I wonder how their slicer is handling the infill angles. I suspect the bridge detection is only kicking in on the top layer, which ensures the infill angle is perpendicular to the gap. The bottom layer is going to follow a global angle and eventually run parallel to a hinge as the design gets complex (hence a later design failing and requiring thick hinges).
Painting infill angles would be tedious. I bet with concentric infill and some clever zero width cuts you could make all of the hinges perfectly perpendicular.
by jamothy
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Thanks for sharing! I absolutely adore the meshing of mechanical engineering and origami. I cannot believe I never considered it.
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