*improved* Fermonster carboy blowoff tube adapter

thingiverse

UPDATE: I refined the design slightly, opting for a non-polygonal bottom screw so users can grasp it easily. I also advise printing with 6+ walls or heavy infill to ensure the device remains robust enough to tighten securely. Initial tests with 4 walls and 15% infill resulted in breakage during stress testing due to insufficient strength. To accommodate various tolerance levels, I've included files for both separate top and bottom pieces as well as a combined version. Users can scale up the bottom piece by 0.5-1% if their tolerances are too tight, improving thread interference. The Fermonster carboy comes equipped with a screw lid that accepts a #10 airlock bung; however, owners who prefer not to use an airlock will still need to purchase a bung for blowoff tube compatibility. This design utilizes standard silicone tubing (14mm ID), which I had on hand. This blowoff tube adapter fits the #10 hole snugly, and the nut's underside features relief for the structural ring on the hole's underside. Users will require an O-ring for the top piece's underside (lubed with Keg lube) to achieve any sort of seal. To maintain a low profile, I designed this device with a 90-degree side exit, allowing users to fit two units within their temperature chamber. The threads are tightly wound, but applying keg lube and then using expanding jaw pliers to "work" the threads alleviates resistance. After installation, users should be able to sanitize around it without needing to remove the device.