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Simple and reliable device for plugging metal or plastic thru-hull fittings.  Can be used to ensure that no water gets inside the vessel if the work is being done on the fitting while in the water.  Another use case is for emergencies — to stop any leaks without doing work inside the vessel (e.g. replacing a valve).

Printing

Filament

Has to be flexible and salt water resistant (e.g. TPU 95A).

Settings

Random seam position, 3+ walls to keep it watertight, 15%+ infill, hexagon pattern (or similar), no supports.