An FDM Printer that switches itself off after a printing job is finished can definitely help sustainability. As FDM Printers finish printing and remain in idle mode, it still consumes energy resources in this idle mode. If the 3D Printer can switch itself off after a printing job is finished, it will not consume energy resources anymore, and will save energy resources. If you cannot tell how saving energy resources is a part of sustainability, you can contact me.
One last word: I know how severe the misinformation on the internet is. This is why I do not want to be one of those who spread misinformation. It is also why I really recommend you to contact me through "403 3122831", "email@example.com", or my LinkedIn account, and have me starting video meetings with you, or even meeting you in person once COVID-19 is over. This way, you will: a). Get to know whether it is a real person blogging here, and b). Apply your own tools to verify how trustworthy I am during video meetings or when meeting me in person.
Mr. Wu's 3D Printer Corner