mlab.plot3d(yx, yy + lensoffset, yz, line_width=0.01, tube_radius=0.01)
mlab.plot3d(zx, zy + lensoffset, zz, line_width=0.01, tube_radius=0.01)
mlab.plot3d(xx, xy + lensoffset, xz, line_width=0.01, tube_radius=0.01)
How to plot proper 3D axes in MayaVi, like those found in Matplotlib