Inspired by Tom Taylor’s microprinter project, I’ve bought a Citizen CBM-231 thermal reciept printer of my own. I picked it up for just £20 on eBay, including shipping. It’s great.
Tom uses his to print the weather, his diary, where his friends are (according to Dopplr) and more. As soon as I saw it, I wanted one of my own to hack with. Reciepts, printed on cheap and recyclable thermal paper, are perfect for directions, schedules, TODO lists and other impermanent bits and pieces you might want to carry while you’re offline. I also like the idea of it politely telling me what I’m up to as part of my morning waking-up ritual. I have a feeling that the soft sound printing and the ‘clunk’ of the auto-cutting blade will be a nice start to the day.
A few hours of soldering and programming later, and I’m quite a happy hacker. I’ve put an Arduino sketch on github which shows how to easily print text and barcodes to the printer from an Arduino. It’s just a sketch at the moment, but I’ll turn it into a reusable library soon. With a few utility methods and constants, a “hello world” with two barcodes ends up looking as simple as this…
I know Tom has inspired a lot of people, and there are quite a few of these Citizen CBM-231 printers being repurposed at the moment. If you’re interested in building your own microprinter, you’ll hopefully find the wiki at microprinter.pbwiki.com useful.
Update: more microprinting fun including a book and sparklines.