Carboy Bung for Blow Off Tube

Bung for Better Bottle style carboys(plastic carboys) that can be customized for a blow off tube rather than an airlock.

EDIT: After printing this it was not airtight using 20% fill. I suggest printing solid or else you will have to seal it with some type of sealer. I submerged mine in water based poly for 30 mins and then dried it. ABS would probably be better than PLA as you could acetone vapor it and seal it (probably).