PETG vs PLA: Which Filament Should You Choose?

PLA and PETG cover ninety percent of what most people print, and the internet argues about them endlessly. The honest answer is boring: PLA is easier and prettier, PETG survives heat and abuse better, and the right choice depends on where the part will live. Here is the decision in five minutes, grounded in the actual profile numbers.

The short version

• Choose PLA for anything decorative, dimensional, or indoors at room temperature: figures, prototypes, organizers, toys, fine-detail models. It prints easier, bridges better and looks sharper.
• Choose PETG for anything functional that sees warmth, moisture, sun or repeated stress: brackets, outdoor-ish fixtures, containers, clips and anything living in a car’s cabin outside of summer heat waves.
• Choose neither for parts that must survive serious heat or full-time sun — that is ASA territory, covered in our ABS/ASA guide.

Heat: the clearest difference there is

Every filament has a temperature where it stops being rigid, and the two materials sit meaningfully apart: Bambu’s profile data puts PLA’s softening point around 45 °C and PETG’s around 60 °C. Fifteen degrees does not sound like much, but it is exactly the gap between “survives a windowsill” and “survives a parked car in spring”. A PLA hook holding a heavy coat above a radiator will slowly stretch; the same hook in PETG holds its shape.

The flip side: that same low softening point is why PLA prints so well. It solidifies fast under full cooling, which is where its crisp corners and clean overhangs come from.

Toughness: less different than the forums say

An interesting number from Bambu’s own filament data: impact strength across layers is nearly identical — 13.8 kJ/m² for PLA and 13.6 for PETG. Along the layers, the practical difference is in how they fail: PLA is stiff and snaps cleanly when overloaded, while PETG flexes and gives before it breaks. For a bracket that gets torqued, dropped or repeatedly clipped in and out, PETG’s forgiving failure mode wins. For a stiff structural shape that must not flex at all, PLA’s rigidity is actually the better property.

Sunlight is less symmetric: UV and weather degrade PLA visibly, and PETG tolerates them noticeably better — though for permanent outdoor duty ASA still beats both.

Ease of printing: PLA, and it’s not close

The settings tell the story. Everything about PLA’s profile is relaxed; everything about PETG’s is a compromise between adhesion, stringing and layer bonding:

Full cooling means PLA handles overhangs and bridges PETG can only dream of, and the higher volumetric limit means it also prints faster. PETG’s restricted fan is the price of decent layer bonding — and the reason its overhangs droop. PETG also strings more than any other common material and drinks moisture faster than PLA; if you have ever seen a PETG print covered in fine hairs, the spool was probably wet (see the drying guide).

One PETG quirk worth knowing before you choose it: it bonds too well to smooth PEI plates and can tear the coating — textured PEI or a film of glue stick is the rule. PLA sticks politely to every plate Bambu makes.

Detail and finish

PLA wins on looks. It holds sharp corners, tiny text and steep overhangs, and matte PLA hides layer lines beautifully. PETG has a characteristic glassy shine, slightly softer detail (that restricted fan again), and a talent for tiny blobs on otherwise clean walls. If the part’s job is to be seen, print it in PLA; if its job is to work, PETG earns its slightly scruffier finish.

Decision checklist

• Indoors, room temperature, looks matter → PLA
• Clips, snap-fits, repeated flexing → PETG
• Sees 50 °C+ (car cabin, near heat sources) → PETG (beyond ~60 °C, step up to ASA)
• Steep overhangs, bridges, fine detail → PLA
• Damp environments, occasional sun → PETG
• Fastest possible functional prototype → PLA, then reprint the final part in PETG if it needs to survive

Once you have chosen, the full setting walkthroughs are here: PLA complete settings guide and PETG complete settings guide.