This is a remix based on the "Filament Spool Holder" by HugoHuge (https://www.thingiverse.com/thing:3020026)
and the remixes made by mjoaris (https://www.thingiverse.com/thing:3209211) and Keleo (https://www.thingiverse.com/thing:3222112)
I had a look into HugoHuge's design but printed out mjoaris because all my filament spools fit an this shortened version.
I had the same problem as mjoaris with the small shaft breaking off of the roller.
Afterwards I printed the roller with removable shaft (based on Keleo's design) but couldn't fit the roller into the housing with my 608z (just 1 z) bearings attached.
So I shortened the "shell" 1 mm and made both shafts pluggable.
This should be easily printed without supports.
Before you ask. I don't know why the shafts are not perfectly round. I couldn't convince Inventor to save it in the right manner... but it worked anyway
Here are some details:
wall line count: 4 (1.6 wall thikness)
Infill density 50% tri-hexagonal pattern
ironing enabled (just for besser surface on at least one side :-D but to be honest I forgot about this setting. In the end it didn't matter)
Added my Ender 3 Cura Profile as well if anyone is interested.