This is for potentiometers with 6mm flatted shafts.
Print dimensions are 13mm wide by 11mm tall, and shaft hole is 6.45mm wide. It's a good, snug fit at .15mm layer height.
To get multiple colors like the model and photo, add color change gcode at the appropriate places. For me that was 10.4mm (right when the position marker emerges) and 9.65 (an equal distance below the previous change). It will otherwise print just fine with only one color.