The invention relates to a printing unit comprising a first printing roller (12) with a first shaft (14), a second printing roller (18) with a second shaft (20), a first mandrel (24) configured to hold each of the shafts (14, 20), a second mandrel (26) configured to hold each of the shafts (14, 20), and a carousel gripper (40), a carousel gripper (40) configured to move in translation in a printing position in an axial direction of the first and second printing rollers (12, 18) to pull the first shaft (14) out of the first mandrel (24) and pull the second shaft (20) out of the second mandrel (26); rotating about an axis parallel to the axes of the first and second printing rollers (12, 18) so as to change the position of the printing rollers (12, 18); and translatably moving in the axial direction of the first and second printing rollers (12, 18) to insert the first shaft (14) to the second mandrel (26) and the second shaft (20) to the first mandrel (24). The invention further relates to a method for changing printing rollers (12, 18) in a printing unit (10).