I used to sell these pre-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 adhesive rings, or anything else you can imagine. They’re also perfect for Play-Doh, as my children can attest to!
The blade is sharp, and the handle is thick to keep your fingers away from the clay.
The 3MF file contains the optimal settings I found using a Bambu printer.

No supports required.
2-layer wall
The infill rate is not critical because the walls are very thin.
The ARACHNE wall is needed to print correctly.
Reduce the print speed of the first layer to achieve good adhesion, especially for patterns with complex designs.