This is a fully customizable parametric treasure chest. It does not require anything like screws or other to connect the lid and it locks when closed. Edit the included spreadsheet to change the width, height, depth, walls and plank size to create a custom treasure chest. 

NOTE: some people report the lid breaking when they try to assemble the chest. This depends on the layer adhesion of the chosen filament and the wall thickness of the chest. To be save, instead of printing the lid on its side, try printing it flat on the bed. This makes the lid top surface and inside look less pretty but will make it stronger so it has less chance of breaking. 

PS: If anybody knows how to make it ‘Customizable’ in Makerworld, please leave me a note.