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)

This was easy to install. And it removed the slack from my gantry. I do wish they supplied at least one extra washer and screw set. As small as the washers are I was easily able to lose one. But that was my mistake.

Fits the stock z-axis bracket fine, but had a slight fitment issue with my second z-axis bracket. Filed the holes a bit bigger on the second bracket and it fit fine. Nuts might seem like they dont fit the lead screws at first. May take some persuasion to get them to seat into the threads on the lead screws.

Fit my CR3 like a glove and solved two problems instantly. Improved size of calibration block by better than 0.1mm. Also reduced bumble foor to less than 0.1 mm. My original one was worn out after 2 years of use and this one fixed it up to be as good as new.

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

I ordered two of these for an Ender 3 V2 rebuild. Very much two different sizes. I got the smaller one to work by enlarging screw holes and it functions but its clearly the wrong size. The larger one was perfect. If youre ordering these, you probably assume you have some z wobble due to the lead screws. These will help tremendously and watching how much they deviate gives you an idea of how bad the issue was.

I bought both the nuts and an oldham coupling and spent 2 hours trying to get the screws in to the nut from the oldham coupling. The first issue is that there was NO instructions and no included screws, but even after I looked at a different brands listing to see how they worked, I realized the reason I had been struggling was because the screw holes on the nuts were farther apart then the oldham coupling openings. Frustrated and impatient, I clamped down on the two parts with pliers and forced the screws in and got it together. Mostly because I didnt want to go to the hassle of sending it back and most of these seem to have people listing the same issue. However, these are some of the more expensive ones and I dont see any reason to spend the money. Buy cheaper!

I loved this product. It really helped with my elephants foot problems! That and turning down my heat settings but you get the idea

It didnt match the threads to my z-axis lead screw, had to return.

Good product

Spent 10 minutes trying to install and could not figure out why I couldnt get both screws in. Then I realized the holes are too far apart by about half a mil. Could not install. Returning.