I had a need for a soft hammer when making some parts fit tight together, and then I made this little hammer/mallet with a hammer head made of TPU, where the one end is soft (40% infill), and the other end is a bit harder (80% infill)

I have included STL and 3MF files, with or without the H & S letters.

printed on BL X1C, with a 0.4mm nozzle, the shaft and wedge are made with PLA and the hammer head is made with TPU.

Enjoy and happy printing