PLA or PETG? How to pick for Singapore heat

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PLA or PETG: which should I choose?

Start with heat. PLA softens above about 55 °C. PETG is usually tougher and more heat resistant than PLA. If the part will sit somewhere warm or take knocks, PETG usually copes better. If it will stay cool and indoors and detail matters most, PLA is the easy choice.

Then pick by use. PETG suits clips and parts that get bent or warmed. PLA suits models, display pieces and parts with fine detail that stay cool.

Will PLA melt in a hot car or in the sun?

PLA is unlikely to melt, but it can soften and lose its shape. PLA softens above about 55 °C. PETG usually softens at about 65 to 75 °C, depending on the brand, so it copes with somewhat more heat, but it is not heat proof.

Sun can make a dark part much hotter than the air around it. A car parked in the sun can get hot enough to soften either plastic. In an Arizona test on summer days of 38 °C or more, the dashboards of cars parked in the sun for an hour averaged about 70 °C.

Singapore's daytime highs are usually in the low 30s °C, so a part indoors or in the shade is usually well below either limit. Keep both away from closed cars in the sun, hot lamps and heaters.

Which is stronger, PLA or PETG?

It depends on the kind of strength. PLA is usually stiffer, so it bends less under a load. PETG is tougher, so it usually takes knocks and drops better. Choose PETG for a part that gets hit or bent, and PLA for a part that must stay stiff and cool.

Strength also comes from how the part is printed. The page with your print price has a strength setting that runs from Light to Solid. More plastic inside the part and more walls usually make either plastic stronger. Prints are not certified for safety-critical, medical or food-contact use.

Is PETG better than PLA outdoors?

PETG usually lasts better outdoors than PLA. PLA is usually not the first choice for long outdoor use, and strong sun softens it first. PETG is not a sure fix, because how well it handles sunlight over time varies.

Do not count on either plastic to last a long time in strong sun. PETG usually copes well with damp, but a printed part is not automatically waterproof, because water can get through the layer lines.

For a part that must live outdoors, test a piece first. Leave it where the part will sit, and check it for bending and fading before you rely on it.

Which one shows finer detail?

PLA is easy to print, rigid and shows great detail. For sharp edges, small text or tiny features, choose PLA. A thinner layer height looks smoother in either plastic, but it takes longer, so the print price can rise.

Does the choice change my print price?

It can. PETG usually prints more slowly than PLA, so the same part can cost more in PETG. Pick one plastic on the page with your print price, note the print price, then pick the other. Choose by heat first and by print price second.

What should I do next?

Ask three questions: how hot will the part get, how will it be used, and does fine detail matter? Heat decides first, then use, then detail. Then try both plastics on your own file and compare the print price.

The print price you lock never goes up. You see the handling fee and delivery before you pay, and nothing is added after you pay. Chosen your plastic? See your print price in seconds at makerlane.sg.