Befenybay 200mm Travel Length Linear Rail Guide Ballscrew SFU1605 with NEMA17 Stepper Motor for DIY CNC Router Parts X Y Z Linear Stage Actuator

I bought the 400mm version and it works great. Extra star for great customer support - my unit was damaged during shipping and the seller sent replacement parts quickly and at no charge.Regarding other reviewers who report the carriage as "loose": you just need to adjust the four bearings on the carriage for a close fit. My unit even came with the wrench needed to make the adjustment.Overall very nice product.

The unit came with a few minor scratches. But more significantly, the build quality shows it is not 'Made in Germany': the black aluminium plate at one end of the rail was not at a 90 degree angle with the rail, because one of the round stainless steel rods running the length of the rail was about 2 mm too long (thus forcing the black plate out of proper alignment). I have shortened the offending steel rod and properly aligned the black end plate. The unit is working, and the sled moves without any wobbling. However, the unit is not the most impressive display of workmanship.

I am trying to put it to work, but I did expect it to be shipped complete. the motor was not attached to the guide rail, and no screws were provided to attch the motor. For now, no testing, just looking for the right screws.

Purchased for some prototyping due to low cost. Over the next week or so slammed into end no less then 3 or 4 times and it kept hammering away until I pulled the power. No ill effects. Wheels adjustable. Solid. Don't know if the screw is rolled or ground but will buy some longer ones from them for sure.

I bought 100 mm for a Z axis first. After I got it I decided to replace x & y with the same type to open up work area a little more. The rails are about 1¾" wide instead of the 4" wide slides I had.. So far so good. The only issue I have is I don't see a grease fitting. Otherwise its actually better than I expected. A couple loose bearings were an issue until I figured out how to adjust. I just swiveled the loose ones until I felt a little bit of drag on each... Made from good quality materials & the finish is nice. All in all if they hold up for a year they're worth it.. only 4 stars because of there's no instructions for adjusting bearings & the lack of an accessible grease fitting.