
The 3d printer is a reprap. It is credited on their site and in many of their talks. It's not "rebranded", reprap is an open-source device so it doesn't have a "brand". They use a couple of other open source hardware projects as well - for instance, the multimachine. They're not out to reinvent the wheel, they're just out to unpatent it where necessary.
You don't need a paper making machine or a printing press to build a civilization capable of making a paper making machine or a printing press. You'll note they also don't have espresso machines, personal massagers, or many other lovely and useful devices on the list that we'd all like to have access to; that is because the machines that *are* on the list are what you need in order to manufacture those items (and, more importantly, other machines that can automate the manufacturing process for you).