- ASA. It is the one of these that its maker rates for long-term outdoor use, with resistance to UV and fading.
ASA also came out the cheapest of the three heat-safe plastics on all four parts, because its print profile runs faster: the vent mount prints in 28 minutes in ASA against 32 in ABS, $1.77 to make against $1.97. Heat deflection is a lab figure under a fixed load, not a promise, so leave a margin. For the same comparison across every plastic we stock, see materials for everyday use.
What sells, and what never to make
- Mounts
- Phone mounts for a vent or a dashboard, with a MagSafe-compatible magnet ring fitted into a recess. Our reference mount takes an 18-magnet ring, which we fit before packing if you ask, at $1 a piece.
- Inserts and organisers
- Cup-holder coasters, console trays, coin and card holders, door-pocket bins. Sell them by car model, where a printed part fits better than a universal one.
- Hooks and clips
- Headrest bag hooks, sunglasses clips, cable clips. Light, cheap to make and bought in pairs.
- Never on an airbag
- NHTSA warns that equipment mounted “to, in front of, or on top of the instrument panel” of an airbag-equipped car can interfere with deployment or become “a projectile.” Tell buyers where not to fit a dashboard mount.
- Never a safety part
- Nothing in a seat belt, a child seat, the pedals, the brakes or the wheels. A printed part should never be what keeps someone safe.
A car maker’s badge or logo belongs to the car maker. Sell your own designs, and see what you can legally sell before printing anything that carries someone else’s name. This is general information, not legal advice.
Designing for a car
- Measure the car
- Vent slats, cup holders and headrest posts vary from model to model. Design for one car, say which in the listing, and you sell a part that fits rather than one that nearly does.
- Expect vibration
- A snap fit that holds on a desk can rattle loose on a road. Add a screw, a clamp or a soft pad where parts touch.
- Design the hardware in
- A magnet ring wants a recess its exact size; our ring calls for 56.4 mm outside, 45.6 mm inside and 1.4 mm deep. Every catalogue part lists the hole or recess it needs.
- Thicker than indoors
- A part that sits in a hot car for a summer creeps under a constant load. Give hooks and clips more section than they would need at room temperature.
For phone mounts and stands beyond the car, see desk accessories to sell; for the plastic that bends instead of rattling, TPU; and for the hole every magnet and insert needs, inserts and magnets.
FAQ
It will not melt, but it softens and sags. PLA Basic’s heat deflection temperature is 57°C, and dashboards averaged 69°C after an hour parked in the sun on 100°F days in an Arizona State University study.
ASA for anything in the sun or outside the car: it keeps its shape to 100°C and is made for outdoor use. ABS (87°C) is a good choice inside. PETG-CF (74°C) is fine out of the sun. Avoid PLA for anything that stays in the car.
For most of them, yes. ASA takes more heat (100°C against 87°C in Bambu Lab’s data) and resists UV and fading, and every one of our four car parts sliced faster in ASA than in ABS, so it cost less to make too.
Phone mounts, cup-holder coasters and inserts, console trays, headrest hooks and clips, especially when designed to fit a specific car model.
Keep it off the airbag cover and out of the airbag’s path. NHTSA warns that equipment on or in front of the instrument panel can interfere with deployment or become a projectile. A vent mount clear of the airbag is the safer design.
Made in the plastic the spot needs.
Pick the plastic per product, add the magnets or hardware, and every order is printed, fitted, checked by hand and shipped under your name.
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