3D Systems (DDD -9.1%) is finishing with big losses yet again. Shares are down 18% on the week, thanks in no small part to accounting concerns. Stratasys (SSYS -2.6%) is also lower. A CNET column this morning discussed remarks from industry experts about the future of 3D printing. "We're still living in a bubble a little bit," declared the CEO of 3D printing marketplace Shapeways, due to the fact the average person still isn't aware of what 3D printers can accomplish.