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This is very much a work in progress, just a basic idea really, put it on so better designers than me can input or change/improve I am working on both mechanical and electrical ideas to link the spool mechanism to the cam mechanism. Mechanical gearing for 1.75mm filament a ratio of 30 to 1 is about right for 3mm filament 18 to one would be resonable Not electrical minded so have a friend working on stepper motor drive, I will add the threads to the relevant parts for ready printing PLEASE NOTE--ALL SIZES ARE NOMINAL ONLY , JUST TO AID ASSEMBLY MATES