Three-dimensional printing process for obtaining a manufactured article with material effect, the process comprising - at least one supply step of at least one image in digital format reproducing at least one wooden surface portion provided with a plurality of grains, comprising a plurality of pixels; - at least one identification step of at least one color range datum of each of said pixels by means of at least one software; - at least one transformation step of said color range datum into at least one depth spatial datum to produce at least one three-dimensional digital model of at least one manufactured article with material effect provided with at least one outer surface reproducing said grains by means of a plurality of grooves with variable depth; - at least one three-dimensional printing step of said model to obtain said manufactured article with material effect by means of at least one molding device (10, 13); and - at least one painting step of said outer surface by means of at least one paint, said paint accumulating in said grooves and reproducing said color range of said grains characterized in that said three-dimensional printing step comprises: - at least one supply step of PVC and of at least one solvent in which said PVC is soluble; - at least one mixing step of said PVC and of said solvent to obtain at least one mixture in the liquid phase; - at least one distribution step of said mixture onto at least one deposition plane; - at least one evaporation step of said solvent to obtain one layer of PVC of said manufactured article with material effect, said evaporation step being subsequent to said distribution step; and - repeating said distribution step and said evaporation step to obtain a plurality of said overlapping layers of PVC forming said manufactured article with material effect. - at least one supply step of at least one image in digital format reproducing at least one wooden surface portion provided with a plurality of grains, comprising a plurality of pixels; - at least one identification step of at least one color range datum of each of said pixels by means of at least one software; - at least one transformation step of said color range datum into at least one depth spatial datum to produce at least one three-dimensional digital model of at least one manufactured article with material effect provided with at least one outer surface reproducing said grains by means of a plurality of grooves with variable depth; - at least one three-dimensional printing step of said model to obtain said manufactured article with material effect by means of at least one molding device (10, 13); and - at least one painting step of said outer surface by means of at least one paint, said paint accumulating in said grooves and reproducing said color range of said grains - at least one supply step of PVC and of at least one solvent in which said PVC is soluble; - at least one mixing step of said PVC and of said solvent to obtain at least one mixture in the liquid phase; - at least one distribution step of said mixture onto at least one deposition plane; - at least one evaporation step of said solvent to obtain one layer of PVC of said manufactured article with material effect, said evaporation step being subsequent to said distribution step; and - repeating said distribution step and said evaporation step to obtain a plurality of said overlapping layers of PVC forming said manufactured article with material effect.