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)

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.

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!

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.

Unable to install due to different hole spacing on the backlash spring. Also realized that it would not do anything. Its basically a type of cvd to eliminate screw wobble from affecting the gantry but it is only threaded on one side so the bolt has to go all the way through the coupler into the lead screw nut making them one solid unit. It needs threads on both sides so that it can be mounted to the screw and the gantry with short machine screws.

Even if you dont use the spring or have dual axis the fact that these are threaded makes thebprocess of using them far far wasier than struggling with trying to attack a nut to thebkther side of the stock version! I used these with a kit here on Amazon for a dual upgraded z-axis on my Ender 3 Pro. The backlash component seems to function but it is a major pain getting the spacing jussssst right for it to workz. Check out the yourube video by TH3D on proper installation of these things ( note it is far easier to get it right by taking your axis completely out of the machine first versus installing in situ).

I installed a pair of plastic anti-backlash nuts on my Ender5+. That worked out so well that, even though I was having no trouble with my Ender3, I installed one on it too. The Ender3 has only one leadscrew, but I may install a second one soon. Backlash isnt really a problem on the Ender3 but I often use Z-hop, so it may prevent a future issue.

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.

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.

The threads are too tight. It is binding. I put my originals back on. I do not recommend.

One of the couplers was burred and too tight. No free movement at all. The holes on the coupler do not line up with the holes on the backlash not. Cant be used together at all.