I have an Ender 3 v2. I upgraded my extruder with a dual gear aluminium kit. I configured the e-steps to be perfect, and have re-confirmed this.
But I have the following issue: especially when large continuous surfaces are filled in, the filament sometimes “slips”, and then for a short time little or nothing comes out of the nozzle, until the extruder has pushed it back up to the tip.
My assessment was that it was over-extruding, building up pressure at the nozzle tip, and then that pressure would be released by the filament slipping back. I don’t know if that is true, though.
I’m fairly confident that the new extruder gears are not at fault. They seem to be running smoothly and without any visible problems.
I reduced the flow rate, and that seemed to lessen the problem, but then you see the under-extrusion on the product, indicating that it wasn’t over-extruding to begin with?
So I’m not sure what to do here. I can’t think of anything else to check. Any help would be appreciated.