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Summary The Lyman Cardboard Filament Spool is designed for use with the Lyman's Filament Extruders Versions 3, 4, 4.1 and 5. It is simple and cost almost nothing if on hand scrap material is used, such as cardboard. The designed spool holds 1 kg of filament used in 3D printers. Instructions Download the Manual pdf file and the stl file and follow the instructions in the 4 page Manual.