2-Pack CR10 Z axis T8 Anti Backlash Spring Loaded Nut Elimination Gap Brass Nuts for Upgrade Ender 3 Ender 3s Ender 3 Pro V2 CR-10 Tornado 3D Printer 8mm Acme Threaded Rod (Nuts)

I tried, but they would not screw onto the 8/2 leadscrew on my Tenlog, and I didnt want to damage anything.

This fixed some layer issues at high speeds, but the spring is too strong. After carefully installing it I realized it was difficult to twist the lead screw by hand. After a few prints the grease on the lead screw had been scrapped off (along with some metal, the grease was blacked). I replaced the spring with a softer spring same size and now its printing perfect with no lead screw damage.

Great item would buy again A+++

Attempted to use these with some Oldham couplings on my Ender 3 Pro but had to use the original factory z screw nuts instead since the bolt hole pattern was too wide on these. Unfortunately cant return now as past the date. 1 star as description states it works with Ender 3 Pro.

The mounting holes on these anti-backlash buts are drilled slightly too far out from the stock mounting holes, so they dont fit on the brackets. Completely unusable without hogging the bracket holes out!

These backlash couplers do what I want them to do on my CR-10S and thats to keep the z axis from moving when I power down the machine. Before I installed these I used this machine for 3 years and frustratingly had to level my bed almost every time I used the machine! I could literally see the jackscrews move when I powered down thereby destroying my bed levelling. These backlash couplers put enough drag on the z axis screws to prevent them from moving (usually downward) when turning off the machine. My bed stays at the proper level the next time I use it, which is the way it should be! I put backlash in quotes because this device is not really doing anything in regards to backlash and thats not its primary purpose. Its purpose is to prevent movement of the jackscrews when you power down so as to preserve your bed level adjustment.

Pulled the z axis rods off and installed these. No problems with fitment. Not sure if a gimmick or a useful product, time will tell but quality seems good and install was a breeze.

To use this, the holes did not match existing part that you must use. The machining was not complete, no holes in the middle section. Waiting for replacement. Not sure if this will do anything or not to help.

like other reviews... the mount holes do NOT fit an Ender 3v2 or clone thereof... at least not without modification, i also had to take the Z rod and screw it on from the bottom side because it wouldnt start the threads from the bottom of the nut initially.... and finally... like other reviews, there is a grinding/binding noise at lower points (bed operating height) of the Z shaft. again, this is rectifiable... (read c.mercers review fixed my problem) with modifications... SO, even though this IS a cheap solution, and IS useable if youre capable... based on solely the quality of manufacture of this product... though its not a direct fit, plug and play part for the described machine its sold as... which equals 1 star, and not reccommended if youre looking for the quick fix this is supposed to be.

The nut does not line up with the mounting screws on a ender 3. This makes this completely useless. I wasted my time taking the lead screw out only to put it back just how it was.