Minimalist Hardened Filament Spool Hub 608ZZ bearing

This is a simple minimalist hardened hub for filament spool with 608ZZ bearing. You can buy 608ZZ bearing on ebay. 608ZZ bearing has outer diameter is 22 mm, inner diameter is 8 mm and thichness is 7 mm. You can install easily because the trapeze form locking arm, but it holds the filament spool surely.
It prints for 40 minutes with Anet A2 Plus, 0,2 mm layer heigh, 0,4 mm nozzle, 100% infil, average 50 mm/sec speed.

UPDATE (01/02/2019): Dimensioning problem solved.