Anyone know what this sound is?

I started to set up this morning in hopes to finish a piece from yesterday evening and this sound is happening on the Z-axis when moving it down. Is something too tight? Do I need to lube the rails? Video of sound on google drive link below.

https://drive.google.com/file/d/1RZNi_gjioWPhdU-7rCO8W3NMHj5sIeyD/view?usp=sharing

If I do need to lube it is this okay?

I tried adjusting the anti-backlash nut some more and the sound seemed to go away. kind of

@Swinly If anything, Lonnie, it sounds to me like your anti-backlash nut is too tight. I would suggest backing it all the way off to see if the noise goes away. If it does, then tighten only enough to take out the backlash.

As for that lube, Sienci recommends against dry lubes for the linear bearings. Take a look here for more details:

https://sienci.com/?s=lubrication

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