PLA vs PETG: Which Should You Print?

PLA and PETG are the two rolls most hobbyists actually keep on the shelf. PLA is the easy one you grab for a clean print with no drama. PETG is the tougher one you grab when the part has to survive heat, sunlight, or a real mechanical job.

Ease of printing

PLA runs at roughly 190-220C with the bed at 50-60C. It barely warps, sticks to almost any surface, and prints fine on an open-frame machine in a cold garage. Hand a new maker a roll of PLA and decent first-layer settings, and they get a good part on the first try.

PETG runs hotter: 230-250C hotend, bed at 70-85C. It isn’t hard, but it asks for more attention. Two things trip people up.

• Bed adhesion is the opposite problem. PETG sticks too well to bare glass or PEI and can pull chunks out of the plate. A thin layer of glue stick works as a release agent, not just an adhesive.
• First-layer Z height matters more. Squished too close, PETG smears onto the nozzle; too high and it won’t bond. Give it a touch more gap than you’d use for PLA.

Start a new PETG spool 5-10C below the number on the label, then climb if your layers don’t bond.

Strength, heat, and flex

This is where PETG earns its place. PLA is stiff and surprisingly strong in straight tension, but it’s brittle. Drop a PLA bracket and it can crack along a layer line. It also goes soft around 55-60C, so a PLA part left on a dashboard in summer will sag. I’ve watched it happen.

PETG holds its shape to roughly 70-80C and takes a hit by flexing instead of shattering. It isn’t rubbery, but it has enough give to absorb a knock. For clips, brackets, enclosures, and anything that gets handled or loaded, PETG outlasts PLA.

If you need true flexibility, neither one is the answer. That’s TPU territory. PETG is tough, not bendy.

Layer adhesion and stringing

PETG bonds between layers extremely well, which is a big part of why it holds up on the Z axis. The trade-off is stringing. PETG loves to ooze, leaving fine hairs across travel moves. You fight it with retraction tuning (often 3-6mm on a direct drive, more on a Bowden setup), slightly lower temps, and slower travel. Plan to spend an afternoon dialing in a fresh PETG spool.

PLA strings far less and cleans up fast with a quick pass from a heat gun or a deburring tool. Straight off the spool, PLA just looks tidier.

Moisture, smell, and fumes

Both filaments pull water from the air, but PETG is thirstier. Wet PETG prints with popping sounds, a rough surface, and worse stringing. If a roll has sat open for months, dry it before you blame your settings.

• PLA: around 45-50C for 4-6 hours
• PETG: around 60-65C for 4-6 hours

Don’t push past those temperatures in a dryer or oven. PLA softens near 60C, and run too hot it can fuse into a solid brick on the spool.

On fumes, both are low-odor next to ABS or ASA. PLA smells faintly sweet; PETG is close to neutral. Neither one demands an enclosure or active ventilation for occasional printing, though decent airflow in the room is always smart. ABS and ASA are a different story and do need real ventilation. These two don’t put you in that category.

Weight and material use

PLA has a density of about 1.24 g/cm³; PETG sits around 1.27 g/cm³. Same model, same settings, and PETG uses a little more material by weight, roughly 2-3% per part. Minor on a single print, but costing out a batch of 50 parts, it adds up.

Pick PLA when

• You want a clean print with minimal tuning.
• The part is a display piece, figurine, or prototype.
• Fine detail and crisp overhangs matter most.
• It lives indoors, away from heat and sun.
• You’re new, or teaching someone who is.

Pick PETG when

• The part is functional: a bracket, clip, mount, or housing.
• It’ll see outdoor weather, UV, or water.
• It might get dropped, flexed, or knocked around.
• It sits near heat, like in a car, an attic, or next to electronics.
• You need solid layer bonding for a load-bearing job.

Start here

Keep both on the shelf. Print PLA by default for anything decorative or quick, and switch to PETG the moment a part has a job to do. Buying your first functional spool? Get PETG in a color you’ll reach for often, set the hotend 5C below the label, wipe a little glue stick on the bed, and run a retraction test before the real print. That one test print saves you a tangled, stringy first attempt.