A container comprising a housing that is configured to rotatably mount a filament supply spool, and a filament guide mechanism mountable within a channel of the housing, where the filament guide mechanism comprises a filament pathway configured to guide the filament from the filament supply spool rotatably...http://www.google.es/patents/US8157202?utm_source=gb-gplus-sharePatente US8157202 - Filament container and methods of use thereof
