by amok, published
Inspired by emmett's Stretchy Bracelet (http://www.thingiverse.com/thing:13505).
I'm thinking of having it shapewayed and will update.
Stretchlet_20130101_01_stl.stl a "solid" file, inner radius about 2.75 cm.
Stretchlet_20130101_01_3.75_shell_low_poly.stl is only the outer shell, inner radius about 3.75 cm.
Printed by Andrew on his rep-rap, using just the outer shell file. Very flexible in ABS.