Our church uses iPads and Dymo printers for children check-in. Parents check in their child, a label prints on the printer, and they stick the label on the child’s shirt. We use Planning Center Check-ins of course, and it’s great!
One downside to Dymo printers, however, is that their software only runs on Mac and Windows, necessitating a full computer connected to the printer. (There’s no way that I know of to hook the Dymo printer directly to the iPad.)
I had the idea to use a Raspberry Pi as the computer instead of a full desktop machine. The setup looks something like this:
Great idea! Unfortunately, the labels are sent as a string of XML to a small Dymo tray application which converts them to PDFs. This Dymo tray application does not run on Linux. Womp womp.
This can’t be too hard… (Many weekends have been ruined by that short phrase.) We’ll just write our own XML->PDF conversion program in Ruby!
The result is: dymo-printer-agent
This little application runs on Linux (in my case, a Raspberry Pi running Raspbian) and converts Dymo’s label XML format into PDF and sends it to the printer driver.
It works great!
So, if you’re in the odd situation of wanting to print to a Dymo label printer on Linux, this project might be useful to you! I’ve tried to include all the relevant gotchas and instructions in the readme, so check it out.
Meta note: I dusted off the ol' blog to post about this project, because I’m no longer on Twitter. I’ll talk about that decision in another blog post.