Dynamo needs to be run more than once for the right output?

[Yellowjacket98]

I believe I found the answer… I had suspected this might be the case but second-guessed my way away from it yesterday. Nonetheless, the issue is the same as attached here – pipe diameters need to be adjusted first, then adjust the flowlines and such. Do not try to do them at the same time.
Thanks!

Script executed twice

HI! I actually opened your sample project and dyn now and I found what the problem is: [image] Your feeding this value with the pipe offset befor changing the pipe height. I fixed this with extracting the offset from the element after changing the height: [image] It works correctly now.