42 Engineering services; engineering services, in the following fields: 3D multi-material printing, especially, in the sub-micrometre range; engineering services, in the following fields: 3D multi-material printing, especially, relating to the following sectors: free-form polymer micro-optics; engineering services, in the following fields: 3D multi-material printing, especially, in the following fields: photonics packaging; technological services, relating to the following sectors: assay services, evaluation and quality control; technological services, relating to the following sectors: assay services, evaluation and quality control, in the following fields: open-fluid, automated material exchange in multi-material print heads; research and development services, in the following fields: development of materials; research and development services, in the following fields: development of new materials in the field of multi-material 3D printing; research and development, in the following fields: multi-material 3d printing for technical, physical, biological and medical uses; chemical product development for use in lithography; development of photoresists for lithography; development of new technology for others; software design and software development, for use in the following fields: control, regulation and monitoring of lithography devices; software design and software development, for use in the following fields: control, regulation and monitoring of 3D printers; software design and software development, for use in the following fields: control, regulation and monitoring of laser lithography devices; computer software development for others; software design for others; design of mathematical models.