PETG vs ABS in 2026: Which Filament to Print?

PETG vs ABS in 2026: Which Technical Filament Should You Actually Print?

PETG vs ABS: the 30-second answer

If you only read one paragraph: load PETG. For roughly 90% of functional prints coming off a modern printer in 2026 — brackets, jigs, outdoor parts, tool holders, GoPro mounts, prototypes — PETG is the correct answer. It prints on an open bed, it doesn't stink up the room, it's tougher than ABS on the tensile chart, and it survives sunlight and rain.

Reach for ABS when three things line up: a part that needs to sit above 80°C without deforming, an enclosed printer, and a room with ventilation. Engine-bay clips, heater vents, cosplay props you plan to vapor-smooth with acetone — that's ABS territory.

Everything below is the working framework behind that verdict: the numbers, the trade-offs, and which spool to actually put in your cart when you're done reading.

PETG vs ABS at a glance (2026 spec table)

Numbers are ranges pulled from resin datasheets and current slicer material profiles. Don't trust any comparison that gives you a single decimal figure — filament varies batch to batch, brand to brand.

Property	PETG	ABS
Nozzle temp	230–250°C	240–260°C
Bed temp	70–85°C	100–110°C
Enclosure required	No	Yes (for parts over ~80mm)
Tensile strength	~45–55 MPa	~35–45 MPa
Impact strength	High (ductile)	Medium (brittle at room temp)
Heat deflection (HDT)	~70–80°C	~95–100°C
UV / outdoor resistance	Good	Poor (yellows and cracks)
Warping tendency	Low (~0.3–0.5% shrink)	High (~0.8% shrink)
Fumes / ventilation	Effectively odorless	Styrene — vent required
Post-processing	Sanding, UV resin coat	Acetone vapor smoothing
Typical price per kg (2026)	$18–$28	$16–$26

One footnote worth calling out: ABS's HDT advantage is real but narrower than the internet claims. The gap is roughly 20°C, not 50.

Strength: which one actually survives real loads?

On the tensile chart, PETG wins. Around 50 MPa versus ABS's 40 MPa. If you're printing a bracket that gets pulled in one direction, PETG will take more force before it snaps.

Impact is where the story gets interesting. PETG is ductile — it bends, deforms, and eventually tears. ABS is more brittle at room temperature (drop a printed ABS part on concrete and you'll see chips), but it holds up better under repeated flex cycles. A snap-fit lid that opens and closes a thousand times will fatigue ABS more slowly than PETG.

The under-appreciated PETG advantage is layer adhesion. Z-strength on PETG is closer to isotropic than almost any other consumer filament. We've had PETG brackets fail through the wall of the print before they failed along a layer line — the opposite of what usually kills ABS parts.

Real-world call:

Functional brackets, jigs, tool holders, mounts: PETG.
Snap-fit hinges that flex thousands of times: ABS still edges it.
Anything with threaded inserts: PETG. The ductility means the plastic gives instead of cracking around the heat-set insert.

Heat resistance: the one area ABS still wins

This is where the choice actually matters. PETG's glass transition sits around 80°C. That sounds high until you park a car in the sun in Phoenix — a black dashboard hits 70–85°C in summer, and we've watched PETG phone mounts sag into a Salvador Dalí pose by August.

ABS holds around 95–100°C HDT. It's why the automotive industry still specifies ABS for interior clips and heater vents, and why enclosed printer chambers were built out of it a decade ago.

The rule of thumb we use:

Part will live in direct sun on a dark surface, or inside anything with a motor → ABS.
Part sees room temperature or moderate outdoor conditions → PETG.

If the part is going outdoors permanently, consider skipping ABS entirely and going to ASA. It's the UV-stable cousin of ABS — same HDT, same enclosure requirements, but it doesn't chalk and yellow after a summer on the mailbox. Eryone ASA is what we stock for that use case.

Warping and enclosure requirements

Warping is the hidden cost of ABS, and it's why most people who "hate ABS" actually just hate printing ABS on an open-frame machine.

ABS shrinks roughly 0.8% as it cools from print temperature to room temp. On a 20mm cube that's invisible. On a 150mm baseplate, that's over a millimeter of curl at each corner — enough to lift off any bed adhesive short of a nail gun. An enclosure isn't optional for ABS parts over about 80mm on the long axis; it's the difference between success and a scraper full of plastic potato chips.

PETG shrinks around 0.3–0.5%. We routinely print 250mm-long PETG parts flat on an open-frame machine with no enclosure and no drama. The bed does need release-layer help — PETG bonds to smooth PEI too well and will chip the sheet if you print directly on bare PEI without glue stick.

If you're on an open-frame printer, PETG is the correct answer 95% of the time, no matter what the part is. If you have an enclosed printer, ABS becomes viable, but you still want the chamber above 40°C for anything past a small print. Not sure which camp you're in? Our closed vs open 3D printers: 2026 buyer's guide walks through the choice.

Fumes and ventilation

ABS releases styrene as it prints. Styrene is a known irritant, and long-term inhalation isn't something you want to sign up for. Print ABS in a vented enclosure, a garage with the door cracked, or a room with real exhaust — never in a bedroom, never in a nursery, never in the room you sleep in.

PETG is effectively odorless in normal use. We've printed PETG on a desk in the same room as a sleeping toddler with no complaints from anyone. That alone tips the choice for a lot of home makers.

Print settings that actually work (2026)

Starting profiles that get you a good first layer without a slicer PhD. Both assume a hardened steel nozzle for high-flow work, or brass for standard speeds — PETG is not abrasive, and neither is standard ABS.

