This cheap copy of Ardunio CNC Shield has an old version and does not work with the latest version of Grbl which is 1.1 at the time of writing this review. You can use Grbl 0.8c or control the Z-Limit and Spindle Enable pins from the board. Version 0.8c can be found here https://github.com/grbl/grbl. Apparently only version 3.51 is compatible with Grbl 1.1.
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