#HTE
How to Make a Two-Part Silicone Mold
Could you figure out how to make a two-part silicone mold yourself? Probably. But you’d be far better served to watch veteran industrial designer Eric Strebel show you how to do it. With decades of experience, Strebel’s figured out the tips and tricks for doing it smoothly and professionally.
You’ll find the part about the sprues particularly helpful:
https://www.core77.com/posts/101124/How-to-Make-a-Two-Part-Silicone-Mold