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I dont seem to be able to slice this, the floor_beams.stl has self intersecting surfaces, even netfabb cant fix it. Im using simplify3d to slice it, printing onto a flashforge creator pro 3d.

A self intersecting surface is where one cube touches another so that the face of one is in the same plane as the face of another, the problem seems to be at the intersection of the beams, the cross connecting beams need to be slightly wider than the gap, so that they are intersecting the other beam, so that the faces dont have tbe same coordinates. Not all intersections are effected.