I'm familiar with head alignment, because that comes up every time I put in a new cartridge.

The afternoon, the Help Gremlins overheard me say to my husband, "I may stop at Office Depot to buy a new printer." This scared them so bad, they allowed Help to lead me to instructions (neither complete nor accurate) for how to clean the rollers, deep clean the nozzles and do a print-head alignment from the computer, rather than from the buttons on the printer.

I think cleaning the rollers has solved the problem. They may have been jiggling paper from side to side as printing proceeded. For a test, I just printed 5 separate copies of "The Galician Waltz", and each one is perfect.

Not only is the wavy effect gone, but the tiny vertical blank column that's been there for weeks has filled in. I suppose that was the result of today's deep cleaning of the nozzles, though I just did that procedure yesterday. I imagine the Help Gremlins had something to do with the final success.

After all, in the room where my printer is, the gremlins can hear cardinals sing and see lightning bugs. Can't do that in a landfill!

Thanks everybody, for your suggestions and encouragement. Come back for a link to the beautiful Galician Waltz. If you like it, PM me, and I will send you a jpg or MIDI. If it works.