A machine whose primary function is additive manufacturing by cement or concrete deposit — building structures layer by layer from a digital model — is classified under 8485.30 (8485300000) as an additive manufacturing machine, not as general construction equipment. The additive, computer-controlled, layer-by-layer deposition process is the defining characteristic that places it in heading 8485 rather than in the construction machinery provisions of Chapter 84.

Heading 8485.30 covers machines that build ceramic articles by depositing material layer by layer in an additive process. Kilns and furnaces, which fire or sinter already-formed ceramic bodies, are classified under separate headings for industrial furnaces and ovens. The classification distinction rests on whether the machine's primary function is the additive construction of a part versus the thermal treatment of a pre-formed article.