The 3D printing (3DP) space is rapidly changing. There are many startups and larger companies developing and commercializing various technologies and applications. This report provides an overview of recent 3DP innovation trends. To begin, we analyze the innovation interest, track record, and momentum of top 3DP processes and materials. Next, we identify and illustrate eight common innovation trends in the polymer and metal 3DP space. Importantly, we find that the development path of each technology is strongly dependent on the technology’s technical maturity.