A three-dimensional printer for additive manufacturing of a part , the three dimensional printer comprising: a build platen for supporting the part to be manufactured; and a print head including or connected to a fiber composite filament supply loaded with thermoplastic-pre-impregnated fiber composite filament including one or more inelastic axial fiber strands extending within thermoplastic matrix material of the filament ; wherein the print head includes a first heating zone between the fiber composite filament supply and a heated nozzle , which first heating zone is heatable by a first heater above the melting temperature of the thermoplastic matrix material to pre-heat the pre-impregnated fiber composite filament ; a consolidation element located after the heated nozzle , to apply a consolidation force and/or compaction force to the fiber composite filament to attach the fiber composite filament to the part , wherein the consolidation element opposes at least one of the build platen and previously printed structures of the part, the heated nozzle being heatable by a second heater to at least the melting temperature of the matrix material to heat the fiber composite filament ; a filament drive to drive the fiber composite filament including the one or more inelastic axial fiber strands, through the first heating zone into the heated nozzle , at a selected feed rate; a cold feed zone between the filament drive and the first heating zone , to maintain the temperature of the fiber composite filament below the melting temperature of the matrix material; a non-heated heat break zone between the first heating zone and the heated nozzle to create a temperature gap between the first heating zone and the heated nozzle ; wherein the three dimensional printer comprises a plurality of actuators to move at least the print head including the consolidation element relative to the build platen in three degrees of freedom. a build platen for supporting the part to be manufactured; and a print head including or connected to a fiber composite filament supply loaded with thermoplastic-pre-impregnated fiber composite filament including one or more inelastic axial fiber strands extending within thermoplastic matrix material of the filament ; wherein the print head includes a first heating zone between the fiber composite filament supply and a heated nozzle , which first heating zone is heatable by a first heater above the melting temperature of the thermoplastic matrix material to pre-heat the pre-impregnated fiber composite filament ; a consolidation element located after the heated nozzle , to apply a consolidation force and/or compaction force to the fiber composite filament to attach the fiber composite filament to the part , wherein the consolidation element opposes at least one of the build platen and previously printed structures of the part, the heated nozzle being heatable by a second heater to at least the melting temperature of the matrix material to heat the fiber composite filament ; a filament drive to drive the fiber composite filament including the one or more inelastic axial fiber strands, through the first heating zone into the heated nozzle , at a selected feed rate; a cold feed zone between the filament drive and the first heating zone , to maintain the temperature of the fiber composite filament below the melting temperature of the matrix material; a non-heated heat break zone between the first heating zone and the heated nozzle to create a temperature gap between the first heating zone and the heated nozzle ; wherein the three dimensional printer comprises a plurality of actuators to move at least the print head including the consolidation element relative to the build platen in three degrees of freedom. <EOS>