Bearing& Support,Ideaker Horizontal 8mm Dia Linear Motion Ball Bearing Slide Bushing &400mm Linear Shaft Optical Axis with Rod Rail Support Set of 16

I expected a bit better quality for $35. My initial impression is that they are about what I expected. Almost all the rods are straight, within a few tenths of an inch. On the worst, it is 3mm thick. bearings seem to be in good shape--these are the first ones I've seen. One was a bit rough at first, but working it with a little oil managed to remove the muck. It is important to note, however, that the support blocks are of rather poor quality. It is impossible to clamp the rod in place because the holes are oversized. There is still around a quarter millimeter of play in the lock even when fully closed (which requires such high torque that an allen key wrench will most likely break). In addition to the size of the screw hole, it is also oversized, leaving very little area for the screw to touch. Additionally, the amount of force needed to drive the screw into the support block further compounds the problem. As you can see, the screw is mostly sitting on top of the I am not happy with the machining of these and I noticed that several of them contained overcuts, such as the one shown below where the rod seat is cut into. A single block in the kit was able to fit even slightly snugly, out of the eight included in the kit. There were 7 others that were just as bad or even worse than the one pictured. The only downside to this is that I'm not sure if I'll bother returning the items since everything else seems fine so far, I needed it right now and I can easily buy replacements for these faster than the seller could likely send another set that would probably also be defective.

Ermias FINCH

| Dec 01, 2020

Only one rod was straight enough to work for my needs. The bearings made an audible grinding noise and stuck continually. The only reason I gave it 2 stars was because I'll use it for something else in the future, and it was shipped on time.

Nyla Morris

| Dec 28, 2020

My 3D printer was set up using this instead of the factory settings. It is much smoother to.

Amaya Merrill

| Mar 01, 2021

There is a greater resistance to sliding with linear bushings than you can find in 3D prints. Although the mounts work fine, they don't do a great job of preventing a rod from sliding while mounted. I am not a big fan of the design, but you get what you pay for.

Aleena Fields

| Feb 18, 2021

I really like this product.

Izaiah Gilbert

| Apr 12, 2021