Outdoor
What filament is best for signs and lettering?
First in this ranking: Bambu Lab PLA Basic.
- Nozzle190–230 °C(374–446 °F)
- Bed35–45 °C(95–113 °F)
- Speedup to 300 mm/s
- Dry50 °C(122 °F)for 8 hManufacturer drying table →
- Density1.24 g/cm³
Nozzle, Bed, Speed, Drying. Source: Bambu Lab TDS · Last checked 14 October 2026
Ranked filaments
| Rank | Filament | Material | Nozzle | Bed | Datasheet | Buy |
|---|---|---|---|---|---|---|
| 1 | Bambu Lab · PLA Basic | PLA | 190–230 °C (374–446 °F) | 35–45 °C (95–113 °F) | Datasheet | |
PLA Basic technical data sheet. Nozzle 190–230 °C (374–446 °F), bed 35–45 °C (95–113 °F), drying at 50 °C (122 °F) for 8 h. A fit for indoor letters on the A1, A1 mini, P1S, and X1 Carbon hotends stored at 300 °C (572 °F). | ||||||
| 2 | Polymaker · Polylite PLA | PLA | 190–230 °C (374–446 °F) | 25–60 °C (77–140 °F) | Datasheet | |
PolyLite PLA lists 190–230 °C (374–446 °F), a bed of 25–60 °C (77–140 °F), 40–60 mm/s, and drying at 55 °C (131 °F) for 6 h. The product page lists the fan on. Indoor lettering can use this row. It is not a UV rating. | ||||||
| 3 | SUNLU · PLA | PLA | 190–230 °C (374–446 °F) | 50–70 °C (122–158 °F) | — | |
SUNLU PLA lists 190–230 °C (374–446 °F) and a bed of 50–70 °C (122–158 °F). Drying on the row is 50–55 °C (122–131 °F) for 8 h from the SUNLU wiki. The plate-reminder sign thread is a printed label, and the top replies say to wash the plate. | ||||||
| 4 | Bambu Lab · ASA | ASA | 235–260 °C (455–500 °F) | 90–110 °C (194–230 °F) | Datasheet | |
Bambu ASA technical data sheet. Nozzle 235–260 °C (455–500 °F), bed 90–110 °C (194–230 °F), drying at 80 °C (176 °F) for 8 h. This is the outdoor-guide material, not a filament named by the sign threads. The bed top is above the A1 maximum of 100 °C (212 °F) and above the A1 mini maximum of 80 °C (176 °F). | ||||||
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Indoor letters can be PLA. A sign that stays in the sun is a different question, and this bank does not answer it with a datasheet.
Indoor lettering
PLA Basic lists 190–230 °C (374–446 °F) and a bed of 35–45 °C (95–113 °F). PolyLite PLA lists 190–230 °C (374–446 °F) and a bed of 25–60 °C (77–140 °F). SUNLU PLA lists 190–230 °C (374–446 °F) and a bed of 50–70 °C (122–158 °F), with drying at 50–55 °C (122–131 °F) for 8 h on the SUNLU wiki. Use a profile for the color you loaded. Two-color letters that change at a layer are on multicolor printing.
r/BambuLab 1lsyhjh is itself a small sign, a reminder of which build-plate side is PLA and which is PETG. The top replies say to wash the plate.
What the outdoor thread reports
r/3Dprinting 1w14zsq is a wood-PLA birdhouse. The poster says it has lasted 3 years outside, with 3 walls and 30% gyroid, and asks if the wood pulp helps with UV. A score-118 reply says their own PLA rarely fails in the sun, names a dashboard boomerang and a greenhouse seed starter as the failures, and says PLA+ on a Florida motorcycle has lasted over a year. That reply also says to try PETG if the part should last. A score-46 reply says PLA does not fall apart after 30 minutes of sun. Those are reports from the thread. PLA outdoors and outdoor filament keep ASA as the sun-facing choice. Bambu ASA lists 235–260 °C (455–500 °F) and a bed of 90–110 °C (194–230 °F). PLA and ASA are the material pages.
