Re: Problems with boolean subtract, or removing materal
There are a number of things wrong with the trapezium shape. There are internal surfaces inside the object and the normals are all over the place. You can check this by settings the surfaces to single sided (1S) and switching on display normals.
I made a new shape by copying the end of the shape into a single polygon (a quick rough copy) and extruding it.
In this image (from left to right), you can see your original shape, the new end, the extruded shape, the two objects positioned before selecting the box and the shape, the result of the boolean subtract. I'll attach the model.
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