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I intermittently encountered the same error, plus occasional winding errors, when I tried to repair my derivative. The errors go away if you * disable the second polyhedron, but I can't see anything wrong with the Python script that generates it.

Eventually I found a workaround by deleting the second polyhedron and replacing it with a copy of the first polyhedron prefixed with "translate([0,0,0.01]) scale([0.94,0.94,1.0]) " to cut out the hollow interior and offset it very slightly to avoid manifold errors. This gives approximately the sa
me 1.5mm wall thickness as the original Python output.

Another workaround is to delete the second polyhedron with "cylinder(h=80, r=23.4 );" to build a smooth interior wall. That gives a model whose walls vary from 1.5mm to 3.0mm in thickness due to the contours of the maze.