Also you may need a chimney (made from a can) if you don't already have one as the beans may spill out as it increases in mass during the roast. Then remember by adding a chimney you are again increasing the heat and further reducing the roast time.
Here's a video I did earlier this year.
home coffee roasting with a popcorn popper - YouTube
Here's a video I did earlier this year.
home coffee roasting with a popcorn popper - YouTube

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