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[leonard.moelders]

You could just translate the export to excel node to python and tell the python node to run only if it has an input. This input are the elements from the set parameter by name and value node.

The translation can be found in my post here:

How to use Data.ExportExcel method in a python scipt

Oh yes. My bad. I will change that in my post import clr import sys sys.path.append('C:\Program Files (x86)\IronPython 2.7\Lib') import System from System import Array from System.Collections.Generic import List as IList clr.AddReference('ProtoGeometry') from Autodesk.DesignScript.Geometry import * clr.AddReference("RevitNodes") import Revit clr.ImportExtensions(Revit.Elements) clr.ImportExtensions(Revit.GeometryConversion) clr.AddReference("RevitServices") import RevitServices from RevitS…