An interview with 3DEO’s Matt Sand. While there are many research firms working in the 3D printing industry, Wohlers Associates, Inc. is certainly one of the most well known. Each year they publish a report that attempts to define the size and scope of the additive manufacturing market. For 2018, they estimated a market size of over $7 billion and a growth rate of 21%. But perhaps most intriguing was their data regarding the growth in metals. According to the team at Wohlers, around 1,768 metal additive manufacturing systems were sold in 2017, which is nearly double the 983 systems that were sold in 2016.