PLA and PETG are the two filaments most people print with. Both work on almost any printer, neither needs an enclosure, and both are cheap. The difference is in how easy they are to print and how the finished parts hold up.
About this guide: temperatures and heat figures are from Prusa’s data for its Prusament PLA and PETG, checked in October 2026. Other brands are similar but not identical, so always check the label on your spool.
The short answer
- Use PLA for most things: models, toys, organizers, prototypes and anything that stays indoors. It is the easiest filament to print.
- Use PETG for parts that need to be tougher, bend a little instead of snapping, or handle more heat, like brackets, outdoor parts and things in a warm car or near a window.
Side by side
| PLA | PETG | |
|---|---|---|
| Ease of printing | Easiest | Easy, but strings more |
| Nozzle temperature | About 215 °C | About 250 °C |
| Bed temperature | 50–60 °C | About 80 °C |
| Part cooling fan | 100 % | Around 50 % |
| Heat resistance | Softens from about 55 °C | Holds up to about 68 °C |
| Toughness | Stiff, but can snap | Tougher, bends before it breaks |
| Surface | Crisp details, matte or glossy | Glossier, slightly less crisp details |
| Enclosure needed | No | No |
When to choose PLA
PLA is forgiving. It sticks well to the bed, barely warps and gives sharp details, so it is the right choice for your first prints and for most decorative or indoor parts. Its weak spot is heat: Prusa’s data shows PLA starting to soften at around 55 °C, so a PLA part can deform on a car dashboard in summer.
When to choose PETG
PETG is the step up when PLA is not tough enough. It is less brittle, handles more heat and is a better pick for functional parts and things that live outside. Prusa itself recommends PETG or ASA over PLA when a part needs better heat resistance.
Tips for printing PETG
- Expect some stringing. PETG strings more than PLA. Tuning retraction and printing a little cooler helps.
- Keep it dry. PETG absorbs moisture from the air, which causes more stringing and bubbles. Store it sealed, or dry it before printing.
- Watch the bed surface. On smooth PEI sheets PETG can stick so well that it damages the surface. A textured sheet, or a thin layer of glue stick as a separator, prevents that.
- Use less cooling. Too much fan makes PETG layers bond less well.
What about other filaments?
ABS and ASA handle even more heat, and ASA is very UV resistant, but both print best in an enclosed printer. TPU is flexible, for things like phone cases and seals. If you want those materials, see our best enclosed 3D printers.
Verdict
Start with PLA. Switch to PETG when a part has to be tougher or survive heat. Most people end up keeping both on the shelf.
Frequently asked questions
Which filament should I start with?
PLA. Prusa calls it one of the easiest materials to print and lists good detail and little warping among its strengths. Prusa’s PLA profile uses 215 °C for the first layer, 210 °C after that, and a 60 °C bed.
The weak point is heat. Prusa says PLA gets soft and deforms above 60 °C and breaks down in UV light, so it is a poor choice for parts that sit in a car or outdoors. In beginner threads, the usual advice is to print with PLA until you are comfortable and move to PETG once a part has to handle heat or bending. Our PLA vs PETG guide covers that step.
Sources: Prusa Knowledge Base.
What is the difference between PLA and PLA+?
PLA+ (also sold as PLA Plus or PLA Pro) has no shared standard. Each brand mixes its own additives into PLA, so the name means whatever that brand decided. eSUN, whose PLA+ is one of the best-known, says its version is stronger and tougher than standard PLA.
Owners commonly report that PLA+ bends a little before it breaks, where plain PLA snaps. Comparison guides report little or no gain in heat resistance, so PLA+ will not save a part that softens in a hot car. Because the recipes differ, results from one brand’s PLA+ do not carry over to another’s. Check the data sheet for the spool you buy.
Sources: eSUN.
Should I print with PLA or PETG?
Pick PETG for parts that get warm, go outside, or need to flex. Prusa rates PETG parts for indoor and most outdoor use below 80 °C, while PLA softens above 60 °C. Prusa also lists brittleness as one of PLA’s drawbacks, which matters for clips and snap-fit parts.
PLA is easier to print well. PETG runs hotter (Prusa’s profile uses 230 °C for the first layer, 240 °C after that, and an 85–90 °C bed) and is prone to stringing. It can also bond so hard to a smooth PEI sheet that it tears the surface when you remove the part. Prusa advises a textured or satin sheet, or a layer of glue stick if you use smooth PEI. More detail in PLA vs PETG.
Sources: Prusa Knowledge Base.
Is PLA or PETG food safe?
Assume a printed part is not food safe unless you take extra steps. Prusa says the PLA and PETG materials themselves may be considered food safe, but it does not recommend printed food containers or dishes. The grooves between layers hold residue and bacteria and are almost impossible to clean properly. Pigments and other additives in colored filament may not be food safe either, and Prusa does not consider the standard brass nozzle food safe because it wears.
If you still want to print something that touches food, Prusa suggests a stainless steel nozzle, a filament whose maker documents food-contact certification for that exact product, and a certified food-safe epoxy coating over the finished part. Prusa also warns that detergent can soak into layer lines and come out later. A cookie cutter, used briefly on cool dough, carries less risk than a cup or a container for warm food.
Sources: Prusa Knowledge Base, Prusa blog.
How do I stop stringing, especially with PETG?
Prusa traces stringing to a nozzle that is too hot, retraction settings that are off, or moisture in the filament. Start with the moisture test: dry the spool or try a fresh one. Wet PETG is the case owners report most often.
If dry filament still strings, lower the nozzle temperature by 5–10 °C and print a stringing test. Then increase retraction in small steps. Prusa caps retraction at 2 mm on its MK3 and MK2.5 printers; other printers have different limits, so start from your printer’s own profile. Some PETG settings checklists also suggest turning Z-hop off, because owners report it can make PETG stringing worse. To clean up a finished print, Prusa suggests a heat gun at about 200 °C, aimed at the strings for a second or two.
Sources: Prusa Knowledge Base, Prusa forum.
Why won’t my first layer stick to the bed?
The most common cause is grease on the sheet. Prusa recommends wiping it with 90% isopropyl alcohol and keeping fingers off the print area. If adhesion still fades over time, wash the sheet with warm water and a few drops of dish soap and dry it well. Prusa limits acetone to smooth PEI, about once a month, and says never to use it on textured or satin sheets.
If a clean sheet does not help, check the nozzle height with your printer’s first-layer calibration. Prusa warns against making up for poor adhesion by squishing the first layer lower. Its other fixes are raising the bed temperature by 5–10 °C, slowing the first three layers to about 75% speed, and adding a brim. Bambu Lab’s wiki points to one more cause on its printers: slicing for one plate type and printing on another, which sets the wrong bed temperature.
Sources: Prusa Knowledge Base, Bambu Lab Wiki, Bambu Lab forum.
Why do the corners of my PLA or PETG prints lift?
Plastic shrinks as it cools, and corners cool first, so they pull up off the bed. With PLA and PETG the fix is usually better adhesion and less draft. Prusa recommends a clean sheet and a brim, and says an open window or an air conditioner near the printer makes warping more likely. For one corner that keeps lifting, Prusa suggests adding a small cylinder under that spot in the slicer (often called a mouse ear).
Check the part cooling fan as well. Prusa notes that too much fan can lift the whole object, and that skipping cooling for the first few layers helps. Prusa does not recommend an enclosure for PLA or PETG; enclosures are for high-temperature materials like ABS and ASA (see ABS vs ASA).
Sources: Prusa Knowledge Base, Bambu Lab forum.