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Very nice design, which I have pretty much printed by now. After a lot of files-sorting...

You do pride yourself on not wasting filament while at the same time omitting any form of direction for the rest of us to do the same.
There are so many pieces with no immediately recognizeable meaning/function to them.. like the bazillion bases with slightly different names with no reference to function (for normal people not initiated into the aluminium-extrusion World)

The Centerring_and_lockingconenarrow.stl is another issue... I did not know narrow = if you want to use it to Lock it.

How do you make the rollers stay inside the spool-spindle? nails, or?