Intersect_with problems
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I've been using intersect_with to find the intersection of a cylinder (a group) and a prism (another group), where the prism is skewed relative to the prism. In some, but not all, instances the method drops an edge. Here's a pic:

The intersection breaks when you try it manually as well -- easy to fix, but rather undermines the idea of a plug-in! I'm attaching an abbreviated model.
Any ideas??
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I confirm the weirdness.
At first I thought that perhaps the dims were too small - but they are not [~43mm] !
Or the axes were messed up - they are not!
That one face refuses to intersect 'with the model' unless you move it [slightly]...It's plain weird

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Weird indeed but moving the prism up 1mm solves the problem.
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