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Blender builds its animation system on 3D models, so we use just that. Set the units, unit and grid scale to 0.001, clip end to 10000, hide light and camera, switch to modelling environment, move default cube below origin (g z -1 enter tab), set its xy size to 100, its xy scale to 50 (to approximate print size max), set dimensions on default cube, enable 3D printing add-ons.
Blender has really advanced in the past few years. They had a big injection of investor cash and the product has been on fire since! It seems there is nothing it can't do! Although focussed on sculpting and animation (thus its popularity in movie making) it nonetheless is useful for 3D modelling. People keep saying it is a jack of all trades and thus not a master of any. But the developers keep proving them wrong. Just booting this app and seeing the detail of the user interface is an incredible experience! It exists because of the incredible power of even consumer computer workstations today.
Blender is free. This is difficult to believe. Their business model is to create a free part that is at the centre of an ecosystem of add-ons that sold by thousands of companies. Fortunately, the free version is well beyond what most hobby or home users would ever need.
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