I remixed the spool holder by TheKre8Group ( https://www.thingiverse.com/thing:32204 ) to fit my spools that have a bigger inner diameter and made it larger by ~2cm
I also added axis for 608 bearings.
I gave the arms of the base a little tilt so they don't touch the spool while rolling.
I narrowed the base down to a 10cm width.
(If you need a more simple version without bearings with an even more narrow 9cm base, check out my other remix.)
How to print?
I used PLA with a .3mm resolution for the base and a .2mm resolution for the axis.
I reckon it's best to print successively and not together to make them more precise.
No support needed, just print everything upright.
My axis was inspired by these two spool holders https://www.thingiverse.com/thing:3020026 and https://www.thingiverse.com/thing:3338467 .
The author hasn't provided the model origin yet.