Digital BW, The Print

Thanks again to everyone for your replies - they are much appreciated.

I've been able to get the cards to feed in about 50% of the time now,
which is I guess the best it's going to get.

However, the other problem I'm having is how the image is printing on
the card.

I know that borderless printing is not possible with custom size
sheets.  However, I'm not certain what the minimum border needs to be.
 Can anyone help with that?

For example, if I want to print an image on one half of the 7x10
custom sheet (5x7), it obviously cannot be 5x7 since it would have to
be borderless to get that size.  How large can the image be?  Do I
have to manually specify the border sizes in "Page Setup" when
defining the custom sheet size, or does the R2400 handle that
automatically?