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Z axis starting point

Hi Everyone.

I have finally got gcode onto the maslow and all looks good.
Except, when I press play the z axes jumps to a 50mm gap (instead of 3mm), to start with and starts lifting at 1mm a turn.
I think this might be a default start point but can I adjust this in Webcontrol?
The gcode is coming from qcadcam.

this would be set in qcadcam. look for ‘safe height’ settings


Also some programs define a z-height of zero at the bottom of the material, although the fact that it’s lifting with each turn seems like something weird is going on.

When you manually press the buttons to move the z-axis up and down does it go the right way?