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)

Quality built product. Only issue is that the hole spacing is off by about 1mm compared to the OEM part. I had to slightly drill out the mounting holes of plastic spacer to be able to get the screws in. Other than that it is working great.

The description called this a set so I ordered one thinking that it has 2 couplers, but no its only a single one. 1 star because of this

Initially fits more tightly than the nut its replacing (cause it hasnt been worn-in with use). Be sure to compress the spring fully when inserting. The little dog ears make a slight tick noise that wasnt there before, but only on z-travel. Lubed with some 3-in-1 but will wipe clean and redo when the superlube gets here. Ender 3 pro, used both while performing a dual-Z pully upgrade.

I own a Creality Ender 3 v2 and put these on as an upgrade. It makes a big difference. Just know that the top piece with the notch in it, the notch faces down to the bottom, there is a great video on All3dp.com, but they tell you to put this piece on opposite of what i said because they are using a different mfg. But the rest is the same.

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.

Dont buy if you need accuracy. I have two of these because I have two Z screws on my 3D printer. This component is meant to enhance the precision of the printer, but the machining of the component is clearly inconsistent. It allows for about .4mm of play in the Z axis when the entire point is for it to maintain a consistent Z value and allow for tolerance on the X and Y axis. The mounting screws-holes are also inconsistently placed, deviating by about .7mm, and making mounting doubius. The way this is mounted does not allow for correction by an anti backlash component. Dont buy this if your intention is increased accuracy.

While these nuts are great for eliminating backlash on your 3D printer and preventing carriage creep, the pair I got did not fit their other halves. Nothing too bad that couldnt be remedied with a few file strokes though. None the less, still very happy with them and will be buying them for any future printers I buy.

I got these to install on my Ender 3 S1 Pro and one of the two that came were too big. It also seemed to be much poorer quality than the correct size, so perhaps a counterfeit? Notice the burr or machining defect stick out in the picture? The smaller, correct sized coupler didnt have that defect. Overall not a great first impression, but Im going to return one and see what I get back from the seller

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

This is an awesome solution to keep any inaccuracies in you z lead screw from ruining your prints. Polisi3D always has some of the finest machined parts, better most times than the BIG brands. Fit perfectly on my Ender3 and as I said the machining is so good it glides. A work of art for a oldham coupling. Will be buying more for sure.