Befenybay 6PCS Diameter 8mm Black TR8x2 Lead Screw Nut for CNC and 3D Printer Parts (Size: Tr8x2)

Sadly these are 22mm not 25mm as required for prusa. Size should be specified in description!

I decided not to wait for the brass ones to wear out. sure they are self-lubricating, as they wear out, but their wear provokes the increasing possibility of backlash on a gravity-engaged moving part. These POM pieces are the worlds slipperiest plastic with the best wear rate. They are a tight fit, compared to even new brass lead screw nuts, but that tightness is not binding. reassuring is the word I would use. From what I have read, the wear properties are much superior to the brass. I retain the brass as they have not been used to the point of being worn out. The Z gantry of my 3D printer feels more substantially connected and any crew-induced motion artifacts no longer exist. Just smooth layer lines, buttery smooth and consistent. This will be a first order upgrade for any and all of my new FDM printers from now on.

Good item

Quieter than brass and zero lash. Yeah they wear eventually but there are six of them in the package.

Worked!

TR8X4 works for Anycubic Mega-X. Hole pattern is good but not threaded. Need to use longer bolts and nuts.

Very solid and tight threads. Barely any play along the t8 rod. No lubrication needed and very quiet in operation. I have known delrin to be a very strong polymer - not easy at all to wear and cut but using this material makes the most sense to make contact with metal.

My ender 5 plus was driving me insane till I used these. Its so much better now, no more squeaks!

Super quiet, barely any play compared to brass nuts. These fit my 3d printer perfectly. Z movement is not loud at all. I hear the motors themselves way more clearly over the lewdscrew nut.

I used these to replace the original brass anti backlash nuts on my Sainsmart Genmitsu 3018 pro cnc machine. The ones that came with the machine were a nice fit on the leadscrew, but the housing they went into was a sloppy fit. There was about 1mm or so of play so when the machine was running, the anti backlash nuts on all three axis (X,Y and Z) would all rattle around and make a god awful noise. These are not an instant upgrade though as they are round and the ones I replaced were more rectangular so what I did was used a file (a rasp works too) to gradually shave down two opposite sides evenly and kept test fitting them into the recess until they were a nice snug fit with no movement. It takes awhile but its worth it, my machine is so much quieter now, no more clattering sounds. I also stuck another one up underneath where the Z axis lead screw ends because on my machine there was literally nothing there but an empty hole. The end of the lead screw basically just dangles there and there is nothing to contain it and keep it from waggling around. I did have to dissemble the Z axis to do this and then I had to slightly enlarge the hole below where the Z axis leadscrew ends. Then you just need to drill out the threads on one of these lead screw nuts and push it up through the bottom of the Z axis assembly. Choose a drill bill that is just big enough to remove the threads, thats all. Now the Z axis leadscrew can not flex anywhere because it is contained at the bottom (with the threads drilled out it can spin freely inside the nut without catching). Overall, for less than $10, these made for a nice cheap upgrade for my machine and made it much quieter and Ive still got two spares left! Good deal.