Filament Guide
PETG Filament Guide
The practical workhorse. Tougher and more durable than PLA.
Last updated: July 2026
TL;DR
- Best all-rounder for functional parts at 220-250°C, no enclosure needed, handles 80°C
- Strings more than PLA but sands, drills, and taps well for mechanical assemblies
- Food-safe options exist (same base polymer as water bottles) but FDM layer lines need sealing
- Slight flex makes it tougher than PLA under impact, so it won't shatter on drops
PETG
Polyethylene Terephthalate Glycol-modified
The practical workhorse. Tougher and more durable than PLA.
Beginner-Intermediate
Very Popular
PETG is a modified form of PET - the same plastic used in water bottles - with glycol added during polymerisation to prevent the crystallisation that makes standard PET brittle and hard to print. The result is a semi-crystalline thermoplastic that combines decent toughness, chemical resistance, and heat resistance while remaining easier to print than ABS or Nylon.
PETG was adopted into FDM printing in the early 2010s and has become the second most popular filament after PLA. It sits in a sweet spot: meaningfully stronger and more temperature-resistant than PLA, but without the warping headaches of ABS.
Its main quirk is stringing - PETG is "sticky" and oozes more than PLA, requiring careful retraction tuning. It's also slightly flexible, which can be a pro or con depending on the application.
Chemistry
Polyester - PET modified with glycol comonomer to suppress crystallisation
Print Temp
Heat Resistance
Softens at ~80°C[2] - survives car interiors on most days
Food Safe?
Base material is, but layer lines harbor bacteria. Not safe without coating.
Chemical Resistance
Good vs. water, weak acids. Attacked by ketones and strong solvents.[1]
UV Resistance
Better than PLA, worse than ASA. Degrades over years of outdoor exposure.
Pros
- Much tougher and more impact-resistant than PLA
- Good heat resistance for everyday use (~80°C)
- Very little warping - no enclosure needed
- Slight flexibility adds durability
- Good layer adhesion and interlayer strength
- Decent chemical resistance
- Transparent/translucent variants print beautifully
Cons
- Strings aggressively - retraction tuning required
- Sticks too well to PEI/glass if overheated
- Softer surface - scratches more easily than PLA
- Absorbs moisture - needs drying if stored open
- Not as stiff as PLA - flex can be unwanted
- Harder to sand and post-process
Best Used For
Mechanical parts
Outdoor enclosures
Water containers
Snap-fit parts
Electronics housing
Living hinges
RC car components
Aquarium parts
Light pipes / diffusers
Niche Tips
Bed adhesion paradox
PETG sticks too well to bare PEI. Use a PEI sheet with a thin layer of glue stick or hairspray, or print on a cool textured sheet.
Transparency
Clear PETG at 0.1mm layers with near-zero fan speed produces genuinely translucent parts - great for light diffusers and lamp shades.
Moisture sensitivity
PETG is more moisture-sensitive than PLA. If you hear crackling or see foam/bubbles in the extrusion, dry at 60-65°C for 8 hours.
Stringing fix
Lower print temp by 5-10°C, increase retraction distance, enable "wipe on retract." Combing mode helps too.
Storage & Humidity
Target: below 25% RH
PETG is a moderate moisture absorber. Unlike PLA, moisture visibly degrades quality within hours of open-air exposure in humid environments - expect stringing, bubbling, and reduced layer bonding.
Drying wet PETG
60-65°C for 8 hours. PETG's higher Tg (glass transition temperature) allows drying at higher temps than PLA without spool deformation.
Dry before tuning retraction
If stringing suddenly gets worse on a roll that's been sitting out, dry it before touching retraction settings. Wet PETG strings like crazy.
Bed Adhesion
Best surfaces
Textured PEI with glue stick, BuildTak, glass with hairspray. PETG is unusually sticky and needs a release agent on smooth PEI.
Critical warning
PETG on bare smooth PEI without a release agent can bond so strongly it tears the PEI sheet surface when removed. Always apply a thin glue stick layer or hairspray before printing PETG on smooth PEI. This is one of the most common expensive mistakes in 3D printing.
Recommended bed temp
70-85°C.
Release
Wait for full cool-down to room temperature - PETG tears and leaves residue if removed warm. If still fused after cooling, place the build plate in the freezer for 10 minutes.
