Printing QR CODE

I've designed a report with a qrcode that has 1.80 in height and witdh properties.
In the preview looks perfect but when printing on a thermal printer or a laser one, it gets too much bigger.
Any idea of what its wrong ??
Thanks.
In the preview looks perfect but when printing on a thermal printer or a laser one, it gets too much bigger.
Any idea of what its wrong ??
Thanks.
Comments
I wil try to attach some screens to clarify the problem.
Thanks.
Thanks.
Thanks so much..
What is the better way ? Any idea ??
Many thanks !!