The Onefinity manual states that oil should be added to the oil ports of the ball screws periodically.
Where is the x-axis oil port on the X-50 Woodworker?
I can find the oil port screws for the y-axis but not for the x-axis.
Can anyone help?
looks like yours has fallen out?
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Fallen out from where? I don’t see a hole.
unscrewed it self. Look at the link we linked to.
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Thank you for the image showing where the screw should be.
There is a matching hole on the other side (router side). Should there be a screw there as well?
This is truly odd. It seems I’m also missing the screw. I wonder if this was an issue with the batch of machines because I’m quite certain this is how my X-50 Woodworker came (might have to find videos/photos to see if I happen to have a shot from an angle that shows it). 
Only one side should have an oil port, the other doesn’t need one as the ball nut inside does not have a spot for it. (see picture)
I had the same problem. It was missing when the machine shipped. Contact OneFinity and they will send you a replacement.