Weight needs to be added to the container. You can use nuts, bolts, small coins, stone, sand - anything that can weight it down. Adjust weight depending on paper.

This model is modular, you can print as many as you need and connect them.

Print Settings: 

Layer Height: 0.2mm.

Nozzle: 0.4mm.

Infill: 10%.

Perimeters: 3 Walls.

Material: PLA.

Support: Required.

Bed adhesion: No.