This intriguing geegaw is a homemade inkjet printer head that creates text in sugar instead of ink. It was constructed using a piezo buzzer as a control valve, whatever that means. The picture reminds me of the sugar-and-food-coloring letters you can buy in the grocery store to put on a birthday cake — but much, much cooler.
Go here to see the single-drop injection captured on video using a timed strobe.
Meanwhile, the Make blog also reports on an automatic cake decorator that is similar to a Spirograph for icing. The result is pictured left.