G-AFR (Auto-Filament Retracting) Spool System

G-AFR (Gravity-Auto Filament Retracting) Spool System is 100% printed, a spool holder system to auto-retracting filament during multi-colour filament printing.This is to work with AMS-Lite / AMS micro mod and with DIY drybox.The auto filament retraction works with gravity, when the AMS-lite pull back the filament by short distance, the spool holder helps to retract the filament into the spool.The usage is for multi-colours print, especially when you have tens or hundred of filament changes, each