When printing with my A1 the extruder head clicks when it’s extruding, but only during the first few layers, then it prints normally, assuming the print sticks and I don’t care about first layer quality.
I’ve replaced the nozzle even after thoroughly unclogging it, changed the extruder gear, checked the alignment of the nozzle and extruder and filament hub, and probably other things that I’ve forgotten…it doesn’t do it when I manually feed filament.
It does it regardless of filament used, but in this case PETG and pla.
Here’s a link to videos doing the clicking and then another of it not clicking