Tri-Bar Water Bottle Cap Wrench
thingiverse
This thing is a re-mix of the earlier Water Bottle Cap Wrench. This one fits much tighter on the cap, and offers a lot more leverage with the tri-bar shape. Instructions Flat side down and go! Once you've made it, I've had better luck getting a good grip on the bottle cap by pressing the wrench onto the cap BEFORE putting the cap on the bottle.
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