Sure, but what about other costs. You can pick up a poloroid for about $50-75 on ebay. With this one, you will need to buy things like a 3D printer (and the necessary accessories, like filament), the rasperry pi, battery pack, printer, etc. Yes, the thermal paper is cheaper over all, but the cost will be a lot more up front, even if it work out over time. Don't get me wrong, this is a cool toy, but the title is definitely a bit off.
While I did just buy a 3D printer, I want to enlighten the community: many public libraries now have maker spaces. I recommend checking those out if you want to do one off stuff
The printer is about 20 euro, raspberry pi zero is currently 10 euro, pi zero camera is 14 euro. I don't know how much 3d printing services cost, since i have my own printer. Powerbank depends on which powerbank you choose. Cost difference is probably less than you'd expect