Water Bath Weight for Two Hose Connector Bottle Top
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Normal bottleweights don't fit this special lid so I designed this for metalcasting or printing in copperfill.
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I use special bottle lids to replace air with nitrogen in culture media storage bottles. When their liquid volume is low they have a tendency to float-up in the water bath and fall over, requiring the remaining media to be thrown out..
They sell plasti-coated metal bottle weights to solve this issue, but the normal ring-shaped weights don't fit these special lids.
I designed this custom bottle weight to sandcast my own bottle-weights in bronze (90% copper 10% tin). Weighs around 115g, which is more than enough for the 250mL bottles I use.
Printing with 100% infill from a heavy filament like Colorfabb copperfill is an option that doesn't require a metalcasting setup.
Note: Model for the shown barbed fitting caps is available here.