The 3D printed stuff I've handled had a very unpleasant grain - rather like rough wood. I could feel the sub-millimeter layers that it was built up in, and they

The 3D printed stuff I've handled had a very unpleasant grain - rather like rough wood. I could feel the sub-millimeter layers that it was built up in, and they're not quite perfectly lined up. I don't know how difficult it is to 3D print stuff that feels pleasantly smooth.