Replacement parts to have on hand just in case...?

I have some money that has to be quickly spent on keeping up a Glowforge Pro and am wondering if the community has suggestions for replacement parts to keep on hand. I know, extra money it’s a good problem to have. I’m buying a couple of filter cartridges because mine seem to fill up far quicker now than when I first got it, but are there other parts that are easily swappable if they break or start degrading? Cleaning the unit has kept in good shape for a few years, I don’t anticipate vastly increasing the use, and I don’t want to be kicking myself down the road if I lose money I could have used to fix something.

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Black and white cable
carriage wheels
pulley wheels
printer head lens
printer head window

(especially the first one)

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In six years before my tube failed, I never replaced any part. So it seems like that would be money ill-spent.

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