I made a set of Coordinate Axes to go along with my two wedge solids from Multivariable Calculus.  The axes will also work well for my Double Riemann Approximations, my tetrahedra (coming soon), and other objects that I will print in the future.  The first issue with the axes was figuring out how to connect each part  – I tried using six rectangular prisms and Magic-Merge to join them together, but that did not work.  Later, with the help of Dave Pfaff, I extruded the coordinate axes out of a cube at the origin.  I then was able to imprint the labels for each of the axes much more easily. The axes can be found on Thingiverse here.