PLA and ASA solve different problems. PLA is the easy indoor filament. ASA is the outdoor specialist that shrugs off sun and heat. The right pick depends on where the part lives.
How they compare
The table maps the gap. PLA leads ease. ASA leads UV, heat, and outdoor use.
| Property | PLA | ASA |
|---|---|---|
| Ease of print | Easy | Hard |
| UV resistance | Low | High |
| Heat resistance | Low | High |
| Outdoor weathering | Poor | Good |
| Fumes | Low | Strong |
| Needs enclosure | No | Yes |
| Best for | Indoor models | Outdoor parts |
When to pick PLA
Pick PLA for models, miniatures, and prototypes that stay indoors. It prints at 200 to 220 °C with no enclosure, per the Prusament PLA datasheet, and it is the easiest filament to print.
When to pick ASA
Pick ASA for parts that see sun or weather. The Prusament ASA datasheet lists a nozzle of 260 °C with a 10 °C margin and a heat deflection of 93 °C. ASA holds color and shape outdoors where PLA softens and fails.
Frequently asked
Can I use PLA outside?
Is ASA harder to print than PLA?
Which handles heat better, PLA or ASA?
Is ASA stronger than PLA?
To go deeper, read what PLA is or what ASA is. For related picks, see PLA versus ABS or ABS versus ASA.
Related guides
Related
Sources & methodology
4 citations · reviewed 2026-07-09- 01Prusament PLA Technical Datasheetaccessed 2026-06-29Tier 1
- 02Prusament ASA Technical Datasheetaccessed 2026-07-09Tier 1
- 03All3DP All 3D Printing Filament Types Explainedaccessed 2026-06-29Tier 2
- 043DSourced Complete 3D Printer Filament Guideaccessed 2026-06-29Tier 2