This is the awesome Pikistruder that working amazing with the cr10 printers , highly recommended upgrade ;)
Its work on E3D V6 hotend with BMG duel drive gears for high reliability and maximum grip on the filament.
Its can work with the original stepper motor or lighter pancake stepper motor (recommended).
**EDIT 22.5.2019: I add Bltouch option - file name is stepper motor separator . (untested)