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.