All profits on sales of this model through December 31, 2015 will be donated to Enabling the Future, a wonderful organization providing free 3D printed prostheses to underserved children.
3D printed visualization of the U.S. Treasury yield curve. Axes are time, maturity, and yield. Improvements over last year's model include decade labels on the time axis, a much longer time series beginning in 1971, and larger size of the model.