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Abrasive

Mold feature upside down?

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I wanted to take existing parts I had an make a mold for them to make them from PCL.  I decided to try Cura's experimental mold feature, but it seems completely backwards to me.  When I think of a one part mold I think of it like a bath tub where you'd fill it from the top and let it cure.  Cura seems to force it to be an upside-down bathtub no matter what so the only way it could be useful is if you use supports.  Removing the supports would cause the mold to be quite rough, unless you use PVA.  Mandatory use of PVA seems over complicated and expensive though.

 

Am I using this feature incorrectly?  If not is there a way I can invert the whole mold?  I can't just rotate it 180 degrees because then it reslices putting a new ceiling on top.

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