I realized that in my haste to post about printing on baked clay I neglected to give credit to the person who invented it - shame on me! You can read all about it on Foah Designs website. I was very hesitant to try it because printers and I have a long history of disasters together, but eventually I convinced myself by acknowledging that my printer was already 10 years old and I would love a new one anyway. If you follow her directions exactly in the tutorial, it works perfectly! I love the qualities of the finished print. It is perfect for flat applications ( but sadly not for beads, I'm still researching that..), but the print is fragile and needs to be protected with a layer of liquid polymer for durability.
I think Foah Designs is Pam Hall. I'm guessing this from looking at her Etsy shop - but I'm going to email her and thank her for sharing the results of her experimentation!
Here is a picture of one of her lovely wallets made using this technique: