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Why not leave PLA in your car in the sun


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Posted (edited) · Why not leave PLA in your car in the sun

This is why you should not leave a PLA-print in your car in the sun.


This was a PLA-mould for casting silicones. I had way overdone chemical smoothing, so in combination with the low-infill, the solvent seeped deeply into the plastic, and slightly warped it. So the mould wouldn't fit properly and wouldn't close anymore. I thought I would straighten-out the warping by clamping the mould, and then putting it in a computer-controlled incubator (=precise low-temp oven) at exactly 60.0°C for a few hours. Just above glass transition temp. Not the best choice, obviously.  🙂


In a car in the sun, it can easily get hotter than 60°C, even up to 80°C. So, never leave PLA prints in the car, or elsewhere in the sun. Don't waste time trying to anneal PLA, because that by itself also deforms and warps the part. For car-parts, use PET or some other higher-temp material instead.




Edited by geert_2
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