Making molds!

[DampRobot]

Originally Posted by sanddrag

Is there an easy way to take a 3D CAD file, turn it into a 3D CAD file of the inverse of the object to make a mold, and then 3D print a mold, then pour urethane or something to cast the object from? Can you cast urethane directly in an ABS or a PLA mold?

Also, I'm lost on how to invert a CAD model to be basically a block with the negative of an object.

There's a tab in SolidWorks called Mold Tools. Start with the tool called Parting Lines, and move to the right with tools in sequence until you get your mold.