Movable side wall group for a ceramic product press, said movable side wall group comprising one frame at least one side wall operatively connected to the frame, delimiting at least one retaining surface for a material to be pressed; means for guiding of the frame along a first direction, first actuation means for moving the frame and said at least one side wall along said first direction, second actuation means associated to said at least one side wall for the movement of said side wall along a second direction perpendicular to said first direction and substantially horizontal, said second actuation means being designed for collecting the material to be pressed which could fall on the surface on which the material is placed, thus way avoiding the production of scrap or waste of said material, wherein said second actuation means comprise at least first drive means connected, through transmission means, to said at least one side wall, wherein said transmission means comprise at least one first movable element connected to said first drive means and at least one second movable element or driven element connected to said at least one side wall, said at least one first movable element and at least one second movable element or driven element being operatively connected to each other, so that the set in motion of said first movable element causes the movement of said second movable element along said second direction, away from said first movable element, characterized in that said first movable element and said second movable element each comprise a plurality of respective shaped portions reciprocally engageable by shape engagement. one frame at least one side wall operatively connected to the frame, delimiting at least one retaining surface for a material to be pressed; means for guiding of the frame along a first direction, first actuation means for moving the frame and said at least one side wall along said first direction, second actuation means associated to said at least one side wall for the movement of said side wall along a second direction perpendicular to said first direction and substantially horizontal, said second actuation means being designed for collecting the material to be pressed which could fall on the surface on which the material is placed, thus way avoiding the production of scrap or waste of said material, wherein said second actuation means comprise at least first drive means connected, through transmission means, to said at least one side wall, wherein said transmission means comprise at least one first movable element connected to said first drive means and at least one second movable element or driven element connected to said at least one side wall, said at least one first movable element and at least one second movable element or driven element being operatively connected to each other, so that the set in motion of said first movable element causes the movement of said second movable element along said second direction, away from said first movable element, characterized in that said first movable element and said second movable element each comprise a plurality of respective shaped portions reciprocally engageable by shape engagement.