To print an ultimate spool holder, you need 608zz bearing.
The Ultimate Spool Holder
https://www.thingiverse.com/thing:2047554
Product Name : Ball Bearing
Size : 608ZZ (Dual Shield)
Material: Chrome Steel,Gcr15
Lubrication: Oil
Closures: 2 shield, can’t be removed and re-installed again
Dimensions: 8mm x 22mm x 7mm
ID (inner diameter): 8mm
OD (outer diameter): 22mm
Width: 7mm
*Please take note that some bearing named 608Z but with dual shield. They are actually same as 608ZZ
Inner Color may different