MGN12H 200mm Linear Guide Rail Slide - High Precision for 3D Printers & CNC Machines | Smooth Motion for DIY Projects, Robotics, and Industrial Automation

Buying inexpensive linear rails is a total hit or miss. Hiwin is the way to go, but man they're pricy. I really wanted black rails as well, so I figured I'd give these a shot.Ordered two - packaging was meh, they were of course covered in oil to prevent corrosion, but overall the rails moved pretty well. Both rails arrived straight and true, and there's no play in the carriage which is nice too. Properly cleaning and lubricating these made a world of difference, as expected, and so far they've been on my Ender 3 v2 with great success. One had some very minor rough spots that have seem to smooth out without introducing any play, which is always worrying but nonetheless.These aren't the Hiwin rails by any means, but I'm quite delighted with the quality for the price point and plan to buy more in the future. Will definitely update this after I've had some more time with them, but I've had them in use for about 3 weeks now and they've been treating me well.