Bump Key Hammer
thingiverse
Use this to tap your bump keys. Designed off center to be better-suited for a right-handed person. I included the sketchup file if any lefties want to modify the design. Instructions So the .stl file is teeny tiny. I printed the one pictured at 9x size and it is perfect. Also, make sure to use 100% infill so that the hammer is heavier.
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