PLA vs PETG vs ABS: Which Filament Should You Use?

The three filaments you will see in every starter kit and every filament aisle are PLA, PETG, and ABS. They are not interchangeable, and picking the wrong one is how a "strong" bracket snaps, or a simple vase turns into a warping headache. The good news is that the choice is mostly about the part, not about brand loyalty.

Quick profile of each

PLA (polylactic acid) is the default for a reason. It prints at a relatively low temperature, barely smells, and does not need an enclosure. It is stiff and looks clean, which makes it ideal for models, prototypes, and indoor parts that will not get hot or take a beating.

PETG (a glycol-modified PET, the same family as water bottles) is the middle path. Tougher and more temperature-resistant than PLA, less fussy than ABS. It shrugs off mild chemicals better than PLA, and it bonds between layers well, so parts are less likely to split.

ABS (acrylonitrile butadiene styrene) is the old workhorse of injection-molded plastics - Lego bricks are ABS. It is tougher in the heat, can be acetone-smoothed to a glossy shell, and holds up as a functional part. It also warps, smells, and wants a warm enclosed printer, which is why beginners bounce off it.

Strength, temperature, and ease of printing

Ease of printing is roughly the opposite of heat resistance:

PLA: nozzle around 190-220°C, bed 50-60°C or even cold on textured plates. No enclosure. The catch is heat: PLA softens around 55-60°C, so a part left in a hot car or on a sunny dashboard will sag.
PETG: nozzle around 230-250°C, bed 70-85°C. Stringing is the usual complaint; a dryer spool and a bit of retraction tuning usually fix it. Heat resistance sits in the middle, roughly 70-80°C.
ABS: nozzle around 240-260°C, bed 90-110°C, and an enclosure so the part does not cool unevenly. Warping off the bed is the classic failure. Print it well and you get a part that survives around 90-100°C and takes acetone vapor for a smooth finish. Ventilate - the fumes are real.

For raw impact toughness, PETG and ABS both beat PLA. PLA is more brittle: it holds shape until it does not, then it cracks. PETG tends to bend before it breaks. ABS is the usual pick when the part has to live near heat or get knocked around.

Best use cases

Match the plastic to the job:

PLA: figurines, organizers, prototypes, indoor brackets that only hold light loads, anything you want to print tonight with no extra setup.
PETG: mechanical parts, plant pots, garage organizers, snap-fits, anything that might see the outdoors or a bit of flex.
ABS: enclosures, automotive interior bits, fixtures near motors or heated beds, parts you want to sand and acetone-smooth.

If you are unsure, PETG is the least-wrong default for "this has to actually do something." Keep PLA for looks and easy prints. Reach for ABS when heat or a polished finish is the point - and when your printer can keep the chamber warm.

Tracking what you have on hand

The practical problem is not choosing one material forever. It is owning a mix - a dry PLA for models, a PETG for brackets, maybe one ABS for a specific part - and still grabbing the wrong spool at 11pm. Label material and print temperature on every spool, keep the thirstier ones dry (PETG especially), and know how many grams are left before you start a long print.

Wet filament will make any of the three look like a bad choice; our guide on how to store 3D printer filament and avoid moisture covers the drying and the boxes. For the inventory side, how to store and track your 3D printing filament walks through labeling and remaining weight.

That mix is exactly what Spool Log is built for: each spool gets a material, a remaining weight to the gram, and a color-coded ring so you can see PLA vs PETG vs ABS at a glance and not start a PETG print on a half-empty PLA. Log the print, watch the grams drop, and reorder the material you actually use.