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Changes
→GRBL settings
*open screen:
**<code>screen /dev/tty.usbmodem1421</code>
**copy and past the following (repeat any lines that have mistakesfail with "unsupported statement"):
<blockquote><pre>
$N0=G20
G20ok
G91M3ok
$0=6.964 (x, step/mm)
$1=6.964 (y, step/mm)