
If you lose any bearing balls in one of these, consider it completely useless. 3/32" bearing balls are too large and will make the rails very hard to move. If you get a defective rail it will miraculously be even worse if you try disassembling it, cleaning and lubing it. Of the seven rails I have, one is so bad that it won't slide even if you hold the assembly by the carriage at a 90 degree angle.

Iverntech 400Mm MGN12 Linear Rail Guide With 2 Black Stainless Steel MGN12H Carriage Blocks For CNC Parts And 3D Printer Upgrades
8 Review

Iverntech MGN12 400Mm Linear Rail Guide Upgrade For Ender 3, Corexy, Tronxy, Delta Kossel 3D Printers And CNC Machines With Stainless Steel Carriage Block
12 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

Goodyear Ultra Grip Ice SUV 235/65 R17 108T winter
35 Review