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)

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.

The long dovetail section has a little looser of a fit, and there is a tiny amount of backlash in these. Cant tell how much. The more important issue is the nut hole on the Ender 3 mounting plate is not aligned on the x -axis (with my linear rail setup). Im getting the mounting holes slots and will open thhe nut hole for more clearance. Will update review if I need to use

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

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.

Some received a product that doesnt fit on their machine. I did not, and installation with a POM nut was quick and removed 100% of binding. I checked for loose tolerances and there is a very slight wiggle that can be felt and heard, but not seen, which is good enough for the Z-axis of a 3d printer. I suggest hanging your gantry from this coupling and having the nut above them both so gravity pre-loads it, reducing backlash by ensuring the nut meshes on lower side of the threading at all times. As for reduction in print artifacts, I can say it does help but isnt a panacea. Adjust eccentric nuts. Replace POM wheels. Look into a ways to support the other end of the gantry.

The added length of the nut on the lead screw makes alignment much more important. If the two leadscrews are out of alignment this anti-backlash upgrade will cause the 3D printer to bind up. It can be pretty difficult and time consuming to perfectly align the two screws in order to use these nuts. I went back to stock and had no issues at all. In the end though, these arent really necessary for a Z axis. The weight of the hotend itself will eliminate backlash (the nut will not float up the screw and cause lost motion like these setups can in X and Y on CNC machines). Since gravity is holding the nut against the leadscrew backlash isnt really an issue for the Z axis so long as the wheels arent overtightened. They also caused an odd creaking noise when installed on my machine. The two tapped holes also did not quite align with the holes in the mounting bracket so I could only screw one side in without crossthreading the other.

Quality was ok but caused z-axis binding. Nice idea, but the experiment does not work.

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.

Easy to upgrade from standard.

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