It's not _just_ printing though it's transport, storage and distribution then at the end of it's life span collection and destruction. In 2023 the US printed 2,

It's not _just_ printing though it's transport, storage and distribution then at the end of it's life span collection and destruction. In 2023 the US printed 2,397,104,000 in $1 bills alone. Doing anything at that scale is not cheap no matter how inexpensive a single unit of production is.