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There are some smaller grain bins on Shapeways
That smallest N scale bins that I'm aware of are Imex's cast resin "Sukup" bins (1.5" diameter). Unfortunately, the corrugation is horizontal.Mark
Many of the old round galvanized livestock watering troughs were made with vertical corrugations. You might try looking to see if there are any HO scale (or larger) livestock troughs that could be stacked on top of each other to make a grain bin.
If all else fails, corrugated aluminum siding wrapped around a core would be easy enough. It doesn't work well for the larger horizontal-corrugation styles, but for this would be easy to do.
Another option is using this easy to bend/wrap corrugated siding:Mark