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)

Pulled the z axis rods off and installed these. No problems with fitment. Not sure if a gimmick or a useful product, time will tell but quality seems good and install was a breeze.

The bolt holes do not line up.

Fit my CR3 like a glove and solved two problems instantly. Improved size of calibration block by better than 0.1mm. Also reduced bumble foor to less than 0.1 mm. My original one was worn out after 2 years of use and this one fixed it up to be as good as new.

This does not fit the z axis rod for the creality 10s pro v2. I ordered 2 just in case there was a QC. problem. Neither fit. I am assuming the rod is a 2mm pitch, 8mm diameter. It could be that the part is correct and the rod is not. Be sure about what you are buying.

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.

One of these didnt even fit so seems like size isnt very accurate for these things

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

All it does is make your lead screw bind up. Z stepper was skipping steps and couldnt get the nozzle up off the bed. If your gantry is sinking to the bed when the steppers are off you might benefit from this but for general printers, this is a useless upgrade.

Just awful, bought these with the Oldham Couplers and they dont even fit those let alone my ender 3 pro. Crazy expense piece of garbage.

Fit perfectly on my older Ender 3. Fit right on my lead screw and you use the 2 original screws to bolt in into place. Watch TH3Ds video on fitting these if youre not familiar. Nice it comes with 2 so you can easily fit to dual z axis. Z hop and overall Z layer accuracy has never been better, but if you have major Z axis issues dont expect this to be the magic fix.