Printed Bridge

There's also two more links about design(from Sam):http://a360.co/2GrMNuJ
http://a360.co/2IrlRfg
2inch, 1.8inch and 4.1inch are 50 percent infull. 3.605 and 2.147 inch are 70 percent infullp
The biggest weight it holds is 11.5 pounds. The ratio is 457.
We meet the problem of printer at first( my part）And then Sam used the wrong data to design(my bad, I made the design picture too complex) We finally finished the bridge at the third time. Our bridge is too weak that it could only holds about 11.5 pounds weight. Fortunately, our weight ratio is not that low because of our bridge numbers are light.