PLA, PETG, ABS, ASA: these four materials cover 95% of everything most FDM makers will ever print. They’re not interchangeable. Each has a specific set of strengths, weaknesses, and ideal applications. Choosing the right one saves you failed prints, wasted filament, and parts that break when they shouldn’t. This is the complete comparison.
The Quick Answer: Which Filament to Use
Before the detail: here’s the one-line version for each material so you know where this is going.
- PLA: Default choice. Use it for everything that doesn’t need heat resistance or impact flexibility.
- PETG: Use it when PLA would crack, soften in heat, or lose chemical resistance.
- ABS: Use it when you need a smooth acetone-vapour finish or parts that survive high heat and you can print in an enclosure.
- ASA: Use it instead of ABS when parts will live outdoors or in direct sun. Better UV resistance, similar mechanical properties.
Everything below explains why.
Full Comparison Table
| Property | PLA | PETG | ABS | ASA |
|---|---|---|---|---|
| Print temp | 190-220°C | 230-250°C | 230-250°C | 240-260°C |
| Bed temp | 50-60°C | 70-85°C | 100-110°C | 90-110°C |
| Heat resistance | Low (60°C) | Medium (75°C) | High (90°C) | High (95°C) |
| Impact resistance | Moderate | Good | Good | Very good |
| UV resistance | Poor | Moderate | Poor | Excellent |
| Warping tendency | Low | Low-medium | High | High |
| Enclosure needed | No | No (helpful) | Yes | Yes |
| Paintability | Excellent | Good | Good (acetone smoothable) | Good |
| Odour during printing | Mild, sweet | Mild plastic smell | Strong, acrid | Strong |
| Approximate cost per kg | $15-$25 | $18-$28 | $18-$25 | $22-$35 |
PLA: Why It’s the Default
PLA (polylactic acid) is the most widely used FDM filament for good reason. It prints at the lowest temperature of any common FDM material (190-220°C), adheres reliably to most bed surfaces without an enclosure, and produces minimal odour during printing. It’s made from plant starch, which gives it a mild sweetness when hot rather than the sharp chemical smell of ABS.
For hobby and display printing, PLA is almost always the right choice. Deck boxes, cosplay props, dollhouse furniture, figurines, desk accessories: all of these benefit from PLA’s easy printability, wide colour range, and excellent paintability. Matte PLA variants add a surface texture that takes primer better than any other common material.
The limitations are real but specific. PLA softens around 60°C, which means it deforms if left in a hot car in Florida summer heat. It’s more brittle than PETG under impact, meaning it cracks rather than flexes when stressed sharply. For anything that lives outdoors or in heat, PLA is the wrong choice. For everything inside at room temperature, it’s correct.
More on PLA variants, colour ranges, and brand recommendations at the OreKo filament guide.
PETG: The Practical Workhorse
PETG (polyethylene terephthalate glycol) bridges the gap between PLA’s easy printability and ABS’s tougher mechanical properties. It’s impact-resistant rather than brittle, chemical-resistant to most household solvents, and handles heat up to about 75°C without deforming. It prints without an enclosure, though a draft-free environment helps with larger pieces.
The trade-offs are specific and worth knowing. PETG strings more than PLA and requires more retraction tuning to get clean results. It bonds aggressively to bare PEI beds, especially at higher temperatures: a thin glue stick layer on a smooth PEI plate before printing PETG prevents it fusing to the coating on removal. And PETG is harder to sand and prime cleanly than PLA, so for paintable props, PLA is still preferred.
Where PETG earns its place: flexible prop elements that need to bend rather than crack, functional mechanical parts that see real loads, parts that live in warm environments (outdoor item trays, car-mounted accessories), and food-adjacent containers (PETG is food-safe when printed hygienically, PLA is not considered food-safe).
The full PLA vs PETG breakdown with print settings for both is in the original PLA vs PETG comparison post. That post covers the two-material choice in depth; this one puts both in broader context with ABS and ASA.
ABS: The Veteran Material with Specific Strengths
ABS (acrylonitrile butadiene styrene) was the dominant desktop FDM material before PLA took over, and for a specific set of use cases, it still makes sense. Its heat deflection temperature is around 90°C, roughly 30°C better than PLA. It’s impact-resistant and tough. And it’s the only common consumer FDM filament that responds to acetone vapour smoothing, a technique that produces glass-smooth surfaces without sanding by exposing the finished print to acetone vapour in a sealed chamber.
