What type of lubricant if any should be used on the onefinity rails?
Mark,
Standard 4 in 1 oil is what OneFinity recommends.
-Alex
is 4 in 1 different to 3 in 1 oil ?
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Is that different than 3 in 1 oil and if so where can I get it
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It’s 4-in-1 because Alex gives it a +1 
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I like that a lot!! +1 for @cyberreefguru … who’s keeping score?
LOL
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lol, I was gonna call you out on that Alex, but I was too late. 
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Amazon and the usual suspects for purchase:
However, I am not a fan, coming from mills and lathes - I used oil infused with PTFE for linear rails and dovetails:
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Good to know. I have some of that super lube in the shop and love it. Good stuff.
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Has anyone used a dry lube on their rails and ball screws?
I searched but did not find any discussion of it on this Forum.
Dry lube would not attract dust.
There are many suppliers, some have PTFE in them others do not.
I have not used dry lube. OF recommends 3 in 1 oil. I suspect any good lubricant that does not break down the bearings would work fine.
-Tom
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I used that on my Shopbot and use it on my CNC plasma. It’s cheap, works and doesn’t cause gumming or attack the non-steel parts. Just blow out the leadscrews and wipe things down every once in awhile to keep things clean.