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)

Recommend to help solve backlash issues on your 3D printer

Im one of the lucky ones that had a droopy z-axis. The backlash spring immediately took care of that problem.

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.

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.

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

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

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

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

THIS IS A BIG ISSUE, DO NOT BUY UNLESS THIS IS FIXED. THIS WOULD NOT FIX ON MY ENDER 3 as the MOUNTING HOLE IS too far apart.

I bought two for my dual z setup 3D printer. The first I installed went on fine, and absolutely removed the z wobble I was experiencing on that axis. The second somehow wouldnt line up... I worked on it for a while, but none of the holes were working as the first, and I suddenly noticed the anti backlash nut end I was trying to install was overlapping much much more than the first, sticking out over both ends.. I took my calipers to it, and the first measured 26.5mm in length and the other was 24mm with closer spacing on all of the bolt holes. None of them lined up. The other reviews saying they dont fit were right, as were the ones happy, but I guess its a luck situation. I imagine if Id started with the smaller of the two I wouldnt have had a successful install and assumed they were just all wrong. Both bags were labelled identically. Same serial numbers and the same item name. Extremely disappointing. EDIT: I did hear back from the company on this. They dont seem to understand why they have two different sizes, and offered me a completely different one as a replacement. The one they sell that is a regular z gantry nut and Oldham combo, but that would leave me without an anti backlash solution. I came to some conclusions after measuring the parts, and also my OEM gantry z nut. They have two different sizes of Oldham couplers. They have ONE size of anti-backlash nut, that fits only that larger size of Oldham. The reason why both sizes of Oldham fit the OEM gantry (without anti backlash nut) is the slot allows wiggle room on the oem nuts, and as such both sizes of Oldham fits. As do the anti backlash nuts on their own. Theres slop enough to allow fitment of both. Both sizes of Oldhams do not accept the anti backlash nuts that they sell, as many reviewers have mentioned. They are too large for the smaller Oldham coupler they sell. Its a c**p shoot because you either need two of their smaller Oldhams to pair with your original nuts (the larger ones will not fit, as the holes are too wide), or if you want to pair them with their anti backlash nuts, you need the two larger Oldham couplers from them. They are unable to specify what you will be getting. If you get two smaller ones, you need to source different anti backlash nuts that fit, or use your OEM fitting. *shrug* A straight mess. This is what happens when people buy from the same manufacturers and repackage them. They dont know what theyre selling, and if a huge amount of them leak into the market, were dealing with them not fitting in bizarre combinations for potentially years.