Digital BW, The Print

>>The vacuum created by the head putting out ink is probably very weak, so
not only is it important not to lose vacuum, you need to have the bottles at
the right level also, to avoid head starvation.<<

That reminds me of something else I hadn't paid attention to until I
recently re-read the installation instructions.  When you split the end of
the tube ribbon into individual tubes to place inside the bottle, you don't
want them so long that they form a huge loop that rises higher than the
printer.  I think what they mean is to adjust the tubing so that it rises
out of the bottles and then only rises as high as needed to clear the top of
the printer opening.  The easy way to "adjust" this is to move your rack of
ink bottles farther away from your printer or farther toward the back of
your printer.  Yeah it is a basic thing, but as Steve pointed out, the print
head vacuum is pretty weak and every little bit might help - especially for
the people who seem to be having problems.