The PETG Grade Ladder
PETG has quietly grown the same designator system as PLA: HS- for speed-tuned, HT for heat-stable, + for toughened, -CF/-GF for fiber fills, r- for recycled. Two oddballs live in this family too: Fillamentum’s CPE copolyesters and Spectrum’s HT100. The ladder, with live listings:
PETG
The workhorse grade. Tougher than PLA, mildly flexible, shrugs off water and UV well enough for outdoor brackets. Strings if you look at it wrong; dry it and slow travel moves down. Most of the PETG market is still this tier.HS-PETG (Rapid)
Speed-tuned PETG for the fast-printer generation; already roughly one in five PETG listings. Same stringing caveats as regular PETG, amplified by speed, so part cooling and drying matter more, not less. Elegoo Rapid PETG and Eryone High-Speed dominate the listings here.PETG+
Toughened PETG, mostly eSUN’s doing. Better impact resistance and slightly easier printing than their standard line, priced barely above it. An easy default if you were buying eSUN anyway.HT-PETG (Spectrum HT100)
The heat-stable outlier: Spectrum’s HT100 holds shape to around 100°C heat deflection, roughly double standard PETG territory and into ASA range, without needing an enclosure. Niche and priced like it, but if you want one PETG that survives a car dashboard, this is it.PETG-CF / PETG-GF
Fiber-filled PETG: much stiffer, matte, dimensionally calmer than plain PETG, and kinder to print than PLA-CF because the base is less brittle. The usual fiber rules apply: hardened nozzle, dry it religiously, expect weaker layer bonds.CPE HG100
Fillamentum’s high-gloss copolyester, a premium PETG-family material with a finish somewhere between injection molding and glass. Their quoted colourways (“Lagoon”, “Iced Green”) are half the appeal. Costs like the boutique material it is.PETG-ESD / PETG-V0
Engineering niches: ESD grades dissipate static for electronics handling; V0 grades carry a UL94 V-0 flame rating for enclosures and anything near mains. You buy these because a spec sheet says so, not for fun.PETG-Lite / r-PETG
Budget and recycled tiers, same story as their PLA cousins: fewer colors, plainer spools, standard printing behaviour. Fiberlogy’s r-PETG is the most consistent recycled PETG we track.Variants & Special Types
PETG ProPremium PETG with better flow consistency and reduced stringing. Generally easier to dial in than standard PETG.
PETG RapidOptimized for faster printing with modified flow characteristics. Maintains layer adhesion at higher speeds.
PETG-CFPETG with chopped carbon fiber. Increased stiffness, reduced warping, matte finish. Popular for drone frames and structural brackets. Hardened nozzle required.
PETG ESDElectrostatic dissipative PETG for electronics environments. Better chemical resistance than PLA ESD, making it suitable for industrial settings.
PETG FX120High-temperature PETG variant with higher heat deflection than standard PETG. Bridge between PETG and engineering materials.
PETG V0 / FRFire-rated PETG meeting UL94 V0 flame classification. For enclosures near heat sources or applications requiring fire safety certification. Significantly more expensive.
Brand picks: what the community uses
Most-mentioned budget PETG
Elegoo PETG & eSUN PETG (~$10-14/kg) are the two named most often in “which PETG is reliable” threads. Both print on Cura's stock PETG profile with no tuning. eSUN tends to be more affordable in EU through 3DJake; Elegoo has wider color selection. See best-value PETG picks.
Matte PETG
SUNLU PETG Matte & Polymaker PolyTerra PETG (~$13-18/kg). Eliminates the glossy/translucent look without sacrificing strength. SUNLU is the affordable global option; PolyTerra commands a $4-5/kg premium for tighter QC.
PETG-CF for structural use
Polymaker PolyMide PETG-CF & Bambu PETG-CF (~$25-40/kg). Carbon-fibre fill dramatically increases stiffness and dimensional stability. Use these for drone frames, RC suspension, structural brackets. Hardened steel nozzle required, since brass wears in 2-3 prints.
High-speed PETG
Bambu PETG HF (~$23/kg) is tuned for high flow rates on the X1C/P1S/H2D. SUNLU PETG-HS (~$15/kg) is the budget alternative. Standard PETG caps around 120 mm/s before quality drops; HF/HS variants double that.
Premium pick (per-spool QC)
Prusament PETG (~$30/kg) ships with a per-spool diameter spec sheet, consistent flow, and rare color-batch variation. Worth the premium for parts you'll sell or where dimensional consistency matters more than price.
Printer-specific PETG tips
Bambu Lab (X1C, P1S, A1, H2D)
The Bambu Generic PETG profile handles every reputable budget brand without tuning. The AMS feeds PETG, but the softer polymer is more sensitive to diameter consistency than PLA, so stick with named brands (Bambu, Polymaker, Elegoo, SUNLU) on the AMS. Speed cap on standard PETG is ~180 mm/s; Bambu PETG HF handles 250+. For multi-material PETG/PLA prints, use separate purge towers, because PETG’s slower cooling causes uneven bonding.
