Oh yes, almost nothing I print is “necessary” but I love problem solving with printing. Can you link the accordion holder. Having trouble visualizing it.

Yes the big STL is only the top shelf. I love those locking lid containers, I end up using those instead of ziplock bags because they are so nice.

I used Polymaker white PLA and with cutting off the bottom, it’s all solid inside since it’s all so thin, so infill doesn’t matter. No supports.