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How can i cut out a pattern best on a round shell object ? 3D

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Meshmixer might work for you. You can create the primitive shape you want with a shell thickness of your choice. Then you can create a stencil to use with the surface sculpting tool. The stencil can only be black and white however. White areas in the stencil image will cause the surface to bulge out while black areas remain unaffected.

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Just to throw in an extra question, Are you asking about positive/negative space? Or are you asking for raised areas as rowiac suggested.

Most software can create a raised area as displacement map using black and white or grey scale.

Creating negative areas may be difficult. I will have to look.....I may be mixing things up (not uncommon) but I could swear I saw something in a thread about this somewhere else.

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OK...I do not think it does negative spaces where you can 'knock out' material, but here is something you can get for free. I have not tried it, but it does look cool.

https://github.com/MarkWheadon/velocity-painting/wiki

And, just search velocity printing or velocity printing.

The name to keep correct is Mark Wheadon.

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