Definition of S0929100 Cards for LabelWriter printers (including Dymo 450 LabelWriter), as this roll is missing in Linux Drivers (lw450.ppd and other .ppd files) and Macintosh dymo.ppd file. It's reconstructed by hand. I've send email to technical support, so let's work on this one until official specification for roll will arrive.
Please note you need to add each line to appropriate section in .ppd file according to : http://stackoverflow.com/a/3112256/544721
(On my systems, lw450.ppd files were located in /usr/share/cups/model/lw450.ppd)
Update:
When I tried to apply patch below on dymo-cups-drivers-1.4.0.5 (dymo-cups-drivers-1.4.0.tar.gz), it turned out that there is already another definition of w144h252 page.
Testing: