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)

Holes spaced further apart than normal by about 0.5mm so won’t mount to frame.

Able to upgrade my two Ender 3s (Pro & V2) with one purchase. Easy to install, a little fiddly with the spring and matching the fittings but no big deal.

THIS IS A BIG ISSUE, DO NOT BUY UNLESS THIS IS FIXED. THIS WOULD NOT FIX ON MY ENDER 3 as the MOUNTING HOLE IS too far apart.

The set comes with two units. On both of them, the threads were too tight. I should have known when I threaded them on (it took too much force to get the Z rods started). Because theyre so tight, it caused a ton of binding. Put my originals back on and I was back to buttery smooth. I really just wanted to try these for fun - turned into an annoying afternoon project. I do not recommend.

While these nuts are great for eliminating backlash on your 3D printer and preventing carriage creep, the pair I got did not fit their other halves. Nothing too bad that couldnt be remedied with a few file strokes though. None the less, still very happy with them and will be buying them for any future printers I buy.

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.

One of the couplers was burred and too tight. No free movement at all. The holes on the coupler do not line up with the holes on the backlash not. Cant be used together at all.

Used this kit to upgrade the stability of the Z-axis on my Creality CR10S-Pro V2. Gantry kept sagging to one side when the power turned off. Installed these puppies and *poof* - no more tilt! I can press gently down on the frame and it stays put. The nice thing about these is that you dont have to cut the brass fittings to fit onto the frame- just remove the screws, compress each unit and install. Better have two sets of tweezers to hold the small parts when reinstalling, though. Also, if it doesnt screw onto the axis the first few times, no worries- its a precision part. Here are the steps I followed. 1. Gently unscrew the threaded rod from the frame. Remove the current brass fittings, set the screws aside in a safe place. A towel or small bowl is fine. 2. Rotate the brass collar slowly and as straight as possible until it screws on enough to stay put. Do not screw it on all the way. 3. Compress the rest of the fitting onto the part before continuing the rotation. The teeth should be locked into each other. 4. Secure the brass fitting to the frame of your machine using your screws, but flush the nuts with the underside of your frame before you finish securing your screws. 5. Make sure the top of your rod is flush with the top of the frame before you secure the collars to the motor. This will prevent the threads on your axis from being misaligned. Hope this helps!