Oil reservoir
thingiverse
My wife claims this design surpasses everything I've ever created. I built it with the intention of making oil draining from a bottle effortless and keeping the bottle spotless, preventing any stray oil droplets from forming around it. This ingenious design also enables you to fill the bottle easily, just like using a funnel. It was specifically crafted for bottles with an inner diameter of 23mm. The collar is flexible and has a diameter of 24.5mm, meaning it fits snugly into a 23mm opening. Feel free to scale this design up or down to suit different sizes of bottles.
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