Three-dimensional printer and method for fabricating a three-dimensional object

An apparatus for manufacturing a three dimensional object comprising: means (102) for storing a supply of building material (39) which can be used parafabricar the object, a vacuum system having an inlet (112) of vacuum connected to means storage (102); a means for receiving incremental layers of construction material (39) in a chamber deconstruction from the storage medium (102); yun means (230) for receiving an excess amount of construction material (39) elmedio transferred from storage but not received by the build chamber; and characterized by: at least one filter (118) within the vacuum system to filter the building material (39) starting from an airflow created by the vacuum system (110); yun cleaning mechanism for cleaning the at least one filter (118).