Customizable Bubbler airlock

This is a simple "bubbler" style dual-chamber airlock for home brewing.

Note: still having trouble with getting prints to reliably hold liquid. I'm pretty sure it'll work if I print in PETG, but with PLA it's giving me trouble.

Update 2017-09-10: a new cider season is here so I've had a chance to do more testing and tweaking. Adjusted the model a bit for a "flatter" shape and tested with PETG. So far, natural PETG with 5 perimeters and 6 top layers at 50% infill seems to be holding up to primary fermentation pressures. YMMV.