Linear Ball Bearings, LMF8UU 8mm Round Flange Linear Motion Bushing Double Side Rubber Sealed for 8mm Linear Shaft CNC Machine 3D Printer 4 Pack

True to dimensions and do the job.

All four Z-axis plastic linear bearings failed on my TronXY X5SA Pro 3d printer, most likely due to the lack of synchronization from side to side. These were perfect replacements for the plastic OEM linear bearings which all split from top to bottom. These were installed in conjuction with the TronXY synchronization belt and pulleys available as a kit direct from TronXY, if you want to piecemeal your own they are 24T pulleys and 1068mm closed loop belt. Also installed preloading nuts on the Z-axis drive rods and more rigid couplers. Overall a major improvement in Z-axis stability. Apparently TronXY realized that the linear bearings were problematic since they now offer comparable parts for purchase as replacements.

Just what we needed

Bearings were alittle sloppy. Great Seller communication and was able to return.Thanks

I build weird projects for one off uses and so I need linear motion systems. What I don't need are super precise linear motion systems, so I am fine getting items with a little slop in them or that run rough, which these do. For the stuff I build, I can get away with it, but if you're dropping a rover on Mars, you probably want to consider something a little more precise.

Good quality material and built as it should be. Worked as needed.

I kinda think it's the rod I'm using more than the guides, but it's a bit rough. It's likely a little of both. I think I may take sand paper to the rod and see if it helps. Otherwise, this is going to be a great addition to my home built 3-d printer. Outside seems smooth, and well made, definitely slides smoother than a bushing.