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What happened to my I3 Mega is that the extrusion motor overheated. The pressure wheel and the filament got too hot, the filament got soft, deformed under the pressure wheel, got damaged and didn't go in any more.
Maybe it's a symptom of something else (a beginning obstruction in the heater or so), but in my case I noted that the extruder motor wasn't moving smoothly anymore (remove the motor from it's frame and check how it's moving). I disassembled the motor and replaced the bearings.