Putting my finger on each side was how I figured out that only one side working. On both, putting finger over left hole gave me nothing out of right side. Covering both and I have no leakage. Putting over right side I get tone from the left. 89db on my sound meter. I use a M3D printer, so not really sure what all the settings compare to other slicers, but printer was set to Print Quality high (slow) and Fill Density full (Slowest). Was set to no supports, no model support, wave bonding on, and I used a raft.