Chinese MGN rails. Should I use them?

[Boyan Silyavski]

I bought for my current build MGN12 and am very happy with the quality. I am super duper picky and "always Hiwin " type of a guy . Before a couple of years i have ordered a test 20 size rail and was Not ok to my liking.

To understand better what's happening - In China around every corner they sell linear rails at some places. Which means they make them in hundreds of places. Obviously quality differs. In worst case scenario you will need to change the balls with better ones. But my thinking was if i buy from big factory that makes them they will be good. So that was what happened. They turned good.

In short they needed cleaning the rails and the carriages and then were ok. Rails are really hardened and ground. carriages are made so that could be taken out from the rails without spilling the balls. the preload is adequate.


Here is the link to the manufacturer, he has good prices so my advice is not to experiment from other places. They know English and you can order custom configurations. had some problems with shipping which they corrected.

I have real MGN12 rails and carriages here, so i compared them side to side and i know what i am talking about.

But as i said if you buy from another place there is no guarantee that it will not be a lemon. The real problem is that normally only 3D printer guys and other amateurs compare them on the web and they never have touched real rails or had a serious machine, so in reality i couldn't find real information prior to purchasing, from someone that knows better. So it was a bit risky when i bought near 10 meters of them and some carriages. But i am happy without doubt and will do the job.

Hope that helps