PLA vs PETG: Which Is Better for Your Part?
PETG is not simply stronger. The manufacturer’s own data, side by side, and the plastic that wins for what your part has to survive.
PETG gets called the stronger plastic so often that most people take it as settled. The manufacturer’s own test data says something more useful. PLA is stiffer, slightly stronger when pulled, and harder to split between its layers. PETG copes with far more heat and takes a harder knock along its layers. Which one wins depends on what the part has to survive, so start there.
What does the part have to survive?
Print it in
PLA
Indoors, under a load, stiffness matters most and PLA is about 70% stiffer, a little stronger, and cheaper per gram. It also comes in far more colours.
| Property | PLA | PETG |
|---|---|---|
| Stiffness (bending modulus)How much it flexes under a load. PLA is about 70% stiffer. | 2,750 MPa | 1,610 MPa |
| Tensile strength, along layers | 35 MPa | 33 MPa |
| Bending strength, along layersLoad before it snaps when bent. | 76 MPa | 68 MPa |
| Impact, along layers | 26.6 kJ/m² | 37.4 kJ/m² |
| Impact, across layers | 13.8 kJ/m² | 7.2 kJ/m² |
| Holds its shape to | 57 °C | 74 °C |
| Stretch before breaking | 12.2 % | 8.2 % |
| Water it absorbs | 0.43 % | 0.30 % |
Bambu Lab’s data sheets: PLA Basic V3.0 and PETG Translucent V1.0, the PETG on our rack. Lab test bars, not a promise for any one part.
The short answer
For most products that live indoors, PLA is the better plastic, and it is the cheaper one.
The exceptionAnything that lives in a hot car, in direct sun, or next to something warm. That is where PLA softens and PETG does not.
Where each one wins
- PLA
- Stiff, crisp and detailed. Holds a load without flexing, comes in far more colours and finishes, and costs less per gram. Best for desk pieces, home goods, organisers, stands, display pieces and most gifts.
- PETG
- Holds its shape to 74 °C against PLA’s 57 °C and takes about 40% more of a knock along its layers. Best for parts in cars and sunny windows, outdoor fittings, and things that get banged about.
- Neither
- Anything that sits on a car dashboard in summer, which reaches about 69 °C. Use PETG-CF or ABS, which hold their shape to 74 °C and 87 °C.
The layer problem both share
A 3D print is built from stacked layers, and every plastic is weaker across them than along them. PETG feels it more. Struck along its layers, PETG takes 37.4 kJ/m² before it breaks against PLA’s 26.6. Struck across them, PETG takes 7.2 and PLA 13.8, nearly twice as much. So a PETG part printed the wrong way up can be the weaker of the two.
The fix is orientation, not a different plastic. A part should be laid on the printer so its working load, the bend of a hook or the flex of a clip, runs along the layers. If you are replacing a broken part, this guide picks the plastic and the orientation for the job. For every material we stock, including TPU, see the materials guide and materials for parts people handle every day.
What it looks like
PLA prints with sharp edges and a dry, even surface, in solid colours, matte, silk and wood finishes. The PETG on our rack today is translucent, with a soft gloss that lets light through, which suits lamp shades, light covers and anything that should glow. If you need PETG’s heat resistance with an opaque, technical finish, PETG-CF has carbon fibre in it and a matte, technical surface.
FAQ
Not simply. In Bambu Lab’s test data PLA is about 70% stiffer and slightly stronger in tension. PETG takes about 40% more impact along its layers but only about half as much across them. PETG’s clear advantage is heat: it holds its shape to 74 °C against PLA’s 57 °C.
PETG, because a part in the sun runs hot and PLA softens around 57 °C. For a car dashboard, which reaches about 69 °C in summer, use PETG-CF or ABS instead.
PLA. On our rack it costs less per gram. Most of the price of a small print is printer time, so the gap on a finished part is smaller than the per-gram prices suggest.
For most indoor products, PLA: it is stiffer, more detailed, cheaper and comes in far more colours. Choose PETG for parts that must cope with heat or frequent knocks.
Pick the plastic when you upload.
PLA, PETG, PETG-CF, ABS and TPU on the rack, each priced per gram at cost. Every part checked by hand before it ships.
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