Digital BW, The Print

After a couple of days of non-use I get really bad nozzle checks.  I 
was advised to keep the printer on.  A couple of cleanings and the 
checks get better, so I made 4 prints which looked very good.  Did 
another nozzle check and darned if there still aren't some empty 
spots.

Is it better to shut the printer off when you're not going to use it 
for a few days, or should you leave it on.  Should you print something 
just for the sake of pushing ink through the hoses?

isabel