This is where I found the note about not printing on letter size film:
Minimum Requirements for PiezoDN on the 3880:
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An Epson 3880.
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A macintosh computer.
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The PiezoDN Installer Package
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QuadtoneRIP
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PrintTool
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Piezography Selenium inks + GO and refillable cartridges.
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Pictorico UltraPremiumOHP Media*only this film is supported currently. We strongly
recommend printing on 11”+ wide media for this printer, not letter size.
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Palladium and other chemicals.
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AltProcess Paper.
10. A hair dryer.