The ones that Misumi sells are the best and no way these will approach them. But you can buy quite a few of these for what a Misumi rail cost. They do need cleaned and relubed and in my case I replaced the balls with better ones to get them to be even smoother operating. They are nice and smooth operating on the Y axis of my printer.
Iverntech MGN12 700Mm Linear Rail Guide With 2 MGN12H Stainless Steel Black Carriage Block For 3D Printer And CNC Parts
6 Review
Iverntech MGN12H Linear Rail Guide With Stainless Steel Carriage Blocks - 700Mm Length For 3D Printer And CNC Machine
9 Review
Powerful And Waterproof Electric Micro Linear Actuator 12V With Mini Size And Mounting Brackets For Various Applications
11 Review
Upgrade Your Furniture With Happybuy 10 Inch Stroke Electric Actuators - Heavy Duty 6000N DC 12V With Mounting Bracket For Recliner, TV Table, Lift, Massage Bed, And Sofa
9 Review