Circular movement is required for grinding well. Some other shape examples are bulletshaped, king skull and smiley face grinders. Types of Dry Herb Grinders: Metal Grinders: Metal herb grinders have benefits of sharpen teeth that maximize its grinding efficiency. They are very easy to clean. You can simply wash them with your kitchenware. A .
Grinding is not necessary. Turn the dial all the way up for 12 minutes to preheat the unit then turn the dial down to about Pick the ENano up and hold it horizontal with your glass stem so your herb doesn't fall out.