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Linear rails in the Sapphire Pro, Plus and probably S are **not cleaned and lubed** after machining. They are covered by some kind of oil or petroleum which protect them from rust. You **should clean and lube them** if You want from them **the best performance**. Properly cleaned and lubed chinese linear rails provide **better surface finish**. Here is my video about cleaning these rails: https://www.youtube.com/watch?v=1BL7Zni-R0g --- ##Cleaning process in a few steps: 1. Remove the rails from the printer. 2. Take the carriage out from the rail. Be careful! Little steel balls may pop out at this point. 3. Unscrew all the parts from the carriage. 4. Put all the parts in isopropyl alcohol. 5. Clean the rails with paper towel soaked in isopropyl alcohol. Pay attention to surfaces on which the balls are moving. 6. Take all the parts out from alcohol. 7. Put them on dry paper towel and let them dry. 8. Do the same thing as in point 5 but for the carriage. 9. Assemble the carriage. **Don't tighten** the screws! Sweep seals have to be easily movable. 10. Put some lube on the moving parts. I have used white lithium grease but If You know better lube for this application tell me in the comments. Don't use thick grease because it will be slowing down the carriage. And of course don't use WD40! 11. Put the carriage on the rail. 12. Move it a few times, so all the parts will set on their place. 13. Tighten the screws. 14. Wipe off excess lubrication. 15. Done! :) --- After You clean and lube them, You will need to install them on their place. As I have seen on my sapphire Plus and Pro Two Trees is **not aligning** them properly. There is often **grinding noise** present and motion is not smooth. In order to fix these problems You will need to align them properly. For this You should use parts which I have prepared. They will set the rails on **right place and position** which will allow You to easily mount them back.

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