Working on a model for a large trolling lure like we use here to catch marlin, ono and mahi. Still working on the exact size and shape, but it's a good starting place. Prints as is with no supports.
Printed at .2mm using PLA and 80% infill, the lure definitely sinks. I plan to experiment to see what infill % is the minimum for sinking - then you could change the buoyancy of the lure to your liking.