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The feeder
The feeder sits on top of the hive and is of an adaptation on the miller design. The two walls that stop the bees getting into the syrup are meant to sit flush with the top of the feeder, they don't in this model. They stick up 12mm, I am not sure what the line of thinking was here.
Once the roof is placed on top of the feeder there is space for the bees to run along the top inside edge and get into the feeder and drown! Looking at the roof it may have been designed to fit over this but it doesn’t! and there is a clear 12mm gap left between the roof and the feeder walls, which is more evident when you strap the roof down and see it bend over these two walls that protrude over the top of the feeder.
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