DIY Molding (shaping liquid or pliable material)

This topic is meant to summarize do it yourself (DIY) techniques for molding.

Please post materials and methods (with links), as well as personal feedback.

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Vacuum forming

From Wikipedia:

Vacuum forming is a simplified version of thermoforming, whereby a sheet of plastic is heated to a forming temperature, stretched onto a single-surface mold, and forced against the mold by a vacuum (suction of air)

DIY by backing or taking inspiration from this KickStarter: https://www.kickstarter.com/projects/kreation/kreation-vacuum-former-make-plastic-prototypes-and-0?ref=category

The plastic used is called thermoplastic. Examples:

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