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Re:Diffing The New York Times on thermal paper by mikegriff on Wednesday November 20, 2013 @04:27PM (#6771300)
Here's a longer write up on the hardware involved and thinking behind it. It's linked from the article but I thought this explained it better.

http://blog.nytlabs.com/2013/11/05/diff-a-live-comparator-fo...

Re:Diffing The New York Times on thermal paper by ddoolin on Wednesday November 20, 2013 @04:35PM (#6771344)
Very similar to Berg's Little Printer

http://bergcloud.com/littleprinter/

Re:Diffing The New York Times on thermal paper by jakeogh on Thursday November 21, 2013 @01:59AM (#6773445)
Related project: http://www.newsdiffs.org