Shrink to fit would be a feature of your printer driver rather than
Iexplorer. If you have a look at preferences under File|Print... you might
find some sort of zoom setting. If you print in Portrait orientation you
might find that the printout would not fit between vertical margins. Set
them to 0 under File|Page setup... and the printer driver might suggest
itself to set minimum margins and the printing works. If unsuccessful with
that - print in Landscape oriention.
Good luck!
Gunnar