ABS vs PETG: Which Should You Print With?
ABS and PETG are both tougher than PLA. PETG prints easily on open printers; ABS needs an enclosure but can be smoothed with acetone. Here is how to choose.
By Sepehr Sabbagh-pour · Published 10 October 2026 · 7 min read
ABS and PETG are both tougher than PLA, and both are common for functional parts. The big difference is how they print: ABS wants a hot, enclosed, ventilated setup and warps easily, while PETG prints on an open machine with little warping. This page compares them using Prusa's material guides and Prusament data. It is research from manufacturer documentation, not our own side-by-side print tests.
The short answer
- Choose PETG if you have an open-frame printer, want fewer failures, or are printing large parts. Prusa's own guide recommends swapping ABS for PETG when a print covers most of the bed.
- Choose ABS if you need acetone smoothing or gluing, and you have an enclosure and good ventilation.
- If the part will live outdoors in sunlight, look at ASA instead of ABS.
ABS vs PETG side by side
Figures are from Prusa's knowledge base for each material, its filament material table and the Prusament PETG page. Other brands list different ranges, and the label on your spool comes first.
| ABS | PETG | |
|---|---|---|
| Nozzle temperature | 255 °C recommended; 230 to 255 °C in Prusa's table | 230 to 240 °C in Prusa's guide; 215 to 270 °C in Prusa's table |
| Bed temperature | 100 °C recommended; 80 to 110 °C depending on object size | 85 to 90 °C in Prusa's guide |
| Enclosure | Recommended; Prusa says it should be printed inside one | Not required |
| Warping | Significant | Very little |
| Shrinkage | Around 1 to 2% after cooling, according to Prusa | Low thermal expansion |
| Layer cracking | Highly susceptible if cold air hits the print | Prusa says it does not share ABS's tendency to crack or delaminate |
| Fumes | Potentially dangerous fumes (styrene); print in a ventilated room | Prusament lists it as mostly odorless |
| Heat resistance | Described as good; Prusa's page gives no number | Below 80 °C per Prusa's guide; 68 °C on the Prusament page |
| UV and outdoors | Lacks UV resistance; turns yellowish and more brittle outdoors | Water and humidity resistant; suitable for most outdoor use |
| Acetone smoothing | Yes, and acetone can also glue parts | No |
| Stringing and overhangs | Not flagged as weak points | Prone to stringing; poor bridging and overhangs |
Printing difficulty
PETG is the easier of the two. Prusa describes it as one of the most easily printable materials, and Prusament lists printing difficulty as easy to medium. ABS needs a bed of at least 100 °C and a printer inside an enclosure to hold the ambient temperature, and Prusa calls out significant warping as its main disadvantage. Without an enclosure, it suggests the slicer's draft shield, which builds a wall around the object to keep it slightly warmer.
Prusa also warns that printing inside a hot enclosure can deform the fan shroud and other plastic printer parts. See enclosed vs open-frame printers, and our settings page for ABS print settings.
Strength and heat
Prusa calls ABS a tenacious, temperature-resistant material for mechanically stressed parts, and lists high tenacity and good high-temperature resistance as strengths. It describes PETG as tough and durable, with relatively high tenacity and temperature resistance, plus good layer adhesion. On heat, PETG numbers are the easier ones to find: below 80 °C in the guide, 68 °C on the product page. Leave a margin and do not run either material near its limit. Check the data sheet for the exact ABS filament you buy, because brands differ.
Cracking and layer separation
Layer cracking is where the two diverge most. Prusa says ABS is highly susceptible to layer separation when cold air blows on the print before it has cooled, recommends turning fans off completely for ABS and suggests printing it in an enclosure. For big parts it goes further, saying it is better to replace ABS with PETG, which has similar advantages and is much better for large objects. See how to fix ABS cracking if you stay with ABS.
Finishing
ABS is the better-known choice for finishing. It sands wet or dry, smooths with acetone vapor to a glossy surface and glues with acetone. Prusa says acetone-smoothed parts lose some sharp detail, and warns against putting acetone or ABS juice on powder-coated sheets. PETG sands easily, but Prusa says dissolving or smoothing it needs dangerous chemicals in a laboratory, so assume it cannot be smoothed at home.
Bed adhesion and surface
Both can grip a smooth PEI sheet hard. Prusa says to use a glue stick on smooth PEI for either material. PETG in particular bonds strongly, so Prusa advises a powder-coated sheet. For ABS, Prusa recommends the smooth or powder-coated PEI sheet with a glue stick.
Safety
Prusa says ABS releases fumes and substances that could pose a potential health risk, and tells users to print in a well-ventilated room without creating a draft around the print. Follow the manufacturer's guidance and the Safety Data Sheet for the specific filament you use. Our 3D printer safety basics page covers general precautions.
Which should you pick?
A simple rule. Default to PETG for a tough part on an open printer. Pick ABS only when you need acetone smoothing or gluing, or when you already print in an enclosed, ventilated setup. For long sun exposure, consider ASA rather than either.
For more on the middle ground, read what is PETG and PETG vs PLA. The wider comparison is in PLA vs PETG vs ABS vs TPU.
Frequently asked questions
Is ABS stronger than PETG?
Both are tough. Prusa lists high tenacity and good temperature resistance for ABS and describes PETG as tough and durable with good layer adhesion. The real difference is printing: ABS cracks and warps more, which can make PETG parts stronger in practice.
Do I need an enclosure for ABS or PETG?
Prusa recommends an enclosure for ABS and lists PETG as not requiring one. Without an enclosure, a draft shield in the slicer can reduce ABS warping.
Can PETG replace ABS?
For many parts, yes. Prusa suggests replacing ABS with PETG for large objects because PETG has similar advantages and does not crack as easily. It cannot replace ABS where you need acetone smoothing or gluing.
Is ABS or PETG better outdoors?
PETG. Prusa says ABS lacks UV resistance and turns yellowish and brittle outdoors, while PETG is water and humidity resistant. For sunlight, check ASA, which Prusa describes as more UV resistant than ABS.
Sources
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Software engineer since 2009 and Head of Engineering by day, a maker who has owned several 3D printers, writing practical guides to 3D printers, filament and running costs, with every article saying what was and was not tested.
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