Additive manufacturing machine having a compactly arranged actuator

A powder bed fusion additive manufacturing machine comprising:

• a work surface;
• a build sleeve extending from the work surface and below the work surface;
• and
• a build platform moving translationally between a raised position and a lowered position inside the build sleeve under the effect of an actuator,
• the build platform being connected to the actuator by a support,
• the build sleeve comprising a slot in its height allowing the support to pass through the build sleeve to connect the build platform to the actuator when the build platform translates from the raised position to the lowered position in the build sleeve,
• a closing-off element allowing a slot in the build sleeve to be closed off progressively as the build platform effects translational movement inside the build sleeve from the raised position to the lowered position,
• a closing-off element being a tape,
• wherein an upper end of the tape is fixed to an upper edge of the build sleeve or to the work surface.