Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
undefined
From that photo you can see that it's a dot from the stencil on the chip. It looks ok.
No one has replied
@gcorthey assuming that you don't have a DueX board connected, you can use one of the endstop pins on the expansion connector, for example "exp.e2stop".
@gcorthey
Do you have a tool selected?
Frederick