Currently the links lead to a page saying "Documentation under construction". It would be nice to see a great overview just like this one, for example.

I don't understand the relationship between the current setting in Marlin and the Vref pot adjustment.

The Vref pot setting sets RMS average current. The factory setting of 1.23v results in a current of 870mA average.

That being said, does the Marlin current adjustment #define X_CURRENT 900 override the pot adjustment? Does it scale it? Are they two different things perhaps, one

To set an step as optional we have to add md-optional="any text" to the step directive. It make difficult making steps dynamically. I suggest to define optional steps as follow:

<md-step md-optional="{expression}" md-optional-text="Optional">

By this pattern we could dynamically define steps as optional. If expression is true step is optional and text could be show for it.

Am new to vue and sorry but this documentation is not friendly at all. Can you please provide an updated version of the doc cause am sure am not alone struggling to understand how to use it.

Per the Material Design docs (archived, as the current version doesn't seem to include Steppers), Steps should be able to be Editable, allowing the user to return to the step (directly) to edit values later, even when the stepper is in linear mode.