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Hi, thanks for a great instructable. I bought some nitinol wire from KRL and formed it into a spring by wrapping it on a rod and heating it to fix the shape, it works but the pulling force is not the 2lb that is listed on http://www.dynalloy.com/tech_data_wire.php. Does the spring form have a reduced pulling force compared to linear movement? How did you create your springs? The websites you listed do not sell springs at the 0.2 and 0.5mm sizes you used. Thanks.
Caress the Gaze: 3D Printed Structures Using SMA Actuators