this is on line screw in fish feeder for fishing. 
you may place it on top on your fishing line and fill it with bait.

it will attract fished around your line and hooks. 

easy to use, easy to print, no support needed.

i have added to different size of top/bottom. you can print both or 2 of one. i personally using smaller one for both top and bottom part.

have fun, happy fishing. please post a picture if you catch any while using this.