miniSageCAD

A tool for Constructive Solid Geometry like OpenSCAD but written in Sage http://www.sagemath.org/

An **example output** ca be found here:
https://www.thingiverse.com/thing:41272
– (a porous gyroid cylinder )

There is already quite some functionality in very little code.

You can (via the Jmole 3D viewer in sage) preview & turn the 3d output before saving to *.stl file. With Sage you have a fully blown computer algebra system CAS at hand. Transfinite unbounded objects can be used