The Square model trimmer is a machine to trim gypsum models with a very silent and powerful electric motor, provided with electric protection and requiring no maintenance. The wet model trimmer (Square h) is provided with a cleaning system for the disc with water and continuously operational cooling system with solenoid valve and tap to adjust the flow. Special gaskets and sealing rings have been designed to prevent water infiltration in the motor compartment. To replace the abrasive disc it is necessary to remove the fixing screws from the cap with a 5 hexagon wrench and remove the fixing screws with a 13-wrench. The dry model trimmer (Square a) makes it possible to carry out dry trimming operations with an abrasive paper or diamond disc without changing the dimensions of the model and without having to wait for it to dry. In this case the powders are aspirated by a high-power aspirator with micro filters. In both models it is possible to change the inclination of the work level.