If you’re just using coffee in a drip machine, french press, etc., you’ll be fine using a blender. Consistent grinds won’t matter much, though a more consistent grind will provide a more consistent flavor of your coffee. If your taste palettes can’t tell, you’ll be fine with a blender.
But if this is for espresso, a blender will be absolutely terrible for grinding coffee beans. Espresso requires a good, fine consistent grounds.
Very infrequently shopping the Greater Denver Area, Colorado Springs and in-between in Colorado these days.