I opened the inside up more and the outside fatter. Also made the ridges stick up a little higher. lowered the infill which I think gives it a great sound. You can scale it down if you want it to print faster but the bigger size gives it a deep moaning sound. Hope you enjoy. Not sure who the original designer is but a few people have remixed this and the license lets me remix it and not break any rules. Thank you 

I recorded a video of it. Click here for video.