Getting excellent quality from the Ender 6 running Klipper and the BIQU H2 Extruder. More info here:

BIQU H2
https://3dprintbeginner.com/biqu-h2-extruder-review/
Klipper on Ender 6
https://3dprintbeginner.com/how-to-install-klipper-on-creality-ender-6/

Mount available here: https://www.thingiverse.com/thing:4822425