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X and Y axis moving fine but Z axis very slow

X and Y axis moving fine but Z axis very slow

saw on a previous post about doing the Control/Shift/D and typing $$

do I just enter the following into the typing area?

$120=500.000
$110=200.000
$100=40.000

newbie - sorry - below is a screenshot of what I see when I do control/shift/d

image

See if my post #3 helps out. $110, $111, and $112 are the mm/min settings.

Calibrating my X-carve 1000 - X-Carve - Inventables Community Forum

$112 is the GRBL parameter for max feed rate, it can not be zero.
Change it to 50 and see if things improve. (Also check the $122 value, Z-acceleration)