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I did, they were mediocre at best. Now they have replacement sleds which make the same linear rails feel twice as good at least. In the last batch at least ... https://www.banggood.com/Machifit-MGN12H-Linear-Rail-Block-for-MGN12-Linear-Rail-Guide-CNC-Tool-p-1186173.html

It might even be acceptable for them to not have grease ports, because they are so cheap. For the linear hardware video I have also bought some of the new black ones for comparison: https://www.banggood.com/Black-450mm500mm550mm-MGN12-Linear-Guide-Linear-Rail-Slide-with-MGN12H-Linear-Block-CNC-Tool-p-1270014.html

And a used Bosch Rexroth from eBay  😍 

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Marco Vujevic

Looking forward to the video on this. I recently upgraded my Prusa MK2 to a full MK3 and everything leftover that I need to build a little x/y sled for a little laser. Maybe I can draw some inspiration (and motivation) from your build :)

Jon Raymond

I had to buy the replacement sleds as well for the BG rails as the ones they came with were garbage. Traced it down to the wire holding the ballbearings in place being improperly formed.

marcoreps

Oh really? Interesting! I've ultrasonic cleaned and re-greased everything multiple times, that helped a bit too

Daddy Bearcat

Sounds like you got banged good... <.>

Anonymous

I got 4 MGN12C blocks and rails from them. The rails were slightly warped at the cut point, and one of the carriage blocks doesn't move as freely as the others. They were so cheap, though....