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)

This fixed some layer issues at high speeds, but the spring is too strong. After carefully installing it I realized it was difficult to twist the lead screw by hand. After a few prints the grease on the lead screw had been scrapped off (along with some metal, the grease was blacked). I replaced the spring with a softer spring same size and now its printing perfect with no lead screw damage.

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.

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.

I installed these by following a video on how to install a backlash nut on an Ender. I compressed the nut, threaded the Z rod and it looked good. However, the gantry still drops at the lightest touch. Perhaps this would work better on a different printer.

I bought the oldham couplers and they didnt match with the original parts.

As described fast friendly service.

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

Easy to upgrade from standard.

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.

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