PLA vs PETG vs ABS: Which Filament for Which Job?
Contents
The question to ask before printing a part is: where will this part be used? A figure that sits on a desk and a car-interior holder that sits in the sun have different needs. PLA is easy to print and ideal for indoor use. PETG is tougher and more resistant to moisture. ABS is the most heat resistant but needs an enclosure and ventilation.
Quick comparison
| Feature | PLA | PETG | ABS |
|---|---|---|---|
| Ease of printing | Very easy | Easy to medium | Hard |
| Nozzle temperature (approx.) | 190–220 °C | 230–250 °C | 230–260 °C |
| Bed temperature (approx.) | 50–60 °C | 70–85 °C | 95–110 °C |
| Softening temperature (approx.) | 55–60 °C | 75–80 °C | 95–105 °C |
| Impact strength | Low, brittle | Medium to good | Good |
| Flexibility | Stiff | Slightly flexible | Slightly flexible |
| UV / outdoors | Poor | Medium | Poor (ASA preferred for UV) |
| Smell and emissions | Very little | Little | Noticeable, ventilation a must |
| Warping tendency | Low | Low | High |
| Stringing | Little | Noticeable | Little to medium |
| Enclosure | Not needed | Not needed | Recommended |
| Post-processing | Sanding, painting | Hard to sand | Easy to sand, can be smoothed with acetone vapor |
Temperature values are approximate. Always go by the recommendation on the filament box, and verify with a temperature tower.
PLA
PLA (polylactic acid) is a thermoplastic made from plant sources such as corn and sugarcane.
Strengths:
- Prints at a low temperature, with very little warping and odor.
- Gives sharp details and clean surfaces.
- A very wide choice of colors and special effects: silk, matte, metallic, wood-filled.
- The most forgiving material for beginners.
Weaknesses:
- Softens at around 55–60 °C. It deforms in a car left in the sun or where it touches hot water.
- It is brittle and breaks instead of flexing under impact.
- It can slowly change shape under load for a long time (creep).
Good for: Figures, models, prototypes, desk organizers, boxes, indoor decoration.
PLA+ / Tough PLA: PLA types with additives that improve impact strength. Heat resistance usually stays close to standard PLA.
PETG
PETG is PET, the plastic used in water bottles, modified with glycol.
Strengths:
- Tougher than PLA, it bends instead of breaking under impact.
- Heat resistance is clearly higher than PLA.
- Resistant to moisture, many chemicals and oils.
- Very strong bond between layers.
- Does not smell like ABS and needs no enclosure.
Weaknesses:
- Prone to stringing.
- Absorbs moisture quickly. Wet PETG prints bubbly and uneven, so drying matters.
- Can stick very strongly to a smooth PEI bed and tear pieces off the surface. Use a thin layer of adhesive as a release agent.
- Does not give results as clean as PLA on sharp bridges and overhangs.
Good for: Mechanical parts, brackets, holders, outdoor parts that stay in shade, parts that touch water outside the kitchen. See the PETG printing guide.
ABS
ABS (acrylonitrile butadiene styrene) is the engineering plastic LEGO bricks and many plastic products are made of.
Strengths:
- Heat resistant, keeps its shape up to 95–100 °C.
- Resistant to impact.
- It can be sanded and drilled, and a glossy surface can be achieved with acetone vapor.
Weaknesses:
- Shrinks a lot as it cools. Warping and layer cracking are common.
- It has to be printed in an enclosure.
- It gives off a noticeable smell and fine particles while printing. A ventilated space is a must.
- Yellows and turns brittle in UV light over time.
Good for: Car interior parts, brackets used in hot places, functional parts that need high heat and impact resistance.
For detailed print settings: ABS printing guide.
ASA: Prints very much like ABS but resists UV far better. For parts that see sun outdoors, choose ASA instead of ABS.
Which should I choose?
| How the part is used | Suggestion |
|---|---|
| Decorative, figures, models | PLA |
| Functional part indoors | PLA+ or PETG |
| Part that takes impacts or bends | PETG |
| Inside a car, in the sun | ASA or ABS |
| Part in the sun outdoors | ASA |
| Flexible, rubber-like part | TPU (see the TPU printing guide) |
| Quick prototype | PLA |
About food contact
Even if the filament itself is sold as "food safe", the tiny gaps between FDM print layers can harbor bacteria. Brass nozzles may also contain lead, and color pigments may contain unknown substances. 3D printing is not recommended for parts that will have direct, repeated contact with food.
Which filament should a beginner start with?
Start with PLA. Once your settings are dialed in, move to PETG for functional parts.
I do not have an enclosure. Can I print ABS?
Small parts can be printed, but warping and cracking are unavoidable on larger parts. Without an enclosure, think of PETG for parts that need heat resistance, or ASA with an enclosure.
Why does PETG not come off the bed?
PETG sticks very strongly to smooth PEI and glass surfaces. Try removing it after the bed has cooled completely. Next time, put a thin coat of adhesive on the surface to form a release layer.