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1. A method for manufacturing a reflector, wherein the reflector comprises a reflector wall, the reflector wall comprising a first wall surface and a second wall surface defining said reflector wall, the reflector wall comprising a light transmissive material, wherein the reflector wall has a first dimension and a second dimension defining a first reflector wall area, wherein each wall surface comprises a plurality of parallel arranged elongated corrugations, wherein the corrugations have corrugation heights relative to recesses between adjacent corrugations and corrugation widths defined by the distance between adjacent recesses at the respective wall surfaces and corrugation tops relative to the wall surfaces, wherein the corrugations have curved corrugation surfaces between said adjacent recesses having corrugation radii at the respective wall surfaces, wherein the method comprises providing a filament of 3D printable material and printing during a printing stage said 3D printable material on a receiver item with a fused deposition modeling (FDM) 3D printer, to provide said reflector, wherein the printing stage comprises varying over at least part of one of the first dimension and the second dimension one or more of (i) the corrugation heights, (ii) the corrugation widths, (iii) the corrugation radii, and (iv) a shortest distance between corrugations tops configured at different wall surfaces over said wall dimension for at least one of the wall surfaces by controlling 3D printer method parameters.
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