Creality 3D Printer POM Wheel Plastic Pulley Linear Bearing for Ender 3/Ender 3 ProEnder 3 V2,CR-7,CR-8,CR-10,CR10S,S4,S5 (Pack of 10)

Ive purchased these wheels 4 times. Out of the 40 wheels I purchased, 9 were good, meaning that less than 10% are truly usable. I have a self designed device to test the trueness of the wheels to confirm their quality, but there is a visible difference between the usable/true wheels, and the wobbly/inferior wheels. Ive added a photo to show the difference. The left wheel is a good wheel, the right wheel is inferior. You can see lighter/more reflective metal on the interior of the bearing, as well as warmer black color and matte texture on the good wheel. The result of wobbly/inferior wheels is that 3D prints will have defects like noticeable shifts in layers, or poor bed leveling if used for the build plate, even with a Bl-touch or other bed level tool in use. Unfortunately, I have no idea where to get the OEM wheels that are installed on the printers which appear to be of good quality.

I replaced the wheels on my X gantry when I upgraded my hot end, direct drive mount, and ducting. It took me days of failed prints to figure out that the wheels were a tiny bit out of true, which was hard to detect. The first layers on my prints were wonky, like a loose gantry, and I had an odd spiraling Z- axis deviation. Im mad that something as simple as bad, brand new wheels caused so much frustration. Seems like it is very hard to get quality parts these days.

Works perfect for my CR10s Pro. Only issue I had was 4 of the 10 had bearings with flat spots you could feel when installed. Thankfully I contacted the seller and was sent a new set. The new set had only one bad bearing so if you need all 10 in good working order you will have to wait longer but the new set was sent within one week.

As the title says, Im not sure if I tighten the wheels too much to the rails but I can see and notice bits and pieces of the wheel falling apart. But overall the wheels perform well as a replacement to my Tronxy-2 wheels which were worn out and making my heat bed wobbly. Now with the new wheels I head bed is no longer wobbly and is very stable. But I have a eerie feeling I may have tighten the screws too tight which might be causing the shavings or pieces of the wheels rubbing off onto the table and head bed. See pictures.

These wheels are extremely tight - they make it difficult to move the motors

these are good bearings took out a lot of noise and wobble in the Z axis.

Used on a robot arm. Works well

After replacing the wheels on my ender 3 v2, the bed wobbles so i cant even level it properly. 2/3 of the wheels I replaced on the right side arm dont even touch the rail, so all of the weight and pressure is on the bottom wheel. Im quite disappointed with these. Will have to look elsewhere.

Some of these may be OK, but after swapping the old wheels on my CR10 bed with these, I noticed a distinct catch in when moving the bed by hand (without the belt connected), and it repeats about every 70mm which is the approximate circumference of these 24mm wheels (where they contact the rails is less than 24mm). I winnowed the batch down to the best and the problem is reduced but it is still present. I have read that can be due to several factors, so I will update this review once I am sure of what the problem is.

Garbage half of these wheels aren’t true centered and the quality control is god awful pieces missing from my wheels as well would not buy again!