A cartridge (1) for a stereolithography machine, comprising: a container (2) provided with an access opening (3) and with a transparent bottom (4) opposite the access opening (3); a reservoir (5) suited to contain a liquid or pasty base material, unremovably associated with the container (2); valve means (6) suited to allow the passage of the base material from the reservoir (5) to the container (2), configured to open when the difference between the pressure present in the reservoir (5) and the pressure present in the container (2) is at least equal to a predefined value and to close spontaneously when the pressure difference is lower than the predefined value, the reservoir (5) comprising tight connection means (7) for connection to an external air feeding device (8).