Note: 3D printed spacer no longer included.
Masterspool - Empty Spool - Filastruder
Produce and supply empty 3D Printer Filament Spools in PLA, ABS
Why can't all filament manufacturers do this? : r/3Dprinting
500g spool 3D Models to Print - yeggi
Produce and supply empty 3D Printer Filament Spools in PLA, ABS
LockSpool V3: Parametric, reusable (1 part printed twice) by
Introducing Veracity Filament - Filastruder
Introducing Veracity Filament - Filastruder
New Year, New Spool
Cardboard Spools? : r/prusa3d