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Requirements for 3D printed mold? Answered

Are there suggested requirements for a 3D printed mold? E.g.,
- PLA be or ABS?
- filament density settings?
- will the printed mold surface be too rough for cast to look smooth?
- does the inside need to be covered with some substance to avoid glueing of model to the cast?

If this is outside the scope of this class can you please recommend a source of reference!

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