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does anything at all come out of the nozzle when you push filament into it?

when you had everything taken apart, was there any obvious blockage in the nozzle or stem?

when the filament is pulled into the printer it can become statically charged, attracting dust and such so it is possible for something other than filament to naturally find its way into the nozzle, which is 0.4mm and clogs easy.

when you baked the nozzle and stem, did you clean them out thoroughly?

i am sorry if my advice has not been helpful. ultimately, what did me the most justice was to take it apart and just figure out how it works and that made it easier to determine supposed to happen and what was not.

good luck!