New York-based Arc Public Benefit Corp. bought 3D printing pioneer Desktop Metal last month out of bankruptcy. The purchased followed about two years of merger-and-acquisition mania that shifted from assigning billion-dollar valuations on equipment makers to pushing some of the same companies through bankruptcy.  Bryan Wisk, CEO of Arc, says the path to future success is clear -- focusing on running the company instead of getting caught up in the buy-sell drama of corporate mergers.  “There’s only one word at DM right now internally; it’s focus,” Wisk says. “We’re not a distressed debt investor or private equity. We’re really deep-growth investors, and we’re looking to focus on the core technologies that we bought.” This Great Question episode features a conversation between Wisk and IndustryWeek Editor-in-Chief Robert Schoenberger