Bondtech BMG Extruder - 1.75mm

Outstanding extruder. Purchased for my rostock max v3. It bolts directly onto a nema17 motor and it's geared so you get way more "torque", but not as much max speed. Speed isn't really important unless your running a bowden, adds a few seconds to swapping filaments (i've got a long bowden tube with the rostock). Driving force is unreal, but be careful, you can easily extrude too hard. I had a jam, and the driving force was enough to pop out the bowden tube, causing it to just airprint. It's not as easy to clean out if you don't have enough room, so make sure you can open the armature 90 degress to the body and be able to look inside.Another VERY important, note, the drive gear that fits on the Nema 17 has to be "backwards" where the grub screw is farthest away from the NEMA17 motor body, otherwise you'll strip the plastic teeth on the inside. The contact between the gear and the nema shaft is very very close to the body of the motor.Another great thing is that due to the gear reduction, you can run a much smaller NEMA17 motor, so if your looking to lighten up your hotend, this is also a good option if you pair it with a E3D hotend (direct attach). If you use bowden, then you'll need to purchase a grovemount bowden adapter as well.

Don't believe the hype! I received this extruder yesterday and I had high hopes for its performance. After installing it and configuring the steps/mm etc in Marlin, I proceeded to load the filament, I was excited to see how the "easy' loading went. When I tried to load the filament I noticed it was extremely hard to push the filament into the hole and I had to use the LCD to move the extruder to load the filament. Right away it was struggling to push filament through. I tried different filaments and had the same problem. That's when I took it apart to see what the problem was and I noticed that the hole was way too small (measuring 1.74mm). I needed a pliers to pull 1.75 filament through the hole. For the price of this extruder the tolerance should be dead perfect. To make a long story short, I drilled the hole out and it works perfectly now. I shouldn't have had to drill a brand new extruder though. I probably could have printed the clone of this extruder and had a better experience, and that would have cost pennies worth of filament. Not happy at all... even though it does work great now.

First off This is NOT a the full Extruder as shown in some of the pictures. The package just includes the gears and housing, no mounting bracket as shown and no motor. Turning the main gear by hand there is a spot in the rotation in which I can feel a little friction/rubbing, but nothing major that I wouldn't expect to wear in with time and it may just be a set screw being a little proud, still though for this high end extruder I would expect the smoothest operation possible. I checked the filament feed as I had read in an other review that it was not the correct diameter but had no issues with mine. Other than it not being complete as shown and the light friction on the turn the product appears very high quality, durable. clean, precise, and lightweight and was very nicely packaged in custom foam.I was greeted with a full list of helpful FAQ's in an email from the seller as well as a card with a link provided in the box. I enjoy the reassurance the dual gear drive provides and as I continue to tune and refine my printers eliminating fail-points and variables in moving parts is essential to piece of mind when printing big pieces or important ones. Overall I am very happy with this purchase but will have a better idea after a few months of printing.

Finally got tired of using cheap Chinese extruders that just don't work or last for a short time. It was a night and day difference when I first used this item. I don't have to worry about filament not feeding in and thru the extruder anymore. It doesn't crush the filament and is very precise. The steps/mm are given to you. I truly regret not spending the extra money and buying this sooner. No more headaches and it feeds any type of filament. Do yourself a favor and buy this. Your prints will look better immediately. I got a genuine E3D V6 to go with this and I'm so happy with the quality of my prints.

Highly highly recommended. Seriously, I fought extruders for way too long before buying this. It was like seeing the light. Technically why is it better? The dual hobbed teeth grab the filament from both sides and it's geared down 3:1 for maximum torque. It also looks like the hobbed gears (the pushing gears) also ride on needle bearings which would be incredible build quality if true. Very much worth the $80.