n this thesis two 3D-pinted aluminium alloys will be compared. The company Lasertech LSH AB have vast experience with one of the alloys and wants help to find areas where the new alloy can be used. In this project, the quality of the alloys will be compared and evaluated by mechanical testing and material characterization. The comparison is made with modern technology in the form of a CT-scanner for assessing the quality of the different materials. Mechanical properties are assessed using more traditional tool such as a compression test. After the tests were carried out, there was some interesting knowledge about the differences for the alloys. The alloy Lasertech used previously (AlSi10Mg) showed better mechanical properties in thin structures as well as superior build quality in comparison to the new alloy (AlF357). But the print quality for AlF357 should further be examined due to a lot of powder residue left in the printed geometries and the material had a very rough surface. According to EOS (the manufacturer of the materials), AlF357 should demonstrate better mechanical properties in relation to AlSi10Mg. For further studies, post-processing according to EOS instructions can be done to investigate whether the differences between the materials are narrowing.