For a moment this winter, Fried Vancraen and Hilde Ingelaere, the founding couple behind 3D-printing firm Materialise saw their wealth soar past $2.6 billion, by Forbes’ calculations, as the company’s stock topped $80-a-share. Easy come, easy go: As 3D printing stocks have fallen, the Leuven, Belgium-based company has seen its shares drop to a recent $41, making the couple’s 60% stake worth $1.3 billion.
