These are 3D models (Sketchup and STL) for cookie cutters used in Schaffenburg's 2018 Kids 3D printing class
Attribution-NonCommercial 4.0 International (CC BY-NC 4.0)
https://wiki.schaffenburg.org/Kinderaktion#Pl.C3.A4tzchenformen_aus_dem_3D-Drucker