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By hand making of the double cap
After 3D modeling, we try to make a double cap by hand.
We started from the vial caps with a hole covered by a silicon septum. We cut a gasket in the septum, by removing its center. It is the basis for our connector, cut from a plastic tube. We took two caps to make the double cap.
Then we assembled the four pieces : the connector in the gasket, that we put between the two caps. We glued with neoprene glue to maintain them together. Neoprene glue is maybe not very optimal for this piece, it is well hermetic but it dries too slowly and stays elastic.
We could thus test it! There was a bit of leak, because the connector perforated the aluminum seal too early. To prevent this problem, we had to cut again the connector so that we first start to screw before the seal is perforated. It worked better like that.
This model was entirely make with recycled material (tube, silicon septum) and the kit cost just the price of the two vials : 2x 0.27CHF = 0.54CHF.