Heat resistance
What filament survives engine-bay temperatures?
By SSS
Published . Updated .
- Nozzle280–300 °C(536–572 °F)
- Bed40–50 °C(104–122 °F)
- Speedup to 300 mm/s
- Dry100 °C · 10 h(212 °F)
- Density1.17 g/cm³
Heat resistance: HDT 215 °C (419 °F) (ISO 75, 0.45 MPa) · Vicat 219.2 °C (427 °F) (ISO 306) · Tg 74.2 °C (166 °F) · source →
Heat resistance: HDT 173 °C (343 °F) (ISO 75, 1.8 MPa) · Vicat 219.2 °C (427 °F) (ISO 306) · Tg 74.2 °C (166 °F) · source →
Nozzle, Bed, Speed, Drying. Source: Fiberon TDS · Last checked 21 October 2026
Ranked filaments
| Rank | Filament | Material | Nozzle | Bed | Datasheet | Buy |
|---|---|---|---|---|---|---|
| 1 | Fiberon · PA6-CF20 | PA/CF | 280–300 °C536–572 °F | 40–50 °C104–122 °F | — | |
Fiberon PA6-CF20 TDS V1.1, checked 21 October 2026, lists a nozzle of 280–300 °C (536–572 °F), a bed of 40–50 °C (104–122 °F), drying at 100 °C (212 °F) for 10 h, and heat deflection of 215 °C (419 °F) at 0.45 MPa and 173 °C (343 °F) at 1.8 MPa, ISO 75. The row requires a hardened nozzle. The sheet does not mention an engine bay. | ||||||
| 2 | Polymaker · Polylite PC | PC | 260–300 °C500–572 °F | 100–120 °C212–248 °F | Datasheet | |
Open Filament Database nozzle 260–300 °C (500–572 °F) and bed 100–120 °C (212–248 °F). PolyLite PC TDS EN V5.4, checked 21 October 2026, lists heat deflection of 111 °C (232 °F) at 0.45 MPa and 107 °C (225 °F) at 1.8 MPa, ISO 75. The nozzle and bed are the database cells, not a sentence copied from that heat-deflection table. | ||||||
| 3 | Polymaker · Polylite ASA | ASA | 230–260 °C446–500 °F | 75–95 °C167–203 °F | Datasheet | |
PolyLite ASA TDS EN V5.4, checked 21 October 2026, lists a nozzle of 230–260 °C (446–500 °F), a bed of 75–95 °C (167–203 °F), drying at 70 °C (158 °F) for 7 h, and heat deflection of 103 °C (217 °F) at 0.45 MPa and 100 °C (212 °F) at 1.8 MPa, ISO 75. | ||||||
Commission on these links. As an Amazon Associate we earn from qualifying purchases.
An engine bay is hotter than a cabin in the sun, and this batch never states how much hotter. Heat is the general page. Car interior is the dash and the cup holder. Nylon and polycarbonate are the print process for those families. Do not copy a cabin recommendation onto a part that sees oil.
The heat-deflection numbers
Fiberon PA6-CF20 lists a nozzle of 280–300 °C (536–572 °F), a bed of 40–50 °C (104–122 °F), drying at 100 °C (212 °F) for 10 h, and heat deflection of 215 °C (419 °F) at 0.45 MPa and 173 °C (343 °F) at 1.8 MPa. The hardened-nozzle cell is yes. All of that is TDS V1.1, checked 21 October 2026. PolyLite PC stores 260–300 °C (500–572 °F) and 100–120 °C (212–248 °F) from the Open Filament Database. Its TDS, checked the same day, lists 111 °C (232 °F) at 0.45 MPa and 107 °C (225 °F) at 1.8 MPa. PolyLite ASA lists 230–260 °C (446–500 °F), 75–95 °C (167–203 °F), drying at 70 °C (158 °F) for 7 h, and 103 °C (217 °F) at 0.45 MPa and 100 °C (212 °F) at 1.8 MPa. PolyLite PLA lists 60 °C (140 °F) at 0.45 MPa and 58 °C (136 °F) at 1.8 MPa on the TDS checked 21 October 2026. The table is the heat-resistance dataset.
Pros and cons
Pros
- Each heat-deflection pair names the load. 0.45 MPa and 1.8 MPa stay side by side.
- PLA stays in the comparison only as the low sheet, 60 °C (140 °F) at 0.45 MPa, not as a recommendation.
Cons
- No comments, and no sheet cited here, states an engine-bay air temperature or an oil temperature.
- The comments that were supplied are about PC, PA, surface friction, and how to print ASA on a Prusa. They do not measure a bay.
Printer considerations
- Fiberon PA6-CF20 starts at a 280 °C (536 °F) nozzle and asks for a hardened nozzle. A printer whose maximum is below 280 °C (536 °F) does not get to use the 215 °C (419 °F) heat-deflection figure.
- PolyLite PC's database bed is 100–120 °C (212–248 °F). That is a printer limit, separate from the 111 °C (232 °F) heat-deflection number.
- A cabin clip and an engine-bay clip are not the same job. The car-interior page is the sun-through-glass case.
Sources & notes
Published . Updated .
- Fiberon PA6-CF20 TDS V1.1 datasheet
- PolyLite PC TDS EN V5.4 datasheet
- PolyLite ASA TDS EN V5.4 datasheet
- PolyLite PLA TDS EN V5.4 datasheet
- Filament heat resistance dataset other
- a Reddit thread in r/BambuLab reddit
- a Reddit thread in r/prusa3d reddit
- a Reddit thread in r/prusa3d reddit
- a Reddit thread in r/3Dprinting reddit
- a Reddit thread in r/BambuLab reddit
Related questions
- What filament should I use for a car interior?Automotive
- What filament should I use for heat?Heat resistance
- How do I print nylon, and is it worth it?Nylon
- How do I print polycarbonate (PC)?Polycarbonate
Related data
- Cheapest filament per kg
- Cheapest PLA per kg
- Will my dryer cover this filament?
- Drying dataset
- How long to dry PETG
- PA/nylon drying temperature and time
- PC drying temperature and time
- ASA drying temperature and time
Questions
Is 215 °C (419 °F) the temperature an engine bay is allowed to reach?
No. 215 °C (419 °F) at 0.45 MPa and 173 °C (343 °F) at 1.8 MPa are ISO 75 results on the Fiberon PA6-CF20 sheet, checked 21 October 2026. The sheet does not mention an engine. A part in oil, fuel, or vibration is outside that test.
The score-20 comment uses a 120 °C (248 °F) bed for ASA. Is that PolyLite ASA's bed?
No. That sentence is about an MK52 bed and a satin sheet on r/prusa3d. PolyLite ASA TDS EN V5.4 lists 75–95 °C (167–203 °F). The comment's 120C, 45C, and 50C figures stay on that comment.