12 links chain

Customized version of http://www.thingiverse.com/thing:28405

Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=28405

Instructions

Using the following options:

links = 12

r0 = 20

t = 3.5

d = 12

l = 22

type = spiral

pitch = 12