If you're just using it for 3D printing, take a look at Cubify Design (was Alibre). It has a lot of the same features as Solidworks, like parametric solids modeling with a history tree and output as 2D drawings, but it costs a lot less. The only 3D format that the $199 version exports is STL, but that's all you need for 3D printing.

Andrew Werby
www.computersculpture.com