I will only add this information - For standard Nylon PA12, the manufacturer writes a temperature limit of 87C, however, I print some large thin-walled parts and then dye them. Correctly I should dye at a temperature of 80-115C, unfortunately at such a high temperature the parts deform. That’s why I dye them at 60C, but at such a low temperature they don’t dye perfectly and I have to spray paint them additionally. Temperature resistance before deformation - internal stress will therefore be far lower than the indicated 87C.
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