These days, there are tons of different materials available for 3D printing; from basic materials like ABS, PLA, etc to complex and precisely engineered materials like PEEK, PA12, etc. So, the question still remains: which material should you be going for? The answer is not very simple since there is no single material type that fits all applications and is suitable for all users. The choice of material can be based on physical appearance, application criticality, environmental conditions, ease of operation or even printer limitation. In order to make things easy for the people starting with their first 3D printer as well as for the curious minds who want to understand about common materials, we are starting with four common materials which are ABS, PLA, PET-G and TPU. We are listing down two reasons to use and two reasons not to use these materials.