I purchased a new water bottle during my last trip to universal, but it did not come with a rubber sleeve at the bottom. I have older bottles that have them and I like that they don't dent as easy, or don't clang off of everything they hit. This is just a simple, low-profile sleeve, as I wanted to make sure it did not cover up any of the artwork. 

The sleeve has a 75mm inner diameter, and wall thickness of 1.5mm. The thickness at the base is 2mm, but I am tempted to add some more thickness and round off the corners more. 

I printed this at 100% infill in Overture TPU. If I do add some thickness to the bottom, i may change the infill to allow for more cushion.