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)

Nice upgrade for any 3d printer. Really helped with the backlash

Quality was ok but caused z-axis binding. Nice idea, but the experiment does not work.

Bolts dont line up on Ender 3 Pro. Essentially useless for my dual z set up. May try and swap for a new set, maybe it was a one off, otherwise the one star sticks for bad QA. Side note, on a test fit on the guide screw, it seems like this would lead to binding. Seems like the threads are off ever so slightly after a few twists you feels a good amount of resistance, then it lets off, then tight, then loose, etc etc. Again... could just be bad QA.

Fit perfectly on my older Ender 3. Fit right on my lead screw and you use the 2 original screws to bolt in into place. Watch TH3Ds video on fitting these if youre not familiar. Nice it comes with 2 so you can easily fit to dual z axis. Z hop and overall Z layer accuracy has never been better, but if you have major Z axis issues dont expect this to be the magic fix.

Upgraded 2 printers and they work great, a lot nicer than I was expecting for the cost honestly.

Read the reviews. The bolt holes were misaligned as others noted. Prefer to buy a product that fits without modification. Did not work on Ender 3 v2. I took a chance hoping the issue was resolved, but isnt the case for me.

works great for my ender 3 v2, wanted some way for anti backlash for my ender and this worked perfect.

Ender 3 s1 pro, the screw holes are about 1mm to close. Could only get 1 screw in.

Waste of money. The mounting holes are 1-2mm too far apart and do not line up with the stock lead screw bracket nor do they fit my aftermarket dual lead screw bracket. Look at my 2nd picture and you can visibly see the difference in hole spacing. Buy something else.

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.