Adjustable threaded filament spool holder

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Awesome design Chris, thank you very much. I went to a welding/fabrication shop and got a set of good quality bearings for about $13, they slipped in on either part perfectly and had just the right inside diameter to fit the spool rod on my snapmaker 3 in 1 original. Perfectly smooth rotation, very happy with this design. Thanks again Chris. Don R. in Canada.

Nice design!
What's the outer diameter of the center cilinder?
I'm trying to see what spools fit in this.