Wood spool rollers are definitely not something you see everyday! Looks super stout… could probably handle the weight of lead filament if there were such a thing.
I made some printable spool rollers that fit 21quart Rubbermaid sealed containers. They keep my “active” spools in desiccant boxes; with a PTFE tube bulkhead on each box, swapping filaments is pretty quick and the dessicant rarely see’s “fresh air” as a result. The whole setup actually eliminates a lot of dehydration work from printing (important for me as I print nylon and other sensitive stuff).
Probably not needed, but here’s the .dxf for the spool holder, and an STL for the part that holds the nut and bolt. (1/2" wrench size, 5/16" bolt. Probably OK for 8mm bolt w/ 13mm head with a little force to put the head in.)