Automotive modelling clay extruding machine - GIF

[Frank S]

Nice thing about clay is if you keep the moisture content correct and don't fire it in a kiln you can reuse it indefinitely I like that extrusion machine

[Moldyjim]

Nice thing about clay is if you keep the moisture content correct and don't fire it in a kiln you can reuse it indefinitely I like that extrusion machine

I would expect it to be wax or oil based plasticine clay.
If kept clean, remelting the shavings doesn't hurt the clay.
Water based clay shrinks as it loses moisture and can be inconsistent in texture.

https://en.m.wikipedia.org/wiki/Industrial_plasticine