EPSON thermal printer leaves too much margin on printing by Google Cloud Print

Question

I am using Google Cloud Print api to print receipts in EPSON TM T82II.I have specified print job ticket for 3 copies with no margin.But its not reflecting in my printouts.

{
    "version":"1.0",
    "print":{
        "vendor_ticket_item":[],
        "color":{
            "type":"STANDARD_MONOCHROME"
        },
        "margins":{
            "top_microns":0,
            "right_microns":0,
            "bottom_microns":0,
            "left_microns":0
        },
        "fit_to_page":{
            "type":1
        },
        "copies":{
            "copies":3
        }
    }
}