This spacer fills the gap between larger hub filament spools and the spool holder. This was designed using dimensions from the CR-10S Pro, but should also fit on other CR-10 series printers.
If this piece has helped you, tips are welcome and always appreciated!
Update (2/8/19) Adjusted tolerances for better fit, smoothed round edges, added files for recessed hub spools (matterhacker, flashforge, etc.), and printing both spacers together.