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Cura Sacrificial Bridging for overhanging holes - issue

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I have a strange issue in Cura (3.6.0) when trying to bridge a hole with single layer sacrificial bride: Cora slices 4 squares into the bridge that gets printed mid-air (which is of course not working).

 

Does anyone have an idea what is going wrong here (attached pictures):

  • layer 67 has the big hole
  • layer 68 is the sacrificial bridge (with the 4 squares)
  • layer 69 is the first layer of the smaller hole

 

SacrificialBridgingCura67.PNG

SacrificialBridgingCura68.PNG

SacrificialBridgingCura69.PNG

Test.stl

Test.gcode

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