![]() ![]() ![]() Now a negative lives inside this block so you will need to conveniently cut the block through your negative to create 2 mold parts. Next thing is to create a large rectangular block and subtract the positive model from the block. In order to make a mold you would have to import the STL model into a CAD program (there are a few free ones available like Fusion 360 or FreeCAD or maybe many more that will work also) and make a solid body from the surface model. You should be aware that a model in STL format is not a solid model, it is a surface model. In addition to the answer of Davo (which describes a surprising feature of the slicer software I was unaware of), a more generic description would involve the use of a 3D solid model CAD program. ![]()
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