I am a volunteer at a non-profit trying to help design motorized window shades without shelling out big bucks. Doing an experiment to connect a manual roller shade to a stepper motor and control it using arduino kit. Need a 3D printed adaptor part to connect a 24mm diameter solid tube to a 3x5x7mm motor shaft. Attached is the design spec. Need a .STL or .OBJ file preferably using Blender software.