This free Blender rig compliments our isometric rig tutorial.
The rig is set up to produce 256px wide isometric sprites, rendered from each of the 8 possible isometric angles.
Simply import your object and attach it to the hierarchy of the Base plane by dragging within the Scene panel in the top right. Then from the Render panel, choose an output destination and then the Animation button to render each of the 8 angles to separate files.