Upgrade CR-10 Extruder, 3D Printer 1.75mm Filament Extruder, Ender 3 Extruder with Two Extruder Gear Compatible for Ender 3 Pro,Ender 3 v2/CR-10S, Extruder Motor Shaft>20mm,

This product worked as expected from the specifications. No issues at the moment.

This is a great upgrade for any 3D printer

I use the printer once or twice a month so it really doesn't get a lot of use. After 6 or 7 months I heard a clicking sound and noticed that the filament was no longer feeding. The issue is that the pressure arm with the second pulley, that the pulley was loose. I attempted to tighten it but found that the aluminum was stripped and could no longer be tightened.I examined the pulley's screw and the thread is fine, it is definitely the threaded aluminum pressure arm. Since this is a main part the feeder no longer works.Update: I replaced the spring with the original spring and the feeder now feeds again (was clicking with the new tight spring). Will have to keep an eye on the stripped screw thread to see if the feeder remains usable or will have to be replaced.

I have been through THREE of these. All three were sent back. Dual gears seem to be worse than single gear extrudors. It may lay 2 to 3 layers down then it stops gripping the filament. This dual gear extrudor has cost me at least 2 full rolls of filament from starting and stopping over and over again. Back to single gear!!

Works pretty well. Rigid filaments will print much faster with the dual gears, but like most extruders, you'll need to slow it down a lot for flexible filaments, but no more than any other extruder. This just barely fits the stock extruder motor on an ender 3, if you can get the stock gear off, that is. I bought two for dual extrusion and I plan to buy three more eventually.

This doesn't work at all on recently released Ender 3 Pro's, the motor rod's on the extruder motor for Ender 3 Pro's are too short, so you can't adjust them high enough to set the gear for where the filament comes out. Also this doesn't work with the Ender 3 filament sensor either, the filament comes out way too high up.Edit: Increasing this to 3 stars as buying and upgrading my Ender 3 Pro's motor to one with a longer shaft did make this part work with my Ender 3 Pro, however not giving it full stars as this thing shreds filament on the entry port, leaves dust everywhere. Prints fine though.

The first one I received was missing parts and assembly instructions, the second one was also missing some mount screws, luckily the local ACE Hardware had some screws in stock so I could make the extruder work. There were still no instructions with the second one. I had to increase the feed rotation by 40% to account for the smaller diameter of the drive sheave. The new extruder also is 10 mm taller so the feed guides that I had printed to fit the old extruder have to be remade to fit the new one. in conclusion, due to the lack of documentation, the missing parts, and the dimensional differences, I would not recommend this item

There are 0 reasons a dual gear mk8 extruder should need a change in e-steps. But I got nothing but underextrusion with this. Only reason I even bought it is they're the only ones that include the proper screw for the gear on the arm.

Este mecanismos para extruir es mejor que el que viene con la impresora ender 3, mejor agarre del filamento y mejora el resorte y más resistente al ser de fierro