Usongshine MGN12H MGN12C Linear Rail Guide, Mini Linear Guide Bearing Steel Slide Guide Rail for 3D Printer and CNC Machine(250mm, H-TYPE)

I purchased a few of these linear rails for a project and whilst they certainly aren't as smooth as a HIWIN rail out of the box these rails offer fantastic value for money.One did have a binding issue which needed to be rectified with a full teardown to clean the carriage thoroughly before lubrication.

Binds in 2 spots on rails I brought, slightly different but definitely need to look into the cause a bit more when I get chance, all on the ends, at least 1mm of "sticktion" I'll update once I've polished and found a better solution

Update: I just bought another one of these. The below review stands - I don't think I'll ever switch to any other supplier for railsWhen you look into rails, everyone looks to HIWIN for great rails. I have had rails in the past that disappointed me gravely. So when I bought this, I wasn't expecting much, and I had already designed a system to make up for the poor quality of cheap rails.However, when I got this rail I was at a loss for words at the quality.The movement of the rail was smooth like a hot knife through butter and the sliding block had absolutely no wobble and no give whatsoever. Quite honestly, the price of this rail is well worth the money.With cheap rails you may need two rails or two blocks to make a bedslinger stable, but I daresay a single one of these will do it.This is where I will get all my rails in the future.

As descibed and good quality fitted to cnc 3018 max as third guide rail to stiffen x axis

Unfortunately a very low quality item that is not the effortless glide they are meant to be and very loud

laser engraver