
Prynt Pocket, priced at $150, is a portable printer that's designed to work with the iPhone, allowing you to print small 2x3 photos wherever you go thanks to ZINK paper, which does not require printer cartridges to work.
There are several of these iPhone-compatible miniature printers on the market, but the Prynt Pocket is unique because it's designed to connect to the iPhone using a Lightning connector, a feature that has both benefits and downsides.

Design
Of all the portable ZINK photo printers that I've tested, Prynt Pocket has the most complicated design and the biggest learning curve when it comes to using the device. The ZINK paper needs to be loaded into a separate paper cartridge in the correct orientation, and then the paper cartridge needs to be loaded into the portion of the Prynt Pocket that attaches to the phone.

From there, you need to adjust the size of the Prynt Pocket using a slider and accompanying button in order to fit it to your iPhone of choice. Then your iPhone needs to attach to the Prynt Pocket via the Lightning connector built into the device. With other printers, you basically unsnap a single compartment, load the paper, and then snap it back into place.

Prynt Pocket is designed this way so you can snap a photo with the device attached to your iPhone and then print it right away. I found that connecting the Prynt Pocket to my iPhone in this way was time consuming, and it wasn't a feature that I thought was useful as most of the time, I want to edit before I print. Editing with the Prynt Pocket attached to my phone was cumbersome, but there is a "Print" button right in the app if you want to snap a shot and then print sans editing.
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Article Link: Review: Prynt Pocket Turns Your iPhone Into an Instant Camera