Summary

An adapter for M10/M12 screw (the adapter has 12 mm inner diameter) to spool hole (50 mm adapter external diameter), to let your filament spools to unroll easier on a M10 or M12 screw filament holder. It helps to align the center of rotation to the center of mass of the spool.

As a result, less force is required to the extruder motor to pull the filament from the spool.

Fast and easy to print :)