A TPU straw cover designed to fit the 10.5mm diameter silicone straw on the 40oz Hydroflask cup. The model is parametric so it could easily be resized to fit any straw. Here are the adjustable parameters and the default values:

Mine was printed out of SainSmart teal TPU at 0.2mm layer height and 15% infill. No supports are needed.
The author marked this model as their own original creation.