> Zap mailed started out meeting some of these, but rapidly became expensive, slower (had to wait for a delivery), less convenient (only sends to FedEx offices), and didn’t maintain a significant lead on quality.

> You could easily draw a parallel to, say, 3D printing as a service.

Or you could draw a parallel between 3D printing and 2D printing as a service, which sustained a number of businesses like Kinko's.