Filament Holder Ender 3

I've been seeing occasional under-extrusion from my Ender 3. I noticed that the filament spool did not at all unwind smoothly. After changing the spool to rest on ball bearings on the table top those issues went away. However, I prefer the filament on top of the printer. So here is my take on a filament holder for the Ender 3.

Some additional non-3D printed parts are needed, in particular 4 608zz bearings and 2 axles. I used 8mm aluminum tubing, but 5/16 dowel should work too.

I also have