A simple adapter to fit a standard sized Hydroflask in the Tesla Model 3 cupholder. A clearance cut ensures it won't interfere with the other cupholder. The base is hollow allowing for extra storage while reducing material usage. Edges are contoured for easy use. Friction fit.
No supports needed. Print as-is (should be upright as it will sit in the car). Test prints in PETG and PLA with 15% gyroid infill are plenty durable after 3+ months of regular use.
The author hasn't provided the model origin yet.