The invention is a stereolithography machine (1) comprising: a container (2) for a fluid substance (15); a source (3) of predefined radiation (3a) suited to solidify the fluid substance (15); an optical unit (4) suited to direct the radiation (3a) towards a reference surface (5) in the fluid substance (15); a logic control unit (6) configured so as to control the optical unit (4) and/or the source (3) so as to expose a predefined portion of the reference surface (5). The optical unit (4) comprises two micro-opto-electro-mechanical systems (MOEMS) (7, 8) arranged in series, each one of which is provided with a mirror (9) associated with actuator means (12) suited to set it rotating around a rotation axis (X1, Y1), said two micro-opto-electro-mechanical systems (MOEMS) (7, 8) being arranged in such a way as to allow the radiation (3a) to be directed towards each point of the reference surface (5) through a corresponding combination of the rotations of the respective mirrors (9) around the two axes (X1, Y1).