As far as I can tell, the Thermos FJC-1001 vacuum flask is only sold in Japan. It's too big to fit in the drink holder slot in the Model 3, so the bottom part of this model sits flush within the car's drink holder, and the upper section that begins just as the Model 3 drink holder ends, is the actual flask holder.
As with all car accessories, recommend that you print this in a material with appropriate temperature resistance.
The author marked this model as their own original creation.