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 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 these along with a Dual Z Axis Upgrade kit for my Ender 3 V2. They can be very hard to finally get threaded on the rods. Once I got them installed, calibrated and made sure everything was level I turned my printer on. I went to full height and them bottom. There was some pretty bad grinding. I did some more adjustments and started a 1h15m print. 40 minutes in, print got ruined. I did the same print 3 more times with the same issue in the same spot. I again adjusted and tried again. Again grinding and ruined print. I thought maybe it was the Dual Z Axis Upgrade kit. I decided the easiest route was to just put back on the stock ones. So I removed the anti backlash nuts and tried the same print. It went perfectly on the 1st time. With these anti backlash nuts installed the carriage is very hard to move and you dont want that while 3D printing. You want smooth motion everywhere. I suppose this may be good if you only have a single Z Axis lead screw. With Dual lead screws these are unnecessary. Ill be returning them.

I was concerned by other reviews that said that these didnt fit correctly. They must have fixed the issue because they bolted right on to my Ender 3 Pro, and also fit my dual Z kit from TH3D. They took care of my inconsistent Z layers... Ill be recommending these to others as something cheap to upgrade right away.

Pretty simple. I got 2 sets of these to mate with the anti back lash nuts they also sell and the holes didnt line up. No additional screws were included either. Not impressed.

Together with a dual z rod my ender 3 v2 prints flawlessly again. Good product

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.

If I could give this a 0 out of 5 I would; I ordered the backlash nuts a year ago for my ender 3v2 and they fit great so I thought of doing the same for my 3 S1 pro and pearing them with the oldham couplers... The backlash nuts are completely off this time, the m3 thread is about .5-1mm too high on both that came in the set making it impossible to use both the backlash and oldham. I have no idea how that one customer got both to fit together because most of the negative reviews mention the same thing. Something this inaccurate should not be sold on Amazon.

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.

The set comes with two units. On both of them, the threads were too tight. I should have known when I threaded them on (it took too much force to get the Z rods started). Because theyre so tight, it caused a ton of binding. Put my originals back on and I was back to buttery smooth. I really just wanted to try these for fun - turned into an annoying afternoon project. I do not recommend.

A