Important: Prior to printing check the kit's bag to see if it's marked as model "A" or "B". Make sure to print the correct model version! The difference between versions A and B has to do with slight variations in the glass component that the bowl fits into. These variations are slight but unfortunately great enough to necessitate have two separate models for each pipe design. The hole where this part fits has a 0.05" larger diameter in model B; this is the difference.
