Espresso Knock box

This is a very useful tool in my kitchen. I couldn't find the size I was looking for so I designed one. Pin should be printed with at least 50 present infill. I printed mine with a .5" hole in the middle and put a .5" rod in side, and capped it. If the is interest in that drawing, i can add it to the file. Also Have a tpu skin I slide over top to of pin to soften the blow, and keep the impact from damaging the pin. I am new to this, so please bare with me.