A modern PCB has the following:
1. Copper Traces
2. Copper-plated Through Holes (usually for Vias, but useful for through-hole parts as well)
3. Solder Mask (very important for surface mount parts)
4. Silkscreen ("Helper Text", marks that say R1 or "R2 goes here").
Given that I can order 3+ custom boards from USA suppliers for $70 or so (process in 3 days, then ship it so I get it within a week), or 10+ boards for $50 if ordered from China (takes a few weeks to travel though)... I think the modern PCB market is to just order from online.
"Immediate Printing" is well served by the CNC Mill industry today. But CNC-milled boards just aren't good enough for production purposes. Even if you're a hobbyist, all the good tech is in SMT parts which really need a good soldermask.
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What the technology discussed in the page will be used for is additive manufacturing. That is: the creation of new structures that are cheaper to do by additive means than subtractive means.
I can imagine a small circuit of size .5mm x .5mm for example that would be more efficient to "print" than to mill or etch.
I think their example of 3d Antenna built into a plastic board is the real idea behind the technology. Additive manufacturing is dramatically different than subtractive... and subtractive manufacturing is standard for a reason.
The idea is that "Additive" methods can create things very different than subtractive methods. Don't try to emulate the subtractive methods through additive means.
But for cheap prototyping, CNC Mill + Copper Boards is fast enough, and ordering a "professional" board in the USA or from China is cheap and easy enough as it is.