The author remixed this model.
It is based on the Hedo3D's europlugadapter_v2_hedo.stl
model. Compared to the original model I added holes for the ground pin, so now the adapter (like the CEE 7/7 plug) is usable for both French sockets (type E) and German Schuko sockets (type F). So this modification allows to use this adapter also in France, Belgium, Czech Republic, Slovakia and Poland.