To Fix this, open up Firefox. Select the Orange Firefox tab, expand Print, and select Page Setup.
Select the Margins & Header/Footer tab.
Set Top, Left, Right and Bottom to 0.0.
Under Headers & Footers section, set all 6 drop down boxes to be --blank--
Select OK. Then log into RPii and print a receipt.
Any Questions on this, or if you have any other suggestions for a 'Carl Tip' that other people would find useful, drop me a line on support.