48 PCS 3D Printer POM Pulley Wheel Set with Pulley Bearing Included 16 PCS Pulley Wheels 16 PCS Eccentric Spacer 16 PCS Round Column for Creality Anycubic Anet Series 3D Printer Ender 3

Works as intended, super smooth action. Just take your time and install then right.

I created a laser printer and used it for one of two degrees of freedom.

Only been on for a few days now, but no problems to speak of. I am tending to think that those complaining of binding due to these wheels just dont have their gantry and posts fully adjusted correctly. 3D Printing requires EXACT and PRECISE assembly, leveling, etc for good prints. 'Close Enough' and 'Inside The Bubble' are NOT good enough if you want to be successful long term. These seem to be slightly harder than POM wheels, so I am guessing they are even less forgiving with anything even slightly out of spec. Personally, I found it easier to get the correct tension on my rails with these wheels. Too loose, they wobble, too tight, they bind and whine/grind. And if a post or gantry is slightly off, that makes what is 'just right' in one spot either too loose or too tight in another. If your printer is fine tuned from a structural frame level, these wheels are great! Now, I just have to see long term, and will update if any issues.

I had ordered 4 of these mini v-wheel gantry plates with a specific project in mind and had used one of the pictures provided by the seller on the product page to make my decision. One picture shows the product with flat style screws that should have allowed me to flush mount something to the plate, however the product I received have pan style, which is shown in other pictures on the page. These pan style screws stick above the plate and will not allow for a flush mount over them. Also the product supplied had been assembled incorrectly, the recesses for the screws were occupied by the spacers and eccentric nuts rather than the screw head, this wasn't a big deal for me as I was going to examine the components anyways, but totally independent of the flush mount problems, the way they assembled these would not allow you to slide the gantry onto a 2020/2040 extrusion. The biggest issue with my products is that the bearings do not have a tall enough shaft to allow you to tighten the wheels down and still allow the wheels to freely spin. As soon as you snug down the nut,even slightly, the delrin wheels and/or bearings will rub on the fastening nut and the eccentric nut or spacer. This makes all movement jittery and require excessive force, plus the wheels won't predictably rotate so flat spots will develop. In my case to fix this I had to break apart each bearing set on each wheel, remove the internal bearing spacer they placed in there and replace with another vendors shim, and use the removed bearing spacer as a washer between the bearing and carriage spacer/eccentric nut, and then finally tighten it alltogether with the lock nut upside down (so the narrower part of the lock nut contacted the bearing).Once all of these issues were corrected the carriage moves smooth enough to work in my application, but this required me ordering severl parts from other vendors, and the wheels are still not as smooth as I would like.The carriage and eccentric nuts fit standard 2020 or 2040 extrusions and has enough adjustment capability to let you snug them down so no woble exhists. The carriage does not show any bow or bend to my eye when mounted onto the extrusion.

The bearings themselves are great, but I was needing the wheel to slot into a 5.5mm track and the picture shows it is 5mm, but they came and they are 6mm just like all the other v wheel bearings. I'm upset that I bought another set of bearings that will not fit.UPDATE: This seller has been in contact with me the entire time and found out that their listing had a typo for sizing. They immediately changed the listing to be more accurate.

Used these to replace all the wheels on my Ender 3 Pro, since the previous replacements I purchased had QC issues causing a "rocking" noise when the wheels moved, which was due to unwanted friction due to a bearing issue.Replaced every wheel with these, and now my print quality has gone way up, and things are way smoother! 10/10 totally recommend if you are looking for replacement rollers.

One would think it would be on the money. but it was not precise. I bought 8 unit, 2 are tight fits, 4 just right, 2 very loose. it came un adjust all loose, just assemble. I have to tight make modified to meet the need.

As others have commented, when trying to tighten the eccentric nuts to the proper tension, the roller wheels seem to bow out and not make perfect contact with the rail. I am not sure if the length of the screws and spacers are not quite long enough (it barely clears the extrusion when applied) or if the holes are just a millimeter or so too close together in the plate itself.The assemblies may have worked fine that way, but I feel like the roller wheels should make perfect contact as i was using this on a home built laser engraver frame and it needs to be durable and accurate.I did try to modify the plates by drilling them out a bit, but still was not fully satisfied with the results. As I have kinda hacked away on them, I am not returning them. On the plus side, the wheels, bearings and other hardware seemed fine.I will just keep them in my parts bin for another use. Hope you found this review useful and it will save you some headaches and time.

Trabajan a la perfección y son muy suaves de muy buena calidad quedan muy bien en el perfil de 20x20

Lo usé para usarlo sobre un eje 20x20 y las ruedas coinciden perfecto.