Moisture and dust caps/plugs for MC4 solar panel connectors.
Flyscreen for your yacht's portlights. Keeps bugs out, reduces the amount of rainwater that gets in, increases privacy.
Simple 3D-printable fishing float.
Aligner for orbital sander pads (125/150mm). Helps change discs quickly and match holes nearly perfect for best airflow.
Wrenches of various types to unscrew and tighten housings for water filters.
Kayak/tender paddle blade that creates extra resistance and drag on both sides for increased performance.
Aglets for ropes (docking lines, sheets, running rigging). Prevents chafe, eliminates loose ends, looks neat.
Prevents dock lines and rodes from drowning completely if they fall into the water.
United States Coast Guard (USCG) registration number placard for federally-documented vessels.