What is being filled is driven by your button mapping in the active. service  You can change the mapping or exclude the square bend itm.  Excluding with prevent it from being used in the fill process.

Nathan Chapman
Production Manager at General Heating and Air Conditioning

Revit Architecture Certified Professional
Revit MEP Mechanical Certified Professional
Revit MEP Electrical Certified Professional
DynaFabrication Package Author

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