Because of 3D printers increased complexity does not necessarily lead to increased cost

partial quote from:

And now, the hopping robot

This new design demonstrates the potential of 3-D printing in soft robotics. Traditional methods of fabrication — custom molds and multistep assembly — are costly and slow. The ever-increasing variety of materials compatible with 3-D printers is allowing engineers to prototype new designs faster. Increased complexity does not necessarily lead to increased cost.
“Soft robotics is a relativity nascent subfield, and 3-D printing is adding to the repertoire of things we can do in a really practical way,” said Wood.