Yes you should weigh your batch for accuracy and consistency. We recommend doing your first roast with 85 grams of coffee, 3 ounces. You might find you can increase slightly, but it is very important that the coffee is turning in the roast chamber from the start. Two key points here: 1. Don't roast too much coffee: the coffee should move when you turn on the roaster. If it doesn't it will scorch. 2. Be consistent with how much you roast. Weigh or measure the exact same amount each time. The green coffee batch size is a big variable in roasting, and your roasts will be inconsistent and unpredictable if you vary the amount of coffee you roast. This video shows good bean movement!