Each material comes with quite a number of tweakable technical and pricing parameters, and filling them out for similar materials one parameter at a time may become boring. That's where duplication comes in handy. 

Let's say you have set up Black Resin GPBK02 / Black Plastic for your Formlabs Form 2.

You could click "Add New Material" and start with Grey Resin from the top, 

, you could also instead click this icon:

This is the result. You can then edit the Black Resin GPBK02 copy / Black Plastic by clicking the edit icon:  

Simply change the Material name and the Display name:

and click "Save"
The result:

Except for Material Name and Display Name, the two materials are identical, and both are available on the widget:

That's it. 

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