3D MODEL DESCRIPTIONA semi-circular computer mouse, with five function buttons, very comfortable, the hand rests loosely on it, and the buttons are close to the fingers.Slides easily on the surface, suitable for the Microsoft Comfort 4500 mouse, just open 3 screws at the bottom, and replace the existing cover. You need two springs of a regular writing pen, 7 screws with a diameter of 3 mm and 4 nails with a diameter of 1.5 mm and a length of 30 mm. Detailed assembly instructions, detailed printing instructions (including a screenshot of filling all CURA columns, as well as print-ready files) and all dimensions, hinges, screws and springs can be found in zipped folders below. I updated the click buttons to another type with a small socket for your finger, you can choose which type is more convenient for you,