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flexinol nitinol muscle fiber

flexinol/nitinol/muscle fiber

I am interested in designing some add on components for my robot using memory alloy wire.

I've never used it before, and thought I'd ask for general advice/pitfalls before I order.

I am planning on ordering it from here

 

http://www.robotshop.com/flexinol-en.html

 

any advice on ordering and using this material?  thanks.