3D printing technologies are becoming more accessible, and the choice of the materials used for 3D printing is also expanding greatly. In recent years, environmentally friendly materials, such as wood-plastic composites, are becoming increasingly important. In our thesis, we studied how 3D-printed parts made of wood-plastic composite, PLA and ABS materials respond to surface treatment. During the experiment, we determined some basic coating characteristics and measured the contact angles of three test fluids on a 3D printed surface, on the basis of which we then calculated the surface free energy. We found that sanding improved the water-repellent properties of all materials and reduced the surface roughness. The adhesion of coatings was best on a wood-plastic composite substrate. We conclude that all the used materials can be surface treated and thus achieve the desired final appearance of the surface (gloss, colour) as well as the desired roughness.
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