Reduction for large diameter spool filament
thingiverse
The inside diameter of the filament spools is normally approx. 52 mm or large 72 mm. The two reductions are placed inside the large diameter filament spools to adapt them to the normal supports used usually which are 52 mm. I personally use this filament spool holder: https://www.thingiverse.com/thing:4506836 which is only to for coils of small diameter 52 mm. With these reductions I can also use coils that have a diameter of 72 mm.
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