Mũi đột tâm (parametric) - Center Punch (parametric)

You can use this tool handheld for soft materials, but for harder ones you can hit the pad at the end with a hammer. Since this would be printed in plastic it isn't suited for the hardest materials. 

Due to its parametric design, this tool can be used in various ways, even as a weapon. Use with precaution, please don't harm innocent people and check out your legislation should it be needed. I designed this mainly as a center punch, I deny any responsibility would you use it for anything illegal.

Would you use this for food (as a skewer for example), please coat the model with a food safe epoxy resin since 3d printing is not food safe as is, even with a food safe filament.