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I figured this out myself. The problem was that I was using DK-1241 labels, which are 102mm x 152mm. However the page/media size was configured to be a different value, which prevented the printer from printing.
So I listed the available media sizes as follows:
```
$ lpoptions -p QL-1100 -l
```
which showed me a `102x152` option, which I selected as follows:
```
$ lpadmin -p QL-1100 -o PageSize=102x152
```
Note that the `lpadmin` command above will modify the `/etc/cups/ppd/QL-1100.ppd` file.
Also note that the page size can also be set using the CUPS web interface (i.e., by going to `http://localhost:631` in a web browser).
I was then able to print using this command:
```
$ lpr -P QL-1100 /path/to/file
```