A hook guard that actually stays on
A soft TPU clip that snaps over treble hooks and jigs so they stop catching nets, clothing and fingers.
The problem
Loose hooks in the box are the most common source of blood and tangles on board. Rubber bands and plastic caps fall off, and the ones for sale only fit one hook size.
The fix
The guard is printed in soft TPU with an internal rib that grips the hook bend rather than resting on the points. That holds it in place without dulling the hook. The same profile scales to sizes 2, 4 and 6, colour-coded so you can see which hook is underneath.
Tested through a winter season: it does not let go in frost, and TPU stays flexible where ordinary plastic turns brittle below zero.
More ideas
A rod holder that fits your rail
A parametric holder printed for the exact tube diameter your boat has — not a standard no boat actually follows.
Gear tags for nets and pots that last
Name, phone number and registration embossed into the tag itself — not written in marker that vanishes in three weeks.
Replacement handle for a reel nobody makes parts for
A good reel becomes scrap because a 40-krone handle is out of stock. That part can be printed in carbon-filled nylon.