A guide module for making a movement plane, comprising: - a rotation unit rotatable about a longitudinal axis; - a ball mounted on the rotation unit by means of a respective actuation pin in a rotatable fashion relative to the rotation unit about a transversal axis, perpendicular to the longitudinal axis, the transversal axis being fixed relative to the rotation unit, wherein the rotation unit has a tubular shape, extending around the longitudinal axis and defining an inner space in which are at least partly housed the ball and the respective actuation pin; - a first actuator acting on the rotation unit to move the rotation unit in an adjustable fashion about the longitudinal axis; - a second actuator acting on the actuation pin of the ball for moving the ball about the transversal axis; and - a transmission unit rotatable about the longitudinal axis and having, at a relative first end, a first ring gear meshing with a transmission pinion rotationally integral with the actuation pin, the second actuator acting on the transmission unit for rotating the first ring gear about the longitudinal axis, the transmission unit also comprising at or close to a relative second end opposite the first, a second ring gear meshing with an actuation pinion on which the second actuator acts; characterized in that the second ring gear is defined by a row of radial teeth facing towards the longitudinal axis; wherein the rotation unit has, in a relative portion opposite or distal from the actuation pin of the ball, a respective row of guide teeth meshing with a shaft of the first actuator and defined by radial teeth facing towards the longitudinal axis; and wherein the first and second actuators (52, 54) are mounted in side-byside configuration and aligned along the longitudinal axis, each of the first and second actuators (52, 54) comprising a respective actuation pinion (53, 55) rotatable about a parallel axis and offset relative to the longitudinal axis. - a rotation unit rotatable about a longitudinal axis; - a ball mounted on the rotation unit by means of a respective actuation pin in a rotatable fashion relative to the rotation unit about a transversal axis, perpendicular to the longitudinal axis, the transversal axis being fixed relative to the rotation unit, wherein the rotation unit has a tubular shape, extending around the longitudinal axis and defining an inner space in which are at least partly housed the ball and the respective actuation pin; - a first actuator acting on the rotation unit to move the rotation unit in an adjustable fashion about the longitudinal axis; - a second actuator acting on the actuation pin of the ball for moving the ball about the transversal axis; and - a transmission unit rotatable about the longitudinal axis and having, at a relative first end, a first ring gear meshing with a transmission pinion rotationally integral with the actuation pin, the second actuator acting on the transmission unit for rotating the first ring gear about the longitudinal axis, the transmission unit also comprising at or close to a relative second end opposite the first, a second ring gear meshing with an actuation pinion on which the second actuator acts; characterized in that the second ring gear is defined by a row of radial teeth facing towards the longitudinal axis; wherein the rotation unit has, in a relative portion opposite or distal from the actuation pin of the ball, a respective row of guide teeth meshing with a shaft of the first actuator and defined by radial teeth facing towards the longitudinal axis; and wherein the first and second actuators (52, 54) are mounted in side-byside configuration and aligned along the longitudinal axis, each of the first and second actuators (52, 54) comprising a respective actuation pinion (53, 55) rotatable about a parallel axis and offset relative to the longitudinal axis.