Fishing hook disgorger. Place the line in the slot and follow the line until the head on the disgorger engages with the hook. While keeping the line tight, press the hook a little into the mouth of the fish - this will release the hook from the fish and (if the disgorger has the correct size) fix the point of the hook so it can not hook the fish again while the disgorger and hook is being remove from the fish.

You can print this in ABS, PETG, another material for outdoor use, but even in PLA it should be good for a couple of fishing seasons.

The model has been made to scaled. In the picture with the black disgorgers, the large printout is the unscaled model, while the smaller on has been scaled to 50% on the X and the Z axis. The mint colored disgorger is a 75% X/Z scaled print-out.