BIGTREETECH Dual Gear Extruder 3D Printer Extruders Double Gear mk8 extruder Dual Driver Feed for Creality Ender 3/5 Ender 3 V2 CR10S CR-10 Pro CR-10S 3D Printer 1.75mm Filament

Works great as a replacement for the default extruder on my modified Ender3v2, the double tube connection is a favorable feature especially if you want to run a tube from it to a filament dry box.If like me you replacing something on a old Ender3 variant and you had the old default 93 E-steps, bump up the E-steps to 138 E-steps and adjust flow rate in the slicer from there for your filament fine tuning.

This extruder is well made in general, and it works very well, assuming you take some things into consideration...1. If you are using an Ender 3 or Ender 3 Pro which it states compatibility with - that's not 100% correct. It will not fit in place with the left side pneumatic connector attached. It interferes with the Z-axis screw (in fact, you can't physically attach it after the fact). This leaves the hole that the filament enters quite large and can result in scraping of filament - not good. The solution is to have some other feature attached that helps guide the filament straight in - usually something you need to print yourself.The second problem, and this is universal to everything that is made by BigTreeTech is that there are no instructions. You get a bag of stuff and a hearty "good luck", except not that last one. Luckily, I was able to find a video online by Creality that explained how to install another brand's dual gear extruder that is exactly the same.If you keep these things in mind and do your homework, this is an excellent replacement for the standard extruder, or for one that is showing problems.

Instalation was super easy, very durable materials, fits perfectly on the printer, and the value you get for the price is unmatched. If you're having extruding problems with your ender printer, I can't recommend this dual gear extruder enough. I have had zero issues with this product and I've used it for about a year now.

i used it on my ender 3, i have a direct drive adapter so i didn't mount it in the stock location with the Bowden tube. but once installed it works good. better design than the stock drive unit. all metal is a nice feature. Don't forget to tune your E steps/mm mine was under-extruding until i got it dialed in

I bought this because I was having problems with the stock extruder on my Ender 3 v2. After some adjustments, it worked, and just a couple of weeks later now it slips like crazy, with no further adjustment available. I took it off and inspected it, and the cheap gears they used are already visibly worn — teeth are actually bent out of shape just from pushing PLA for ~20 hours.Ignore the BTT name, it’s meaningless outside of their own first-party designs. This is a cheap clone, and it’s not worth the price tag.

UPDATE -After finding out it wouldn't fit the stock motor, I ordered a newmotor with a long shaft and started the assembly.The design is VERY poor - fitting for the feed tubewill not work due to rubbing the Z axis drive.I had issues with the drive board from them andnow with the dual drive unit here.If it were not for Amazon taking charge andfixing the issues I would have been very upset -A+ for Amazon and D- for BTT.FALSE Advertisement, AGAIN - this is getting real irritating...

The box includes all the parts, however the lack of instructions left a little to be desired.Don't forget to adjust the ESteps/mm. For me, I used an online recommendation of 138.8 and its working great.

So it has the same issue as everyone talks about, the second extruder gear will grind into the arm and eventually wear itself out. My solution was to wait until it wore a bit of a groove, then use that space to install a small washer. In addition, the fitment isn't close enough to reliably print flexible filaments like TPU. However, I found a solution. Drill into the aluminum filament hole with an 11/64th drill bit, and insert some PTFE tubing and cut it to a point, and align it to the extruder gears, just to close the gap and avoid the TPU getting clogged. It's kind of a silly solution to a silly problem, but there you go.Lastly, be careful not to overtighten the grub screw on the extruder gear. It's not the best metal, so it strips out easily.Overall, despite the problems, it works well after the tweaks and I'm happy with it.