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How to cast a useful machinist hammer from scrap brass. In this video I demonstrate how I used 3D printed patterns with removable pieces to cast some personalised parts. I also show my method for making epoxy resin and sand cores using 3D printed core boxes with built in flexures which makes it easier to remove the cores. I will 'fess up now.... mistakes were made but I make some attempt to show where I could have done better.