Prusa MK4S, MK3S+, Mini+
Prusa printers are tuned for PETG out of the box. The Prusament PETG profile prints any decent PETG cleanly. Direct-drive helps with PETG retraction (set 0.6-1.0mm at 30 mm/s). For the Mini, drop print speed to 60 mm/s for the first layer; PETG bonds aggressively to the smooth PEI on Mini and a slow first layer prevents pull-up on removal. Watch moisture, because the unsealed enclosure means PETG absorbs humidity in 2-3 weeks.
Creality Ender 3 family
Bowden Enders are the printer-PETG combination that gets the most stringing complaints. Set retraction to 5-6mm at 25 mm/s and drop print temp 5-10°C from the spool's recommended range. A Capricorn PTFE tube ($10) noticeably reduces PETG retraction issues on stock Bowden, since the tighter inner diameter holds filament more securely. PLA prints fine either way; this is purely a PETG investment.
Voron / V-Core / DIY CoreXY
Voron handles PETG well at speed because input shaping reduces ringing. Run pressure advance higher than your PLA value (typical Voron PA for PETG is 0.04-0.06 vs 0.025-0.04 for PLA) to compensate for PETG’s higher viscosity. Bambu PETG HF and SUNLU PETG-HS print cleanly at 250-300 mm/s on a tuned Voron. For ERCF setups, prefer Polymaker PolyMide or Prusament PETG, since the tighter QC pays off when filament has to survive cutter pressure.
Common PETG pitfalls (and how to avoid them)
Stringing on every travel move
The single biggest PETG complaint, almost always one of two causes: wet filament, or print temperature too high. Dry the spool first at 65°C for 4-6 hours in a filament dryer or food dehydrator. If stringing persists, drop nozzle temp 5°C at a time until it stops. Most spools recommend 230-250°C; the actual sweet spot for clean prints is usually 5-10°C below the recommended ceiling.
Print stuck to the bed, chips PEI on removal
PETG bonds to smooth PEI almost too well. Fix: textured PEI releases PETG cleanly once the bed cools to room temp. If on smooth PEI, apply a thin layer of glue stick (Elmer’s purple) before printing as a release layer. Don’t print PETG directly on bare glass, as it can crack the glass on removal.
Layer separation in walls / weak interlayer bonding
If a finished print pulls apart at layer lines under modest stress, the cause is usually print temperature too low or layer time too short. Bump nozzle temp 5°C and slow down minimum layer time to 8-12 seconds in your slicer. Don’t over-cool with the part fan; PETG wants 30-50% fan speed, not 100% like PLA.
Fuzzy surface / popping sounds during printing
Wet PETG, full stop. PETG absorbs moisture faster than PLA, so if your shop is over 50% RH, expect to dry every spool that’s been open for more than 2 weeks. The popping sound is water vapor exiting the nozzle. Spool-mount filament dryers (eSUN eBox, Polymaker PolyDryer) let you print directly from the dryer; worth the $80 if you print a lot of PETG.
First layer pulls up on bowden setups
Bowden Enders + smooth PEI + PETG is a classic combo for pull-up. Either upgrade to textured PEI ($15) or apply glue stick. Direct-drive printers handle PETG first layers more reliably because there's less pressure delay during the slow first-layer pace.
When PETG isn’t the right choice
PETG is the most versatile filament most makers print, but it isn’t the right answer for everything.
Sustained heat above 80°C → ASA, ABS, or PC
PETG softens around 75-80°C continuous. For under-hood automotive, near heat-emitting electronics, or industrial use, jump to ASA (~95°C) or polycarbonate (~120°C).
High-detail miniatures → PLA (matte)
PETG smooths over fine surface detail because the polymer stays sticky longer than PLA. For miniatures, mechanical models, or anything with fine geometry, PLA matte gives a sharper result. PETG is for function, not detail.
Repeat flex / springy parts → TPU
PETG flexes a few thousand cycles before fatigue. For parts that bend repeatedly (phone cases, gaskets, springs), TPU is the right floor, handling tens of thousands of cycles without failure.
Permanent outdoor / UV exposure → ASA
PETG handles outdoor for 1-2 years before noticeable yellowing. For permanent outdoor parts (mailbox numbers, planters, exterior signage), ASA was developed specifically for UV resistance and lasts indefinitely.
Maximum strength → PA-CF or PEEK
Even PETG-CF has limits. For real load-bearing parts (industrial robotics, structural drone components, parts replacing machined aluminium), polyamide-based composites (PA-CF, PA12-CF) and PEEK are the upgrades.
