Which 3D software should I learn for 3D printing?

thingiverse

In our MakerSpace, I often get asked about the best software for 3D printing projects. There isn't one answer as it depends on factors like complexity and precision of designs. To help decide, check out this chart: http://www.gliffy.com/go/publish/5271448. Share your choices and experiences in the comments. For examples, a Blender-made octopus represents organic shapes while Cubify Design's "central part" showcases precise dimensions. This decision chart is based on reading, interviews, and experiences, but may not be exhaustive or objective. Please keep suggestions constructive to improve this guide.