I had this perforated steel utensil holder already and thought it may make a nice drum for a DIY coffee roaster. I lined it with mesh so beans can't fall through. I also cut very basic fins from aluminum I had laying around with tin snips. I bent them to about 90 degrees with a small hammer on the side of a butcher block cutting board. They are attached thru the holes that were already in caddy. I used very short bolts and faced them outward to reduce the chance of stuck beans during roasting.

The fins can be mounted flat or at an angle as there are a series of holes that can be used on the caddy. I had them angled at first to pull the beans towards the back of the drum when it spun but it turned out it wasn't that important. In fact, too steep an angle and the beans will stack in the rear and I think lead to less even heating.

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