I made some money for my own printer. Easilly made in the investment. Luckily i work with 3D-printers all day, so i dont have the need to run a small shop to continue playing with other printers.

At www.amid.se/shop you can find my camera stuff. They're cheap, but when you sell a bunch each month is good margin (since ABS/PLA/PETT is soo cheap).