Lid for PET bottle with hose barbs
thingiverse
This lid suits standard PET bottles, typically used for soft drinks, and features hose barbs with a watertight seal without extra O-rings. To use, download the thread library from Thingiverse, place it alongside the cap's SCAD file, and render the part. For best OpenSCAD preview, increase the "Turn off rendering at..." setting to 5000 (found in Preferences->Advanced). Print two parts of the cap and bond them with superglue, using more than usual to seal gaps around holes. The cap is naturally watertight due to conical seals, but an optional 21mm O-ring can be added for extra isolation. For extracting water from inverted bottles, install a second hose barb for tubing and let air in via siphon creation.
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