Foam rubber is a fun and useful material. Having a foam rubber machine would be a great asset for HAL9K. It is a project in its own right, but can also be used for future projects.
Requisites
We will aim to use as few hazardous chemicals as possible, so instead of foaming agents we will use vacuum. Thus, we must either construct or aquire a vacuum pump.
The material needs to be both frozen and heated, so we must bash both an oven and a freezer.
The timings for moulding should be automatically controlled by a microcontroller.
Chemical expertise is needed for constructing the recipies.