This is pretty straightforward. It is a box that is shaped and colored like a lemon. 

Any rigid filament should work. There are no moving parts. 

The lid slides onto the box. The box has little nubs that keep the lid from coming off too easily. The lid separates from the box a bit easier from the leaf end. It will loosen up a bit over time. 

Two print profiles are included. One includes both the box and the lid, so they can be printed at the same time. This is intended for printers with larger build volumes (at least 240 mm square). For smaller printers (A1 Mini) a second print profile is included that has the box and lid on separate plates.