I used to sell these ready-made cutters, but I don't do that anymore, so why not share the files here! It makes it easier for you to create your own cutters and clay earrings, or anything else you can imagine. They're also great for Play-Doh - my kids can attest to that!
The blade is sharp, and the grip is thick, which prevents fingers from coming into contact with the clay.
The 3MF file presets the best settings I found for my Bambu printer.

No support is needed.
A two-story wall
The filling rate doesn't matter much because the wall is very thin.
You need an ARACHNE wall to print correctly.
Slow down your first layer printing speed to achieve good adhesion, especially for patterns with complex designs.