parameter reference:

for "Lego Material for Blender"

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This document will list all the different options available in the material, and what those options do.

A picture of the node group

The default values for the material are:

You will probably need to tweak many of the values shown here, depending on the scale and UVs of your bricks. Some of the pictures in this article are out of date, but they will give you an idea of what the properties should do.