[quote=“raby”]It happens mostly when the temperature is too high.
As the contact between the thermal sensor and the heater is far from optimal and the fan is blowing on it, the displayed temperature is well lower than the actual one.
So you should print PLA at 190° and ABS at 220° max (or even 210 depending on the color and brand).[/quote]
Thank you very much for your reply. All the prints were done with PLA at 190°C. Still the tube got blocked… Is it possible to go lower than 190°C?