We are proud to announce a terrific upgrade to the stock brass 'extruder' gear, found on many Creality printers. This is a single gear made from very hard, sharp, hardened tool steel. It has 38 very sharp, very hard teeth. This is the hardest gear available. It can be used in any CR-10. S4, and S5. It works with stock plastic extruder, and is a simple swap.
If you are experiencing wear on your brass gear, upgrade to this. Trust me, this gear may very well outlast your printer. The stock gear diameter is 10.9mm. This hardened steel gear is 11.15 mm. It is 2.3% larger, but will only alter your extrusion (flow by 1%). Since it is sharper, the effective diameter is actually closer to 10.9. Your stock profiles will work very well with this gear. This is an upgrade.