Wall Mountable Stackable Storage

Theirs quite allot of storage around but I designed these around my specific needs for stackable storage. I wanted something sturdy, to maximise internal storage space but be efficient on filament quantity and print time. What sets this design apart is where I needed the flexiblity to stack and/or easily attach and remove from the wall. I considered hex, but in my case simply sliding on and off more traditional screws works better for my specific usecase. I use three sizes which I'll simply