PETG starting profile

Nozzle: 235–245°C (245 for high-flow variants)
Bed: 70–80°C on smooth PEI, with glue stick or hairspray as a release layer
Fan: 30–50% after layer 3 (zero fan on first three layers)
Retraction: 1.0–2.0mm on direct drive, 4–5mm on Bowden. Stringing is PETG's one real weakness
Speed: 40–60 mm/s for functional parts, up to 200 mm/s on high-flow PETG on a capable machine

ABS starting profile

Nozzle: 240–260°C
Bed: 100–110°C
Chamber: 40–60°C (enclosure closed, top lid on, no fan blowing across the printer)
Fan: 0% for the first 20 layers, ≤20% after
Brim: 8mm minimum on any part over 50mm — belts and suspenders

Two tips that matter more than the numbers. Dry your filament. Both materials are hygroscopic; PETG especially prints beautifully when dry and pops and strings when wet. A cheap dryer beats every retraction tweak you'll ever make. For a deeper look at temperature choices across the material spectrum, we keep a running 3D printer nozzle temperature guide by material.

Post-processing: acetone smoothing and gluing

This is ABS's remaining party trick, and it's a real one. Vapor-smoothing an ABS print with acetone gives you a glass-smooth finish that no other common filament can match. Cosplay armor, display busts, prop replicas — ABS is still the answer if the final look matters more than the mechanical spec.

PETG shrugs off acetone entirely. Smoothing PETG means sanding through the grits, then either polishing or coating with a UV-cure resin. It's more labor and the result never quite matches vapor-smoothed ABS.

Both materials glue well with cyanoacrylate. For structural bonds — where you actually want the seam to be stronger than the layer line — 3D Gloop does what its name implies: it welds PETG-to-PETG and ABS-to-ABS chemically, and the joint is stronger than the print itself.

One quiet gotcha: PETG's ductility makes it harder to sand cleanly. It gums up the paper. Plan the finish you want before you press print — orient the part so the visible faces come off the nozzle already smooth.

Which one for your part? A decision tree

Skip the theory. If you know the part, this tells you the filament:

Outdoor bracket, mailbox part, garden tool → PETG. If UV exposure is brutal (Arizona rooftop), go ASA.
Engine bay clip, heat-gun holder, anything mounted near a motor → ABS.
Cosplay armor you plan to vapor-smooth → ABS.
Functional prototype, jig, fixture, GoPro mount, camera rig → PETG.
RC car body panel that needs to flex on impact instead of shattering → ABS.
Print on an open-frame machine in an unheated garage → PETG. Not a debate.
Print inside an enclosed printer, and the part needs HDT above 90°C → ABS.
First technical filament after PLA, no enclosure yet → PETG. Every time.

Which spool to buy from Forgely

Full disclosure: Forgely doesn't currently extrude our own PETG or ABS. Forgely Performance PLA is USA-made PLA, and that's it — for these two materials we stock the spools our own shop has tested and reordered. Here's the honest short list.

PETG pick:

Eryone PETG — the everyday functional-print spool. Consistent from run to run, prints clean on open-frame machines, priced to burn through a kilo without wincing.

ABS pick:

Eryone ABS — honest ABS for enclosed printers. Vapor-smooths nicely and lays down predictably at chamber temps around 45°C.

Outdoor upgrade:

Eryone ASA — same enclosure requirements as ABS, but it doesn't yellow or crack in UV. This is what we'd recommend for any outdoor part that will see a full year of sun.

If you're brand new to technical filament, start with the PETG. It covers the widest range of jobs, and if you can print PLA already you can print PETG this afternoon.

Common questions

Is PETG stronger than ABS? On tensile strength, yes — PETG lands around 50 MPa versus ABS's 40 MPa, and PETG's layer adhesion is markedly better. ABS wins on repeated-flex fatigue and heat resistance, not raw strength.

Can I print ABS without an enclosure? For small parts under 50mm on the long axis, sometimes. For anything larger, no — the shrinkage will curl the corners off the bed. If you don't have an enclosure, print PETG or upgrade the printer first.

Which is more waterproof, PETG or ABS? PETG. It absorbs less moisture and the layer adhesion is tighter, so water is less likely to wick through the print. Neither is truly waterproof out of the printer — both need extra wall count and, ideally, a coating for real water-holding jobs.

Does PETG melt in a hot car? It can soften. A black PETG part on a dashboard in a parked car in summer will deform. For phone mounts and dash accessories in hot climates, print ABS or ASA.

Is PETG or ABS better for outdoor use? PETG for most outdoor parts — it handles UV and moisture far better than ABS. If the part will also see high heat (100°C+ direct sun on dark surfaces), step up to ASA, which combines ABS's heat resistance with UV stability.

Can I smooth PETG with acetone? No. PETG is chemically resistant to acetone. Smooth it by sanding through grits, or coat with a UV-cure resin. If glass-smooth finish is the goal, print ABS instead.

Which is safer to print in a bedroom? PETG. It's effectively odorless and doesn't release styrene. ABS should only be printed in a ventilated enclosure or a separate ventilated room.

The bottom line

PETG for most functional prints, outdoor parts, and any open-frame printer. ABS when you specifically need heat resistance above 80°C, acetone smoothing, or maximum stiffness — and when you have the enclosure and ventilation to run it right.

Ninety percent of the parts coming off Forgely's own shop printers are PETG, and that's not an accident — it's the highest-utility technical filament on the market in 2026.

If you're loading a spool for your next real print, start with Eryone PETG. It's what we reach for first, and we'd tell you the same thing if we made ten cents more selling you something else.