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Old 03-20-15, 09:19 AM   #3
Master EcoRenovator
Join Date: Mar 2009
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My bath sink has the standard drain stopper that relies on friction to keep it up or down.

The most common use of Nitinol that I've seen is heat activated springs, when the water water turns it into a spring it can still be moved, but it would be a self closing drain, when the water was cold the spring would bend like a wire twist tie.

For a kitchen sink it might be more complicated, but I think most of the common drain stoppers could be retrofitted.

I'm not sure if any 3d printed parts would need to be made as I think simple bent wire springs could work.
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