Modelling the Solar System with OnShape

I really liked the [original model](http://www.thingiverse.com/thing:1430614/#comments), but was frustrated with original resolution. Though tc-fea did increase the resolution, I still thought it would be interesting to model this up. [mom0sarah's project](http://www.thingiverse.com/thing:1736703) inspired me to get the job done, and perhaps provide an initial parametric model to anyone wanting to tackle the project.

I used the referenced [NASA doc](https://solarsystem.nasa.gov/docs/modelingsolarsystem_20070112.pdf) for planetary dimensions, and took Saturn's ring dimensions from [Wikipedia](https://en.wikipedia.org/wiki/Rings_of_Saturn). However, as the rings are a mere kilometer thick at most, they simply won't appear after slicing if we leave it there. As a result, the rings are modeled as 6,000km wide so we can see them in the final model !

The first model demonstrates relative sizes. The toughest part was probably creating a model where the planets sat at roughly equal dista