Here's the video of the lecture about Molding and Casting from Opendot/WeMake in Milan. It is based on the Digital Fabrication Studio course I've been lecturing at Aalto University - School of Art, Design and Architecture - Department of Media - Media Lab Helsinki.
One of the students at Opendot, Saverio Silli, has a lot of experience in molding and casting, so he gave a short lecture (in Italian):