I have done it quite a lot and it is not too bad if you have the patience...but I do 3D modeling for work (sometimes) and have access to SolidWorks 2012 so my perspective is a little different.

I think it would be cool to have a super detailed model of a compact mac case, but printing one now would not be a good idea, maybe a front bezel would be fine, like making a MacTwiggy. Once someone makes a model once, if people are willing to share models, others don't have to do it again and can shop around for 3D printing houses.