Filament spool shaft ball bearing support (Samla project)

I'm building my filament dry box and I need a decent spool shaft holder.
I've saw this holder https://www.thingiverse.com/thing:2198955, but I doesn't like the way him inserted the BB into the ball bearing, too dangerous for 3D printer nozzle.
Casually discovered this project https://www.thingiverse.com/thing:1799757 that is a great idea (make a hole to insert BB's), so I drawed a new holder, merging the two ideas, to fit my needs.
The central hole is designed for aluminium shaft of 23,5 mm t