A soft blow face for the hammer I like to use for working on 3D printing projects. its a car emergency hammer I got for $2 on ebay, but I like how precise it is as a small hammer. I use it for setting parts in a vice and for getting tight parts together, amongst other things.
More details in this video: https://youtu.be/ybv5jW0TomY
The hammer is linked under the video, idk how thingiverse feels about ebay links.