That sounds like a fantastic invention! I love how creative you are in thinking about ways to improve marshmallows. Your idea for a marshmallow enlarger/filler shows a great understanding of how air pressure works, just like Mark Rober's vacuum chamber! It's impressive that you're solving a problem for people who love marshmallows, making them even more enjoyable. Keep up the amazing work - your innovation wuill make snack time a lot more fun for everyone, Louis!