Spool holder bearing

I designed this simple roller bearing. Simply push fit the bearing into filament spool and they should slide easily into Ender 3 stock spool holder. This bearing helps the filament spool rotate smoothly and concentrically to the stock spool holder.

You would require 2 x roller bearings to be fitted on each side of filament spool. Take note that the extra height on inner ring act as spacer and should be facing outwards after fitting onto filament spool.