The downsides have always been significant. ABS warps badly on open-frame printers, shrinking as it cools and lifting corners off the bed with force. Printing ABS reliably requires an enclosure to maintain ambient temperature around the print. It emits styrene during printing, a volatile organic compound with a strong acrid smell and potential health concerns at high concentration: good ventilation is mandatory, not optional.
In 2026, most hobby makers have replaced ABS with ASA for outdoor work (better UV resistance) or PETG for indoor high-temperature applications (easier to print). ABS remains relevant for the acetone smoothing technique and for applications where ABS-specific properties (like compatibility with acetone welding for joins) are genuinely needed.
ASA: ABS for the Real World
ASA (acrylonitrile styrene acrylate) prints similarly to ABS and matches its mechanical and heat resistance properties, with one crucial addition: excellent UV stability. Standard PLA, PETG, and ABS all degrade noticeably under prolonged UV exposure, becoming brittle and discoloured. ASA resists this well enough that it’s used for automotive exterior components and outdoor signage.
For South Florida makers, ASA is the answer to the outdoor printing problem. Garden markers, outdoor fixtures, car exterior accessories, anything permanently in direct sun: ASA is the right material. It warps like ABS and needs the same enclosure setup, but the UV performance justifies the extra printing complexity for parts that will actually live outside.
ASA costs slightly more than ABS per kilogram but the performance difference for outdoor use is large enough to make it the default choice when heat and UV resistance are both required.
Which Material for Which Application
| Application | Best Choice | Why |
|---|---|---|
| Deck boxes, display models | PLA (matte) | Easy to print, paintable, rigid, wide colour range |
| Cosplay props (painted) | Matte PLA body, PETG flex elements | Best paint adhesion, structural flexibility where needed |
| Dollhouse furniture | PLA or silk PLA | Detail resolution, colour accuracy, no mechanical loads |
| Functional brackets, clips | PETG | Impact resistance, doesn’t crack under load like PLA |
| Outdoor items, Florida sun exposure | ASA | UV stability, heat resistance, won’t yellow or become brittle |
| High-heat enclosures, car interior parts | ABS or ASA | 90°C+ heat deflection vs PLA’s 60°C |
| Flexible connectors, straps, hinges | TPU | None of the above four are flexible. TPU is the right material for flex. |
Frequently Asked Questions: PLA vs PETG vs ABS vs ASA
What is the strongest filament: PLA, PETG, ABS, or ASA?
It depends on the type of stress. For tensile strength (pulling apart), all four are broadly comparable. For impact resistance, PETG and ASA outperform PLA significantly. For heat resistance, ABS and ASA win at around 90-95°C versus PLA’s 60°C. PLA is actually stiffer than PETG under slow load, but PETG is tougher (absorbs more energy before fracturing). For most hobby applications, PETG is the practical upgrade from PLA when strength matters.
Can I print ABS without an enclosure?
You can try, but results are unreliable. ABS warps significantly on open-frame printers because the temperature differential between the hot first layers and the cooling upper layers causes the print to contract and lift. Small ABS parts sometimes print without warping. Anything larger than about 50x50mm on most open-frame machines will experience corner lifting. An enclosure that keeps ambient temperature around 40-45°C is effectively required for consistent ABS results.
Is ASA better than ABS?
For outdoor applications, yes. ASA’s UV resistance is significantly better than ABS, making it the right choice for anything in direct sunlight long-term. For indoor high-heat applications, both perform similarly. ASA costs slightly more but the outdoor performance gap justifies it if UV exposure is a factor.
Which filament is best for beginners?
PLA without question. It prints at the lowest temperature, warps least, smells least during printing, and is available in the widest range of colours. Start with PLA, print it well, then add PETG to your toolkit when you have a specific project that needs it.
Does PETG bond to PEI beds?
Yes, sometimes too well. PETG can bond chemically to bare smooth PEI at temperatures above 70°C and pull up the PEI coating on removal. Apply a very thin layer of glue stick (Elmer’s purple washable) as a release agent on smooth PEI before printing PETG. Textured PEI is more forgiving. More on bed adhesion at the OreKo bed adhesion guide.
