I wanted to go trout fishing and needed a float which sinks so I designed this. It is also known as "Sbirolino Pose". The fishing line goes through it and it barely sinks.
Through its shape it is easy to cast and position in a current.
At the end there is a recessed M8 thread with enough space for 2 M8 nuts. These are the weights as (depending on your infill) the print along is not heavy enough.
Print it in PETG as it must endure sun and water and must be fairly strong jet not too rigid as it must flex a little in casting.