I've already attached a dremel to the Anet A8 3D printer. In addition to a 3D printer, it can be useful to use a CNC machine or a laser cutter.
And after a few improvements, this printer gives a nice result. In a previous instructable I've assembled and improved an Anet A8 3D printer. The big advantage is that you can design and make your own 3D objects. Most of my DIY projects make use of a 3D printer.