This little Mini-Monster so far in both colors have had the blue gills and crappie all over it. It's small enough to for a quick meal and heavy enough to get good distance with a cast. It sinks very slowly and with the treble hook dressed it moves though thin weeds very well.
I print with a 2 part file stopping at the point I want to drop the BB's in, but you can use the one file, pause the print, add your weight and continue that's up to you.
It has a through hole to either add your wire or line and hook if that's your preference. It has an air chamber in the top half and a belly chamber for up to 2 BB's. Depending on the amount of infill and BB's you use will determined how it sinks/floats.
I use different color PLA and a Sharpie maker to give it some life and as you can see in Pics it at-least fools the fish.
Good Luck and "GO GET SOME FISH!!!"
I go at least 4 to 5 top and bottom for durability with 2 to 3 shells. Eyes socket size I think are 8mm x8mm.