Perfect, there was still an error, its fixed now
assignNewMaterialByLayer.py (2.4 KB)
Give it a spin tomorrow and let me know if it works 
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looks good with my inital tests… many many thanks for your help
I am pretty sure this is a Rhino Command now (according to this link) but I am not sure which version is was released with: SynchronizeRenderColors | Rhino 3-D modeling (mcneel.com)
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