Hi Suzanne, There is currently no option to thicken the volume isosurface mesh lines. I've seen the need for thicker mesh lines when I export an image at high resolution. The one pixel thick lines then become hard to see, relative to the appearance on screen. I'll add a mesh line thickness option to the list of requested features. I'm not sure I understand what you mean by a "cubic grid". Do you mean you want cubes shown at each grid point where the density is above a threshold? We don't have anything to do that now, but it could be added. Would you want a cube centered at each grid point, or would you want adjacent grid points that are both above the threshold to be connected by lines? The latter approach would result in line segments that just end at the isosurface -- a prickly surface. Tom