It looks like both a pickaxe and a mace. But its design comes from a classical cubic sledge hammer. I added pyramids with different angles for different penetration damages for different objects. Acutest angle has more penetration damage but it is more vulnerable for itself too. Widest angle pyramid on the top side of the hammer. And it is strengthening the hammer head structure at the same time.
For lost pla casting i recommend; %10 infill ratio and black pla (colourless pla is better if you can find)
Filament Dünyası PLA