Put those valuation concerns aside Based on traditional methodologies, 3-D printing companies are undoubtedly overvalued. Stratasys ( SSYS -0.26% ) currently trades with a P/E above 90, giving the classic value investors the cue to avoid this sector like the plague. Motley Fool Co-Founder David Gardner has a different perspective on high valuations. He's not afraid of them, in fact he likes seeing companies that are called "overvalued" by the media. The link will take you to a short five minute video in which David explains the ins and outs of why high P/E's aren't necessarily a bad thing. This approach has allowed David to capitalize on buying "overvalued" companies like Amazon and AOL in the early days, which went on to make life changing returns for his portfolio.