A method of printing an orally-administrable immediate release, extended release, or delayed release solid dosage form comprising an active ingredient selected from selected from a pharmaceutical, a nutraceutical, and/or a food supplement, the method comprising: a) providing a solid dosage form printing apparatus comprising: a fused filament fabrication 3D printer; a build platform upon which the solid dosage form is printable; an active ingredient-containing printing filament, wherein the active ingredient-containing printing filament consists of, consists essentially of, or comprises an active ingredient-containing filament composition comprising: the active ingredient and an active ingredient carrier; optionally one or more further printing filaments, each suitably independently consisting of, consisting essentially of, or comprising a further filament composition; at least one extrusion nozzle through and from which the active ingredient-containing printing filament and optional one or more further printing filaments can be extruded; a computer for controlling the FFF 3D printer and optionally also the build platform; b) operating the FFF 3D printer to print the solid dosage form upon the build platform via a process comprising: i) printing the active ingredient-containing printing filament; and ii) optionally printing one or more further printing filaments; c) optionally performing one or more further processing steps. a) providing a solid dosage form printing apparatus comprising: a fused filament fabrication 3D printer; a build platform upon which the solid dosage form is printable; an active ingredient-containing printing filament, wherein the active ingredient-containing printing filament consists of, consists essentially of, or comprises an active ingredient-containing filament composition comprising: the active ingredient and an active ingredient carrier; optionally one or more further printing filaments, each suitably independently consisting of, consisting essentially of, or comprising a further filament composition; at least one extrusion nozzle through and from which the active ingredient-containing printing filament and optional one or more further printing filaments can be extruded; a computer for controlling the FFF 3D printer and optionally also the build platform; a fused filament fabrication 3D printer; a build platform upon which the solid dosage form is printable; an active ingredient-containing printing filament, wherein the active ingredient-containing printing filament consists of, consists essentially of, or comprises an active ingredient-containing filament composition comprising: the active ingredient and an active ingredient carrier; optionally one or more further printing filaments, each suitably independently consisting of, consisting essentially of, or comprising a further filament composition; at least one extrusion nozzle through and from which the active ingredient-containing printing filament and optional one or more further printing filaments can be extruded; a computer for controlling the FFF 3D printer and optionally also the build platform; b) operating the FFF 3D printer to print the solid dosage form upon the build platform via a process comprising: i) printing the active ingredient-containing printing filament; and ii) optionally printing one or more further printing filaments; i) printing the active ingredient-containing printing filament; and ii) optionally printing one or more further printing filaments; c) optionally performing one or more further processing steps.