References
- Prusa Knowledge Base - PETG. Print temperatures, chemical resistance, and material properties. help.prusa3d.com/article/petg_2059
- Bambu Lab Wiki - Filament Guide Material Table. Glass transition temperatures and printing parameters for common filaments. wiki.bambulab.com/en/general/filament-guide-material-table
Frequently Asked Questions
Is PETG food safe?
PETG is the same polymer used in soda bottles and food packaging (PET), which is FDA-approved for food contact at the polymer level. But FDM-printed PETG has layer lines and microscopic gaps that harbour bacteria and resist cleaning, plus most colored filaments add dyes that aren’t food-grade certified. PETG is fine for single-use food contact (cookie cutters, funnels, pour spouts). For reusable food storage, use food-rated filament or seal prints with food-safe epoxy.
Does PETG need an enclosure?
No. PETG warps far less than ABS and prints reliably in open air at typical room temperatures. An enclosure is unnecessary for almost all PETG work. Very large parts (300mm+) or drafty environments may benefit, but it’s not a requirement. PETG’s lack of enclosure need is one of its key advantages over ABS.
Why does my PETG string so much?
PETG has a wider melting range than PLA, so the polymer stays sticky longer as it cools and residual nozzle pressure keeps oozing during travel moves. Three things fix it: (1) dry your filament, since wet PETG strings 5× more than dry; (2) bump retraction +1mm above your PLA setting (4-6mm for Bowden, 0.6-1mm for direct drive); (3) drop print temp 5-10°C from the spool’s recommended range. Most stringing complaints come down to wet filament, not retraction tuning.
Can PETG be used outdoors?
Yes for 1-2 years; not for permanent installations. PETG has better UV resistance than PLA but isn’t fully UV-stable. For short-term outdoor use (a season or two), PETG works well and handles rain, temperature swings, and a parked-car interior. For permanent outdoor parts (mailbox numbers, signage, garden hooks that should last 5+ years), ASA was developed specifically for UV resistance. Dark PETG holds up better than clear or white outdoors.
Why is my PETG print stuck to the bed?
PETG bonds to smooth PEI almost too well, so prints can pull chunks of the sheet off on removal. The fix: textured PEI (the standard on most modern printers) releases PETG cleanly once the bed cools to room temp. If you’re on smooth PEI or glass, apply a thin layer of glue stick (Elmer’s purple) before printing as a release layer. Don’t print PETG directly on bare glass, as it can crack the glass.
What temperature does PETG handle?
PETG’s glass transition (Tg) is around 75-80°C, significantly higher than PLA’s 60°C and the right floor for hot car interiors, near-electronics use, and dishwasher cycles. For sustained use above 80°C (engine bay, industrial heat), step up to ASA (~95°C) or polycarbonate (~120°C). PETG is the right answer when PLA isn’t enough but you don’t want ABS-level print difficulty.
Does PETG need drying?
More often than PLA, yes. PETG is more hygroscopic and can pick up enough moisture in 2-3 weeks of humid storage to start stringing badly. Dry at 65°C for 4-6 hours when symptoms appear (popping sounds, lots of stringing, brittle prints). Vacuum bag with desiccant for long-term storage. PETG drying temp can be higher than PLA’s because PETG has higher heat resistance and won’t deform at 65°C. See our filament storage guide.
Best PETG for Bambu Lab printers?
Bambu PETG HF (their high-flow variant) is the safe choice, tuned for the AMS and printing at full Bambu speeds. For budget, Elegoo PETG and SUNLU PETG both run cleanly on Bambu’s Generic PETG profile. Avoid no-name PETG on the AMS, because PETG’s softer polymer compresses under feed pressure and triggers sensor false-positives more than PLA does. For external spool feed, any decent PETG works.
PETG vs PETG-CF: when is the carbon fibre version worth it?
PETG-CF adds chopped carbon fibre for stiffness and dramatically better dimensional stability under load. Worth it for drone frames, RC parts, and structural brackets, anything where flex under load would compromise the part. Not worth it for general functional prints where regular PETG already handles the job. PETG-CF requires a hardened nozzle (carbon fibre eats brass nozzles in 2-3 prints). See our carbon fibre filament guide.
How does PETG compare to PLA for everyday use?
PLA is easier to print, prints faster, and gives better surface finish on detail work. PETG handles heat, moisture, UV, and impact better. The right pick depends entirely on what the part will do. For indoor decorative or display, PLA wins; for functional, outdoor, or mechanical-stress parts, PETG wins. Most makers keep both on hand. See PLA vs PETG for the full breakdown.
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