I previously suggested that Proto Labs (NYSE: PRLB ) offered limited upside. The stock is up around 16% since then, due to a combination of improved cash flows and growth. CapEx is unsustainably low at the moment, though, and Proto Labs' revenue mix continues toRichard Durant is the leader of Narweena, an asset manager focused on finding market dislocations that are the result of a poor understanding of a businesses long-term prospects. Narweena believes that excess risk adjusted returns can be achieved by ...