This is a spinning wheel bobbin for Louet scotch tension wheels - the Victoria (S95/S96), the Julia (S11) and the S10 Concept (S10C). Shown on a Victoria.
Bobbin ends and core are printed separately. The bobbin ends do need support, the core does not. I printed mine all together with 25% infill for everything. The core will be a pretty tight fit into the bobbin ends, but you should glue it in place to ensure it doesn't move while spinning.
Galaxy Glitter Sparkling Chameleon Rainbow