PLA - Most PLA's melt at around 150 degrees celsius, however most PLA's remain stable and keep their shape at a lower temperature. Heat resistant PLA can resist up to 110 degrees celsius and remain perfectly intact.ABS - ABS has a HDT (heat deflection temperature) of 98 degrees celsius, meaning it can remain intact when exposed to up to 98 degree. Being exposed to greater than this temperature, it will begin to deform or lose its shape.