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[Video] Large Scale Mold Making - Making the Negative "Tool"

Step 12Trimming and Sanding

Trimming and Sanding
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With the plug supported above the stand - mark a line on the flange three inches away from the plug all the way around the plug.

Then, take a jigsaw and cut along this line. Use a fine blade -- one for metal works well. A wood blade is not suitable and will chip bits off the flange (the polyester resin makes a stiff structure at the cost of it being more brittle).

Sand away any burrs on the entire plug and on the flange edge.
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Author:trebuchet03
I'm an Engineer in San Francisco. Mass producer. Former Intern. Rapid Prototyper. Sometimes, I post Instructables. My Favorite number: 42 By profession - I am an energy engineer. I count electrons p...
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