This is a simple but useful print to add a “soft head” to a small hammer (often sold as a “Watchmaker's Hammer with Six heads” - see photos).
The hammer head is printed in TPU and simply screws on - no threading required.
Note : I often find this type of small hammer useful for tapping in plastic pegs, and other operations where 3D printed parts need a little gentle persuasion to fit together.
Print in TPU using the 3mf file provided; otherwise :
The OnShape 3D CAD files for this are here :
The author marked this model as their own original creation.