If you’re choosing a filament for a specific part rather than defaulting to whatever’s already on the spool holder, the decision usually comes down to three questions: does it need to survive heat, does it need to survive impact, and can your printer handle it without an enclosure.
| PLA | PETG | ABS | |
|---|---|---|---|
| Typical nozzle temp | 190–220°C | 230–250°C | 230–250°C |
| Typical bed temp | 50–60°C | 70–80°C | 90–110°C |
| Warping risk | Low | Low–moderate | High without an enclosure |
| Heat resistance | Low (softens around 55–60°C) | Moderate (softens around 70–80°C) | Higher (softens around 95–105°C) |
| Impact strength | Brittle-ish; low flex before cracking | Good, tougher than PLA | Good, with better impact resistance than PLA |
| Stringing tendency | Low | Moderate–high (needs retraction tuning) | Low–moderate |
| Odor while printing | Mild | Mild | Noticeable; ventilation matters |
| Good default for | Models, prototypes, most household items | Functional parts, outdoor-adjacent use, mechanical fittings | Parts needing heat resistance, enclosures, higher-stress mechanical use |
PLA: the default for a reason
PLA is the easiest of the three to print well: low warping, no enclosure needed, and a wide margin for error on temperature. Its main limitation is heat resistance: a PLA part left in a hot car or near a heat source can visibly soften and deform. For anything that stays indoors at normal temperatures and doesn’t need to flex or absorb impact, PLA is usually the right default, not just the easy one.
PETG: the step up for functional parts
PETG holds up better to heat and impact than PLA while still not requiring an enclosure for most printers. The trade-off is a stronger tendency to string (see stringing) and a slightly narrower sweet spot on cooling; see the PETG guide for the specifics. It’s a reasonable first “upgrade” material once PLA’s limitations start to matter for a given project.
ABS/ASA: for heat and an enclosure
ABS resists heat and impact better than PETG in most comparisons, but its higher shrinkage on cooling makes it prone to warping (see warping) unless you have an enclosure or heated chamber. ASA is chemically similar to ABS but handles UV exposure noticeably better, making it the better choice specifically for parts that will sit outdoors. Neither is a good starting material without at least a basic enclosure or a printer that already runs an unusually warm ambient temperature.