A bin that attaches to drum thrones, for the drummer to store a wallet, phone, IEM receiver, whatever. I abhor placing these things on the ground when I play gigs; bar floors are seldom the cleanest places! You can buy commercial units like PackMate, but this is why we have 3D printers!

The design as shared has mounting holes that align with the backrest holes on a Roc-n-Soc throne. I do not have a backrest, so I was unable to test installation with both bin and backrest. No idea if it clears the backrest or not. But hey, if you go that way you can tweak the model however you like!

Yes, the installation photo only shows one bolt - that's all I could find at short notice. Two bolts are recommended.