Wouldn't it be better adapted for laser cutting ?
Given we're talking near-exclusively flat pieces
Plus with Laser Cutting you could engrave a cool design on each side of the Card Feeder XD
3D printing could be used to extend the design's sides to make an awesomely shaped version that's much more stable, though, so there's probably potential with both Laser Cutting and 3D printing !
RE: Video Update - Card Feeder Prototype - Building process