When I start my job (attached), it starts above the stock I would say about 100mm to high. I am just guessing at that height but certainly never reaches the stock.
If I jog to X and Y, that is correct.
If I jog to 6mm about stock, that works.
WOW, not sure what happened here. All I did was change to a different computer and saved the file and now it is working. I don’t think I changed anything.
From your above comments you used the BitZero to set X Y and “Z”. That would set your Z origin at the top of the material. If in the c2d file you used the bottom of material that would cause your air job. You can use the BitZero to set X and Y but you would need to move your BitZero to the spoilboard to set Z zero at the bottom.
When you use bottom of material for Z but set the Z at the top of the material CC thinks the bottom is the top of the material so the job runs the material thickness times 2 to start cutting. That is why you got the air job.