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you can purchase the belt and gears from Terawatt industires: http://store.terawattindustries.com/77-00str00der-belt-driven-extruder.html#/00str00der_assembly_options-belt_and_gears_only/00str00der_parts_options-no_nema17_motor

otherwise you can try Mitsumi, Stock Drive Products, or e-bay. Good luck!