[QUOTE=curious aardvark;144548]As I've never had ANY pla warp or melt in sun - so I'd have to say no. /QUOTE]

Says the man from the center of the UK.. :-)
Outside summer temp in the shade here in the glorious dirty violent city of Philadelphia PA USA gets to 100+ F, add the sun and you got soft plastic..
Esun wood warped a bit on the bed when using just polymide tape printed at 100% infill. I had to add glue stick to keep it flat.. but Esun is not the best from what I hear.