xx = yy = zz = np.arange(-0.6, 0.7, 0.1)
xy = xz = yx = yz = zx = zy = np.zeros_like(xx)
mlab.plot3d(yx, yy + lensoffset, yz, line_width=0.01, tube_radius=0.01)
How to plot proper 3D axes in MayaVi, like those found in Matplotlib