There are seven sizes of this fishbone stamp here, from 2cm to 4.5cm long

This set was made with the 3D Cookie Cutter app. It makes creating and printing cookie cutters a breeze.
https://apps.apple.com/ca/app/3d-cookie-cutter/id1493296732

You can find my slicer settings here https://www.facebook.com/media/set/?set=a.187781799454511&type=3