PLA vs PETG vs ABS: choosing the right filament for your part

When a print fails or a part snaps in use, the printer usually gets the blame. In our production queue, the more common culprit is a mismatch between the material and the job. Here's how we decide, in the order we actually ask the questions.

Question one: will the part live near heat? PLA softens around 60°C — a dashboard in Chennai summer sun, an enclosure next to a motor driver, or a bracket near a hot end will slowly droop. For anything warm, PETG (comfortable to ~75°C) or ABS (~95°C) is the floor. For everything room-temperature — visual models, jigs, educational kits — PLA's stiffness, easy printing, and crisp detail make it the default.

Question two: does it need to survive drops and stress? PLA is stiff but brittle: it holds shape beautifully and then cracks suddenly. PETG bends before it breaks, which is what you want for clips, enclosures with snap-fits, and student robotics parts that will be dropped weekly. ABS matches PETG's toughness and machines/sands better, but demands an enclosed printer and good ventilation because it warps and emits fumes.

Question three: flexibility or chemical exposure? Gaskets, phone-case-like shells, and vibration dampers call for TPU — slow to print but nearly indestructible. Parts meeting oils or repeated friction (gears, sliding mechanisms) justify Nylon, with the caveat that it drinks moisture and must be dried before printing. Carbon-fiber blends add stiffness for drone frames and brackets, at the cost of hardened nozzles.

A quick reference from our lab: educational and architectural models → PLA. Functional enclosures, brackets, outdoor parts → PETG. Automotive-style parts and anything to be post-processed heavily → ABS. Flexible or impact parts → TPU. Wear parts and load-bearing engineering pieces → Nylon or carbon-fiber blends.

If you're unsure, send us the part's job description rather than a material name — 'holds a 500 g sensor on a drone arm, outdoors' tells us more than 'print in ABS please', and often saves you a reprint.