Again i am not intimately familiar with 3d printing technology, but the timing of at least some of those announcements might be due to expiration of relevant p

Again i am not intimately familiar with 3d printing technology, but the timing of at least some of those announcements might be due to expiration of relevant patents, rather than the invention of new technology. https://techcrunch.com/2016/05/15/how-expiring-patents-are-ushering-in-the-next-generation-of-3d-printing/ https://techcrunch.com/2016/05/15/how-expiring-patents-are-u...