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Is there any special maintenance required in order to maintain food safety and keep the printer operating correctly?
For example, do I need to manually clean the print head periodically to prevent clogging or bacterial growth?
Also, how concerned should I be about bacterial growth in edible ink cartridges with sponges vs. those without sponges?
Everything I've found regarding mold and bacteria in edible ink printing seems to be vendor-promoted propaganda centered on the cartridges and ink themselves, and seem to reference examples of bacteria in kitchen sponges rather than in inkjet sponges. They do not mention mold or bacterial growth on the print head or in the printer's built-in sponge, each of which has a longer service life than an ink cartridge.
One edible ink vendor has a nice maintenance guide which somewhat addresses my question as it pertains to clogging, and it claims an average of 8 months for a print head's service life when used with edible ink. However, it focuses only on functional concerns and ignores the topic of mold/bacteria. Also, some of the other information in the document contradicts other online information about edible printing so I'm unsure about the validity of the document as a whole.
edible ink?! To Google! – Keltari – 2014-03-03T23:35:25.110
For anyone not familiar with edible ink printing, the concept basically involves using an inkjet printer to print on a thin frosting sheet (or rice paper), using food coloring instead of "normal" ink. Many bakeries use edible ink printing to put photographic images on cakes. If you ever use normal ink in the printer, the printer is considered tainted and should no longer be used for edible printing. – rob – 2014-03-03T23:49:57.083
1I suppose this is entirely on topic, even if its in the awesome but wierd confluence between seasoned advice and superuser but wouldn't the ink vendor be the best person to ask these sort of things? – Journeyman Geek – 2014-03-03T23:57:26.577
1@JourneymanGeek ink vendors provide conflicting information. Spongeless cartridge vendors seem to be using scare tactics and reference resources that show mold/bacteria on kitchen sponges, not inkjet sponges. Sponge-containing cartridge vendors claim their ink has mold/bacteria inhibitors. One vendor recommends using their $50 cleaning kit to clean the print head regularly/before storage. Some recommend using the printer driver's maintenance features, and others sell cleaning kits to unclog an already-clogged print head. Nothing on mold/bacteria in the print head or the printer's sponge. – rob – 2014-03-04T16:42:21.110
1The "ink" probably has to be wet to print and that means that if it has any food value at all, stuff will grow on it. If it dries up very quickly, that would minimize the problem, but not eliminate it. You could always make a couple of agar plates with covers, scrape a sample from the print head and see what grows. There's some pretty nasty stuff in the air that could potentially cause a problem, but a microbiologist would be able to give you a better answer. – Joe – 2014-03-10T21:08:27.683