2-Pack 3D Printer T8 POM Anti Backlash Nuts Tr8x2 for Lead 2mm Pitch 2mm Acme Threaded Rod Eliminate The Gap Spring DIY CNC Accessories (2mm Lead of Thread)

These worked well. No binding and no excess friction. Would buy again.

The quality is great and comes with two. However the Anti-backlash Nut does not fit for Voxelab Polaris.

I purchased a set of these after Kersey Fabrications recommended these. I like the durability of brass, I would prefer bronze (due to them being self-lubricating), but brass seems to be the only other material you can get these in, and with dual leadscrews, they tend to squeak a bit, and you need to clean and re-lube the threads often. POM (Derlin) will not squeak, and is pretty durable. I installed these on an Ender 5 Plus, and they almost eliminated the problem I had where my Z gantry would go out of level. It hasn't entirely eliminated the issue, but I find I need to re-level the gantry far less often, and when I do, it's not off by as large an amount as the previous stock brass leadscrw nuts would end up after every print. I check after every four print jobs or so now, and they'll be out of alignment by 1 or 2mm. not bad. These do not squeak, at all, and I do notice some improvement in print surface finish, but I'm not sure how much is due to the silicone bed columns or these. I would recommend both this product, and the Fystec Silicone Bed leveling columns, using both in tandem will improve print quality, bed stability, as well as reduce the frequency you'll need to manually level the bed and Z gantry. These don't cost a lot, so they are a cheap investment. I've been using them for over a month with no issues, time will tell the longevity of these nuts. These may not last as long as the brass variety but they are cheap enough that they are easily replaced if they get any slop in the threads due to wear. If others are to be believed, these should have a pretty long service life. I'm overall very satisfied.

I got these and they don't offer enough pressure to hold the bed up. Especially as I have gone to a cast aluminum bed. I have these installed and they are bolted from the underside to make sure the I am not interfering with the spring.I got these springs for mine and they are holding fine. https://smile.amazon.com/gp/product/B09N6NJR3B

It was a straight forward install and it has gotten rid of the annoying screeching sound my Ender 5 Plus was making when hitting certain Z-heights.

I keep buying these for all leadscrew projects, because they keep being awesome

No squeaky noise anymore. Grease helped with stock nuts but still had unbearable noise. These guys fixed it. Ender 5 plus. Have to be a little handy to get it installed. Must relevel afterwards, worth it.

As everyone in the hobby knows, most leadscrew based motion systems on entry level 3d printers come with brass nuts installed on the leadscrews. In the past, I have replaced my standard brass nuts with anti-backlash nut assemblies that were still made of brass.When I got my Ender 5 plus more than a year ago, I was not satisfied with the way the nuts felt and how much play they had in them.When I went to replace them (a pretty typical and immediate upgrade for me) I found these POM nuts. Since installing them, my Z axis operation has been flawless. These nuts have alot tighter fit than any brass nuts i have used in the past and are dead silent.In addition to the great fit and feel, they are known (and in my experience confirmed) to improve print quality as well as prevent issues with dual z axis rods going out of sync.I enjoyed them so much, I installed some without hesitation on my CR10v3 before I even finished assembly.Do your self a favor, put these on your printer and thank me later.

I tried the standard brass running nut and the split brass nut on my Ender 5 Plus and they squeak although well lubricated. Found these plastic type split running nut and now silent. Although plastic they do work well. It's not easy to fit the screws and nuts but found that fitting the screws bottom up and the locking washer and nut on top worked OK.

Easy to fit, fixed a horrible high pitched squeal on z axis.On the Ender 5 plus they dont act as anti-backlash, gravity easily overcomes the spring on these but they are still useful to fix the squeal and that's what most want these for anyway.

Be aware, these are not metal. they are made out of plastic.Disappointing

Added to my aging Anet A6 and with some other upgrades it prints as well as my Ender 3 and TRonxy machines now. no more z banding!

Does the job well. Ender 5 plus has had about 100 hours use and still going strong with this mod!