k1 Max Extruder Upgrade xirbbo 2Pcs Motor Extruder Gears k1 Max All Metal Filament Drive Extruder Gears for Creality K1 / K1 Max / K1C Nickel Plated Hardened Steel Plating 3D Printer Accessories Parts

Really fast on delivery and it works great in my 3d printer

Used these for several hundreds of hours of printing so far, and had no issues with extrusion whatsoever. I did not conduct a thorough evaluation with different filaments, but unlike the stock ones, these ones have not had remnants of filament stuck between their teeth - which is probably a good sign.

This upgrade kit made a big difference in lessening jams.

Higher quality than the plasitc gears that come standard in many 3D printers

Does not fit in the k1se CFS upgrade kit version of extruder! The multicolor extruder gears are 1.3mm shorter with 1 gear housed inside the lever arm. Havent tested yet but swapping one gear does 'fit'. Installed on original extruder perfectly for emergency use later.

Recommend upgrade

First off let me start this review by saying I may have gotten a bad set, it happens, but being as that may I will be reviewing the set I got.I installed these on my K1 Max as I was starting to get more into TPU printing and had read that switching to all metal gears had helped another user's prints. However I also bought a second extruder just in case as I had also seen the review of it destroying someone's extruder. Well first thing I noticed was it was a lot easier to guide the filament down into the nozzle when loading.......that honestly should have been my first clue of the issue to come.I started a flow test to see how it preformed at a temp and speed I know the unmodified extruder could print at and had to stop before the first layer was done due to massive extrusion issues with it underextruding like crazy on chips that the original one printed just fine. Increased the temp by 10 and then by 20 and same thing.Switched over to the new extruder, which was harder to get the filament loaded, and ran the test from before with the known good temp. Printing just fine, my running theory is that the gears have a bigger gap making it so it's not applying the correct tension. Again could have been the set I got but definitely think before buying.

Original gears were plastic and broke within weeks. I replaced them with these and haven’t had an issue since!