I don't have any PLA parts in the printer.
The pulley redesign is in PET
Everything on the printhead is in ABS
PLA is becoming weak at temperatures >50°
PET starts around 70, ABS at 100°C
If you really want to be at the good side, print in polycarbonate
With the E3D's you could do that. Termistor is the weak part. max temp=300°C.
I did a test with PLA for the partcooler to check the design and with alu-tape at the sides facing the hot end.
After 3 hours printing still no weakness ...
Was with a bed at 60°C, but hotend at 210°C all the time.