This is very interesting. I'm wondering why not print the blanks with a gap at the bottom so there's room to insert a lock-pick tension wrench to apply the torq

This is very interesting. I'm wondering why not print the blanks with a gap at the bottom so there's room to insert a lock-pick tension wrench to apply the torque instead of using the keyhead. That way the torque capacity of the plastic is basically irrelevant, just print with the best quality and/or cheapest material.