Conical Spool Adapter

I needed to improve my filament support system and thought a good way for doing so was to use some spool adapters I've seen here in Thingiverse. Unhappily, other designs I found didn't work very well for me, mostly for the wide range of spool sizes I use (from small 250g spools to 1kg spools from different sellers here in Brazil).

So this thing consists in 2 identical conical adapters that are used to centralize the spool to a 5/8" threaded rod and a common bearing (608 series) in each side, holding it all together with compatible nuts in both sides, providing *effortless* filament feeding to the extruder.

It should fit filament spools with central holes between 30mm and 75mm.

I included the original files (SolidWorks) in case anyone wants to tweak it a little bit.

For the printing, I used a 0.6mm nozzle with 0.3mm resolution, 2 vertical shells and 20-30% infill.