One of the best functions of a 3d printer is for creating a solution for a problem. Need a specialty tool, design it and print it. Need a part for a project but shipping takes a couple days, print it. The other day my toilet was rocking at home, instead of running to the store for wedges to balance it, I printed out a half dozen in 20 minutes. It's merely a tool, and yes, the more expensive models are easier to use, but the cheap models give you experience as to how they function and how to fix them. If all you ever used was a plug and play model, downtime could be a lot longer when something goes wrong. Take a look on youtube. There are plenty of people building 3d printers from scratch, hell i'm sitting on enough parts to build one from scratch. But as mentioned earlier Prusa is a fine machine that everyone seems to copy. The only trap to having a tool like a 3d printer is putting your self in a mental box as to how it helps your business. See it as part of the solution, not the entire solution. Companies that do cast parts use them to build sacrificial blanks for metal parts. The dental industry use them to create models from molds for false teeth. A buddy of mine makes grips for hand guns first out of plastic to get the right feel before production.