I've had a nightmare today. I have had errors all day long, the printer errors at the start of a print. Filament feed issues.
I thought maybe it was the AMS playing up, but nope, I switched from the AMS to the external spool, didn't help, I have stripped the print head and the nozzle down about 4 times today, looking for blockages, I've cleaned my nozzle and tried my other 0.2mm nozzle I bought. It errors when it tried to feed in filament for the print, but its working as it keeps purging poop pre-print fine every time, so the extruder gears are working.
I resorted to taking all the tubes off and just feeding in 30-40 cm of filament manually in the top of the head without the long tubes to feed it so i could see exactly if it was grabbing or not grabbing from the extruder. I set the nozzle temp to 250 manually and just told to extruder to feed manually and it took all the filament in and melted it all out nozzle, so it all works there is no clogg, not issue taking in filament - I can only assume it is a faulty sensor, I have logged a support ticket with bambu labs and hoping they can send me either a new complete print unit or at least some parts to swap out and test/fix it.
This is what it is doing:
but when i use the screen and set the temp to 250 manually and use the extruder to push the filament through it takes it and you can see in the next video below it took it all and dumped it melted on the plate, so it shows there is not a clogg, or a blockage.