hi there. I'm new to 3D printing and loving it! I've been using 123D Design , Simplify3D and printing on a QidiTech I. results are very impressive.

The problems are with 123D Design. I'm having frequent crashes when working with sketches prior to extrusion, grouping doesn't seem to make a difference when subtracting, and anything with a sphere cut in half dimensions to the complete sphere.

some of this seems trivial, unfortunately for what I'm trying to prototype the combination of hassles is adding up.

is there a more reliable alternative that runs on the Mac that doesn't cost a bundle? I have windows installed, just prefer to stay in the OSx environment.

thanks!