Cake is when a material “sticks” together with itself, leading to large spongy regions of powder.
It is an important factor in the printing of elastomers in Multi-Jet Fusion. Cake is caused by time
at temperature of the powder that causes the surface of the powder to flow, leading to change in
rheological properties of the powder. The more time at temperature the powder is exposed to, the
harder the cake will be.
Keeping the integrity of cake to test powder properties is incredibly difficult. It is sometimes
needed to check the behavior of the white powder on online tests but requires minimal alteration
to the printed white powder behavior.
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INC, HP, "POWDER COLLECTOR FOR ELASTOMERIC MATERIALS", Technical Disclosure Commons, (October 07, 2021)