The invention relates to a device for producing three-dimensional components by a process of stereolithography. The stereolithography system consists of a receiving block (12) for receiving the linear drives (34), which can move as an intersecting arrangement in a y- and x-axis, and for receiving a construction vessel (1) having an integrated construction platform (2) that can move in a z-axis, the intersecting arrangement of the linear drives for the y-axis (3) and for the x-axis (4) being arranged in vertical direction, perpendicularly above the construction vessel (1). A laser source (6) is directed by the beam outlet perpendicularly downwards towards the construction vessel (1) filled with resin, and is secured to the linear drive for the x-axis (4) by a securing means (5); and integrated focussing optics (7) can be attached directly to the laser source (6) via a holding element (9).