Anyone know how to make a Potato Cube in Sputtium Inc 2

I need to make 3 of them to get to level 5...

 

[Sputt]

Obtain a potato compressor by combining a plastic sheet and a potato (the recipe is on a sign behind the rocket in space)
This lets you compress 10 potatoes to make a potato cube

 

[realRoforbYT]

Thanks!