The possibilities for a 3D printer are as broad as your imagination - you can print personalized ornaments, toys, trinkets, repair parts for other devices, and even a 3D Printer to expand your capabilities (OK, really just most of a 3D printer, as you'll need to provide the electronic components).
To get a look at the sorts of items that can be printed, check out a website such as Thingiverse to get some ideas - or you can use a CAD program to design your projects as well.
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