Hydroflask bottom bumper
thingiverse
I designed these for my 16oz travel coffee mug: https://www.rei.com/product/892185/hydro-flask-coffee-flask-16-fl-oz it will fit anything with the same diameter, which Hydroflask lists as 2.9in These MUST be printed in a flexible material because they're designed to be TIGHT! The v3 in particular is really tight due to the extra surface area. Enjoy!
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