It would probably work as a service company -- much like a copy shop. Customers would have to pay quite a premium, but for users who only need the tool occasionally, it would be a big savings compared with owning a 3D printer.
I saw a few 25 cent printers on there too. That is way cheap... I will have to see what kind of quality you get. I am sure the printer owners are not as professional, fast, or patient as a company that specializes in the process.
I once made a part for a company on my CNC mill. During the fabrication, I broke my mill. I went outside the cut area and damaged the servo drivers and fused a motor coil. Did they fix it? No... it was my fault.
I am sure 3D printer owners will not want to deal with mistakes and repair for 25 cents per CC. I wouldn't.
Cabe, Nadine & Pubudu -- sorry for the late comment; had a busy week – but had to "chime-in", again after reading this threads. Pubudu seems certain of the benefit of social printers, but I think his opinion would change if he had the experience described by Cabe.
3D printers are just like anything else from Cars to Weed-whackers. They can be designed for heavy repetitive commercial use, or less expensive for occasional use. If you are running a design business and own one, it might seem lucrative to rent-out time on the machine; but you are the owner, manager, maintenance technician, and funding source for the device, and that takes hours away from your billable hours. Unless you specifically design your business model to allow for normal and expected maintenance, it's a losing proposition for you. But great for the borrowing neighbors, of course.
Fifty-six-year-old Pasquale Russo has been doing metalwork for more than 30 years in a tiny southern Italy village. Many craftsmen like him brought with them fabrication skills when they came from the Old World to America.
Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.