Скачать или смотреть Spin Test - Popper is a Coffee Roaster (2025)

Watching the green coffee spin when you start up your Popper roast is important. The coffee should rotate and slightly bubble, and you know you have the right batch size. Even a few grams of coffee could make the difference. But I have found it hard to tell people EXACTLY what you should be looking for. Perfect situation to communicate this in a video!

The fan in an air roaster needs to do 2 different things at the same time: transfer the heat to the coffee to roast it, and keep the coffee moving in a way that it won’t scorch. Too little air movement and the coffee on the bottom near the heating element will burn, resulting in a scorched skunky roast taste, and an uneven batch. But too much air flow creates a different problem: the hot air blows by the coffee and out of the roaster, resulting in under-roasted coffee.

You want to find that perfect balance, and once you do, use a gram scale to use exactly the right amount of coffee to get consistent roasts. Besides the green coffee batch size, other factors come into play. The voltage level (and more importantly, voltage drop once you start the roaster) play a big role that I demonstrate a bit in the video. Other factors like ambient temperature and even altitude matter.

Hopefully this video guides you to understanding the variables with the Popper, or other air roasters. If there’s something I missed or left unclear, please comment so I can address it. -T

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Based in West Oakland, CA. Sweet Maria's sells green coffee and home roasting equipment. In our spare time, we make Youtube videos. Some are pretty informative, others are really fun, and the rest are just... kinda weird. Our sister business, CoffeeShrub, serves small roasting businesses.

Sweet Maria's Online Store: https://www.sweetmarias.com
Sweet Maria's Coffee Library: https://library.sweetmarias.com/