At the weekend I cam across Alibre 3D CAD, and more importantly Alibre Xpress which is the entirely free version!
Its a fully 3D parametric modelling system like Catia, Pro/E, SolidWorks etc.
At the moment I'm in the "honeymoon" period of a 30-day trial of the full version. After 30 days it reverts to the limited Xpress version. Still, I found it easy to use and it looks very promising for robot design.
The Xpress version is limited to 10 parts in an assembly, but that's not as bad as it sounds since you can save a sub-assembly as a part, start a new assembly and you still have 9 parts to go!
If anyone's interested, I have already modelled a Fast Components motor, Hitec Feather Rx (the old 4-channel one), and a Scorpion Mini. More parts coming soon!
http://www.alibre.com
There's also a forum at http://www.alibre.com/xpress/forum
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