Lab on a chip doesn't really mean much. From an efficiency and preparitive scale(which a dosage of a drug must be) they don't always compare. A whole new process would need to be developed to make a target, and each target requiring different specific reactors(making these isn't exactly like putting legos together even if a 3-D printer makes it for you). If you want a mg of a compound with a few simple reactions and have $50,000 for the equipment that goes with the micro-reactor sure it's a nice tool. Pharmacuetical industries do use techniques similar to this.
Probably the cheapest and simplest micro reactor equipment(new) runs about $25,000 currently
More adequately one should be ready to fork over $100,000 to $150,000
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That's the detail people leave out when they show you a lab on a chip...Now I know 3-D printers are high-tech and great but I don't see them replacing these just yet... At least not cheaply.
Graphene objects sound possible, I wouldn't reject that.
Let's talk ibuprofen...
The original industrial synthesis(the cheapest way possible at its time) was done and patented by 'boots'
Could this be done via maybe 7-8 micro-reactors(if the silicone material could even handle the reagents involved...)? There are advantages in some cases to batch scale microscale reactors sure, but how that is incorporated with a 3-D printer? Maybe a little evidence would help. The most note-able thing I have seen was a knoevengal condensation reaction on an analysis scale(lab on a chip techniques), then again I'd seen a similar reaction done by grinding lithium hydroxide with the solid materials using a mortar and pestle on a significantly larger scale with better yields and faster reaction times at room temperature without solvent...
Now lets go to the modern synthesis that replaced the original because it has 77%-99% atom efficiency almost waste nuetral. Aka, as I said above reduced 10's of thousands of Metric Tons of waste the original synthesis made(Boots).
Oops it uses HF, bye bye 3-D printer probe, reaction chamber, you get the picture... Then a hydrogenation, wow can't imagine that being done on a lab on a chip, and if they put the catalyst in the walls of the micro-reactor(as they say is an advantage...) it couldn't be regenerated by any casual means(expensive waste and now the reactor needs to be replaced frequently...). Oh crap then a palladium catalyzed reaction requiring carbon dioxide gas(pretty certain this is done at a high temperature but I am speculating). Well it's intuitively obvious a micro-reactor is not ideal for such a process, or the boots method.
I don't think it's organic chemists are stuck in the past, I'm pretty sure they use flasks for a reason. Would you rather maintain 5 micro reactor processes to run a reaction in parallel($1,000,000 in equipment alone), or have 5 flasks and glass-ware for about hmm $500? Now to expect a 3-D printer to operate on this scale well, it again is an outlandish claim. Where's the evidence?
Again analysis is needed for drugs because one malfunction in the process and well you don't have what you want at all. Like I said before tack on another exorberant amount of money for that equipment. Stream line all of this equipment to work on it's own so that a lay-men can print this out(now the equipment would likely take up the size of a bed-room) using soft-ware and data acquisition techniques that currently do not exist. As there are thousands of people whose job it is to monitor industrial or research and development processes after-all you know what say an analytical chemist, environmental chemist, industrial chemist, etc do...
How regulated are things like tylenol after-all? Ridiculously regulated. The whole FDA and legal system would have to change. Drug patents would need to be changed, etc. Societal issues would be at the very least, massive...
It's just not there yet, and it certainly won't fit on a desk, nor be with-in any normal persons budget, and the government wouldn't support it(likely). It won't be for a long time either, even with moore's law.
