Perfect fit ring of Prusament Spool for Simple Spool Holder Bearing

This is fit ring for Prusament Spool using "Prusa MK3 Simple Spool Holder Bearing"
– https://www.prusaprinters.org/prints/5616-prusa-mk3-simple-spool-holder-bearing

The spool holder bearing don't fit Prusament spool, which has 51mm inner diameter. 
So I make just fit ring of “Prusa MK3 Simple Spool Holder Bearing” for Prusament spool.
PETG filament is suitable material for the ring.

“Prusa MK3 Simple Spool Holder Bearing” is also required to use.