This is a rubber can cover to keep bugs out of your soda or beer can. It is for a can with a 54.1mm wide lip which seem to be the most common now. It should fit snug on the top of the can.
It should be printed with TPU or something similar since it stretches just a bit to form a snug seal.
I provided the CAD model files for Fusion 360 and Solidworks if you want to customize the size.
Printer: Ender 3 Pro w/ direct drive
Material: TPU or similar flexible material
Rafts: No
Supports: No
Resolution: 0.15-0.2mm
Infill: 25% or higher
Shells: 2+
Note: Print flat on the print surface.
The author hasn't provided the model origin yet.