Dynamic Material Instancing through another blueprint?

You have two options:

Image from Gyazo

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Or:

This way you can bind the dispatcher call to another event elsewhere (outside the function) or even another function - super useful and it make it neater, with fewer wires snaking around.

Important: you must ensure the signature on the event / function:

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Is identical to the one on the Event Dispatcher:

Those two are not matching at all, for example! You can automate it by choosing a matching function / event from the list.