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This is the ball that fell out!
A 6mm ball to go with my pendants that 'can-take-a-ball'
My 3 strand mobius pendant has now become unprintable due to the nature of its construction conflicting with the methods employed (imo)... so now both pendant and ball are available as seperated models which can be fitted together (see video)
The pendant is here http://www.shapeways.com/model/161325/