Nalgene Water Bottle Funnel
prusaprinters
As the title implies, this is a funnel meant to help get powders or other things into Nalgene water bottlesI used PETG+ to have a bit more flex, but PLA might work too. Fits just snug enough to make a nice friction seal (see pic where I'm holding in the air)Use with liquids at your own risk, but should be safe if using to funnel protein or fiber powders :)
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