More export options

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Whichever export options we don't end up implementing for #13 lets consider adding them to the app!

Also to possible include:

• .blend (blender)
• Web based three.js viewer w/ cheesy sci-film overlay graphics?
• Prepare for 3d printing (I actually think it would be better / easier to just import the model into any of the preexisting 3d printing software which is designed to solve this exact problem...)