It's not quite the same niche and it costs $1K, but Rhino might do what you want, you will own it, it has a great user community and is very responsive to its u

It's not quite the same niche and it costs $1K, but Rhino might do what you want, you will own it, it has a great user community and is very responsive to its users. For making things to 3D print it should be great.