Knob with Pointer

thingiverse

A knob for a selector switch with a 6mm shaft - drill it out for 1/4" if required. Threaded for a 3 x 0.5mm set screw. You will probably have to clean the thread out with a tap. Use a 10 or 12mm long screw. Should print fine without supports. Use a high infill setting of 40-50% and 3 or 4 shells. Paint the white line with a fine brush and acrylic paint. I have included the SketchUp file.