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3D Printing Class
You're absolutely right! Hitting the lid with the knife can crack or dent the glass border, so pieces of glass can enter the food... Breaking the seal or loosen the lid from dried food is easily accomplished the way you explained. As an added bonus, the same method (knife between lid and glass) works for oppening beer or soda bottles without the risk of breaking something.
Very neat! No soldering... Ideal for ocassional work! Is there a way to buy these pieces already made, like a kit?