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1. A method for producing a 3D item by means of fused deposition modelling, the method comprising a 3D printing stage comprising: layer-wise depositing an extrudate comprising 3D printable material, to provide the 3D item comprising 3D printed material, wherein the 3D item comprises a plurality of layers of the 3D printed material, wherein the 3D printable material comprises core-shell 3D printable material comprising (i) a core comprising core material and (ii) a shell comprising shell material, wherein the core material comprises a core thermoplastic material and core additive material, wherein the shell material comprises a shell thermoplastic material and shell particles, wherein the shell material is light transmissive for one or more wavelengths in the visible wavelength range, wherein the shell particles comprise specularly reflective particles, wherein the core additive material comprises one or more of diffuse reflective particles, white particles, black particles, colored particles, and dye molecules, and wherein the core material and the shell material differ in one or more optical properties selected from the group of color, reflectivity, type of reflectivity, and absorption of light.
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