On AndysMachines, Andy creates an amazing Terminator skull starting off by fabricating most of the parts using lost PLA casting. This is when you 3D print models of parts, create a mold around them, and then heat up the mold to melt away the PLA plastic inside so that it’s ready for a metal pour (in this cast aluminum).
As Andy points out, it’s not a tremendously precise process and there was a lot of post-processing, but it definitely saves time over having to hammer sheet stock and machine all of the skull pieces.
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