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I tested TPU,working well.working like a direct driver extruder,overall the print quality is between bowden and DDE,but lighter than DDE.it's a nice choice for a delta printer which seek for the balance between printing speed and print quality ,especially the large delta . fine-tuned bowden system is more sophisticated than this one,but ,like i said, this kind of design( flex3d,zesty nimble ) is easier to use and maintain than bowden,more like a DDE. On this point ,once try,can't go back.