Thanks Sean, that’s useful info to know.
I have switched the python node to a “delete elements node” from Archilab, this seems to work!
However, deleting so many elements at once seems to cause a crash, which is why I looked for python nodes to see if I could delete say a group of 10 at a time.
I have switched back to using a “delete element” python code I found in this thread. This seems to work also. So clearly my issue was within the python I was trying to use.
I think I need to go read this thread and understand it more before coming back to ask how to only delete a group of 10 elements at a time. If I need to do this and get stuck shall I make another thread?
Thanks again for the help.
Deleting elements using Python - Revit - Dynamo (dynamobim.com)