It's a spinning top that kinda resembles an acorn, that's the name explained. This model is open source on tinkercad so that anyone can modify it:(https://www.tinkercad.com/things/0iTVfY2XGQa)

Upload your wacky mods of it back onto thangs or just keep them privately.

I have no recommendations as to how you should print this, but the more infill the better and due to the model not being perfect in the resolution you see here, no resin printers