A digital printer machine for ceramic products, including at least one conveyor, suitable for transporting the products to be printed along a feed direction, and at least one printing module, positioned along said conveyor and comprising an operating unit with respective print heads provided with nozzles for dispensing at least one printing fluid to be deposited on the surface of the products. The printing module includes a basement provided with a recess (R), underlying the operating unit, wherein the conveyor is inserted to make the products pass under the heads; the basement further comprises two completely flat and free lateral opposite flanks, so that the printing module can be matched to other modules along the conveyor until a complete mutual matching is obtained.