A little story:
A long, long time ago my dad found a CAD program named "V-CAD" in a French shop for a very low price. This was a simple 2.5D CAD program that was actually pretty good, easy to learn and could print true 1:1 scale drawings on an inkjet printer. When I write "A long, long time ago" I'm talking Windows 3.1-time (1994).

This program can save files in AutoCAD DXF format, and still works on Windows XP. The company that made it (Centriforce) later went on to produce CAD/CAM-software for the professional market...
Then, later my dad went to work for an academical institution and one day came home with a copy of Rhinoceros 3D, which had been laying collecting dust on a shelf for a few years. This is a professional 3D modelling and rendering package, aimed more at producing nice images than simple mechanical design (but unlike some other packages, it can be used for both equally well), and has a fairly steep learning curve. Unlimited license. It imports AutoCAD files...

(you see where this is going, right?)
So, cheap and ancient CAD program + expensive professional dust-gathering software obtained for free? Could they talk to each other, maybe? It turned out that they could, yes (V-CAD 1.0 = Best Software Buy. EVER).

Basically I'm only missing a CAM-driver and CNC machine to make my own stuff.