"auto focus" on Gweike Cloud 50w

Hi.
Im having some trouble with the “autofocus”, on a Gweike cloud 50w laser

I´m trying to cut a 3mm akryl.
As i have read, the focus lens should be 14mm above my 3mm akryl, when cutting.
Im measuring 27mm Ive set my material field to 3mm
How to i adjust the focus lens, so when i type in 3mm , it will automatik move to the correct hight…

I think somewhere, my focus lens, are not calibratet…

Thx

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