extruder clogged only after 15-20 minutes?????

Hello everybody,

I have a Prusa i3 MK2S.
Something strange: print ok at the beginning with PLA at 210 or 220°C. After 15-20 minutes, I hear tic tic because filament don't move: extruder is clogged. I unload and reload filament and ok for 10 minutes only again.

Difficult to understand the problem when ok at the beginning. I've tried at 230 or 240°C, but same problem.

I'm despited!

Thanks for your help.

Thierry

Far too hot. Try 190C for PLA. Search the Printing forum for "heat creep".