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)

The mounting holes on these anti-backlash buts are drilled slightly too far out from the stock mounting holes, so they dont fit on the brackets. Completely unusable without hogging the bracket holes out!

Great item would buy again A+++

Okay, think about a ruler hanging over the edge of a table 10 inches, its easy to press down and deflect the ruler with your finger because the rulers resistance at 10 inches is very low. Now if you draw the ruler in so that most of it is touching the table and only 1 inch is hanging over the table, it is very hard to deflect. **** Well, this is the issue with binding, not only the two screws that secure the bearing/backlash nut need to be loosened, but also the two screws for the adapter that hold the lead screw to the motor, and the screws that hold the motor to the 90 degree mounting plate. Loosen all six of these screws. Make sure the bearing/backlash nut is greased well and run your Z-stage all the way down to the limit switch and make sure it is resting against the limit switch when you tighten it down. **** Why? Because the lead screw flexes the least in this position, so we want the placement of all elements to favor running true at the limit switch. Like the ruler mentioned in the example above, the system could care less at the far end, the lead screw will flex and not put up a fight that far out, but closer to the limit switch when it gets short is where everything needs to be truest.

Bolts dont line up on Ender 3 Pro. Essentially useless for my dual z set up. May try and swap for a new set, maybe it was a one off, otherwise the one star sticks for bad QA. Side note, on a test fit on the guide screw, it seems like this would lead to binding. Seems like the threads are off ever so slightly after a few twists you feels a good amount of resistance, then it lets off, then tight, then loose, etc etc. Again... could just be bad QA.

I bought these for my Ender 3 Pro nut, installed it on the original left side...and the inner diameter is too small for the Pros 8mm lead screw. The ad and packaging both say this set is designed for Ender 3 Pros 8mm lead screw. This will also not fit the Ender 3 V2, which I also checked out. Poor QC? Improperly labeled package? Returned and now looking for another vendor to do it right.

Easy to upgrade from standard.

Pretty simple. I got 2 sets of these to mate with the anti back lash nuts they also sell and the holes didnt line up. No additional screws were included either. Not impressed.

Most 3d printer noys just make junk toys; and will not have the skill to install these. Which is why there are a lot of bad reviews. Toy printers arent usually machinists. I found these easy to install and they stiffened the z axis a lot. The accuracy is great.

Easy to install on the ender 3 v2. Not sure if there is a measurable difference in the z stability but it’s a good inexpensive part.

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.