Well, I was using T-motor MT2216 v2 1100kv and its so well built that little heat reaches the base of the motor so no softening of plastic there... The motor once over-heated just stopped powering up no more as I throttled up - it just kept spinning at constant slow speed.
I just tested it on bench again and works just fine on its "within spec" prop... Lesson learned here is with 3d printed planes do not say "Umm... Should be alright... or... we'll find out..." Thats typically my mentality with the foamies that are much forgiving. Worst part is after each of the 3 flights the motor was too hot to touch and I just kept on flying it... Lesson learned the hard way nonetheless...
All I can say you need about 1200g+ thrust on this plane to have fun flying this plane.
Just for sh**ts and giggles check the grub screw , I did have one where it sheared off the tip of the screw and it allowed the can to spin on the shaft. Inflight it would only idle and as soon as you powered up nothing but a little chattering noise. When I got the plane down it seemed to work fine again. Other then that I would almost suspect the esc, never had a motor power down when it got hot that is unless it left a trail of smoke and of course never to spin again.