I'm looking for a voxel based 3D modeling tool with STL export function for

3D Printing
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1

I’m looking for a voxel based 3D modeling tool with STL export function for iOS devices. Any advice?
https://play.google.com/store/apps/details?id=com.fb.fumotrim.free&hl=de

2

I would think something like this would be much better, but it does not have a way to output to a rendering format that I know of.

The Cura engine shares libraries with minecraft which seems to have better functionality than this.