Threads that are not sign advice
r/prusa3d 1q8oppv is a CORE One+ filament sensor pinching a PTFE tube. r/3Dprinting 17m6bmr asks someone to design an ABS mirror adapter. r/FixMyPrint 1141uh6 asks if a cheese-like string means the hotend is too hot. The score-63 reply says melted plastic looks like melted plastic. SUNLU and Polymaker are the brand indexes.
Pros and cons
Pros
- Indoor PLA is tied to catalog rows with a nozzle and a bed.
- The outdoor ASA row is labeled as the outdoor guide's material, separate from the birdhouse anecdote.
Cons
- Four of the five threads are not about choosing a sign filament. One is a filament-sensor tube, one is a mirror-adapter request, one is a plate reminder, and one is a melted-filament string.
- The 3-year wood-PLA birdhouse is the poster's report. It is not a weathering test, and wood PLA is not one of the ranked ids.
Printer considerations
- A two-color sign that swaps at a layer does not need an MMU. That use is a score-37 reply on r/prusa3d 139j5ic, cited from the MMU page.
- Outdoor letters still follow the outdoor guide. Dark colors in the sun are called out there as a heat problem, with no temperature rise attached.
- The birdhouse post states 3 walls and 30% gyroid. Those are the poster's settings for that wood-PLA print, not a lettering profile.
What the community says
r/3Dprinting 1w14zsq shows a wood-PLA birdhouse the poster says has lasted 3 years outside, printed with 3 walls and 30% gyroid, and asks whether the wood pulp adds UV resistance. A score-118 reply says their PLA rarely fails in the sun, names a dashboard boomerang and a greenhouse seed starter as the two that deformed, and says PLA+ on a motorcycle in Florida has lasted over a year. The same reply says to try PETG if you want it to last. A score-46 reply says PLA does not dissolve after 30 minutes in the sun. r/prusa3d 1q8oppv is a CORE One+ filament sensor whose PTFE tube is pinched. r/3Dprinting 17m6bmr asks for an ABS mirror adapter and the replies are design notes, not a filament comparison. r/BambuLab 1lsyhjh is a printed reminder of which build-plate side is for PLA and which is for PETG. The top replies say to clean the plate. r/FixMyPrint 1141uh6 asks if a cheese-like string means the printer is too hot. The score-63 reply says melted plastic looks like melted plastic. Later replies flag an Anet A8 power supply.
- Community source, r/3Dprinting 1w14zsq
- Community source, r/prusa3d 1q8oppv
- Community source, r/3Dprinting 17m6bmr
- Community source, r/BambuLab 1lsyhjh
- Community source, r/FixMyPrint 1141uh6
Sources & notes
Accessed 20 October 2026.
- Bambu PLA Basic technical data sheet datasheet
- Bambu ASA technical data sheet datasheet
- PolyLite PLA product page manufacturer
- SUNLU filament wiki manufacturer
- Community source, r/3Dprinting 1w14zsq reddit
- Community source, r/prusa3d 1q8oppv reddit
- Community source, r/3Dprinting 17m6bmr reddit
- Community source, r/BambuLab 1lsyhjh reddit
- Community source, r/FixMyPrint 1141uh6 reddit
Related questions
- Can PLA be used outdoors?Outdoor
- What is the best filament for outdoor use?Outdoor
- How do I print multicolor / which filaments work together?AMS
Questions
Did these threads pick ASA for outdoor signs?
They did not. The birdhouse thread is a wood-PLA anecdote, and one reply tells the poster to try PETG for a longer life. ASA is the material on the outdoor guide, with its own listed nozzle and bed.
How do I print two-color letters without an MMU?
Swap filament at a layer. A score-37 reply on the two-spool Prusa thread names signs as that use. The multicolor guide covers printing more than one filament in one job.