Snap together Spool Holder - No extra hardware required!

I was looking for a spool holder that I could completely 3D print,
was stable and I could easily swap out the Filament rolls. I couldn't
find one already made so I made my own. I didn't want to use
screws or nails, or bearings. So I took a basic concept and
modified it. It took me 4 versions to tweak it just right.
Now I just drop different rolls of filament onto my spool holder.
I even store my filament rolls with extra spools with the
connectors.
The large spindle i