Every time he starts printing the filament comes out irregularly and I could not understand why.
I manually calibrated the printer Nothing
I left the filament free to flow into the tube. Nothing
I tried to change the air flow Nothing
Suddenly I discovered that increasing the temperature, the raft seems to be back than before, but this only if the filament is not pulled independently, but helped by the fact that I push it constantly towards the tube.
(I'm using formfutura Pla and the temperature is set to 212 degrees )
When, however, the raft appears to have been created, printing fails, perhaps due to too much temperature, or perhaps because the stepper motor can not pull the filament correctly. Every time I try to print it then, arrived at a certain height, the printing stops.
the thing makes me crazy also because, using the abs of the up, everything comes back as before.
I need to understand this paranormal phenomenon. :/
1: Have you cleaned your extruder gear? It sounds like the teeth aren't gripping the filament and pulling it through. Basically, take your heater block off the unit, and remove the Fan cables. Pull on the Fan duct and it should slide off (sometimes a little force if it's been a while, but don't break anything, if it won't come off you might have missed something holding it on.)
Once the fan duct is off, there is a white plastic rectangle screwed to the motor - take that off to reveal your extruder gear. If it's caked in plastic (which I'm thinking it might be) then clean it off. I hit mine with a nylon brush and then a pair of tweezers to get between the teeth. Put it all back together and see if it's extruding normally.
2: The other option is a clogged nozzle. Heat it up and then remove it. If you hold it up to the light, you should see a perfect pin prick dot of light for the opening. If not...you can clean it with a 0.4mm bit.
now the printer starts to "clicking" from the first moment, then few times later it starts to print. it seems that the gear isn't strong enough to pull out the filament
Maybe lower the bed in settings by 0.1 intervals and see if the clicking stops.