The patch which fixes it for the QL-550 is debian/patches/foomatic-data-
fixes.patch, already in repo, extract below:

---
--- a/printer/Brother-QL-550.xml
+++ b/printer/Brother-QL-550.xml
@@ -28,7 +28,7 @@
     <resolution>
       <dpi>
         <x>300</x>
-        <y>300</y>
+        <y>275</y>
       </dpi>
     </resolution>
     <consumables>
---

The issue is mentioned in passing in this Debian bug:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=555892 (search for the
text "275 dpi", message 5 by Lars Wirzenius).

I found another patch at https://github.com/mgrela/dropzone/blob/master
/net-print/ptouch-driver/files/ptouch-driver-1.3-fix-dpi-for-QL5x0.patch
which seems to do a much more comprehensive job of fixing the issue -

 * Makes a lot of changes to opt/Brother-Ptouch-Resolution.xml, the effects of 
which I'm not 100% sure about
 * The same 300dpi -> 275dpi patch we have on the QL-550, but applied to the 
QL-500 too.

I intend to test this on my QL-500 later today.

Brother only quote the "300dpi" figure, which is the resolution of the
thermal print head. If all else fails, I can put together a PDF label
with identical content, print it on Windows and with ptouch-driver and
compare the bitmap data and see what we're getting wrong.

** Bug watch added: Debian Bug tracker #555892
   http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=555892

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Title:
  QL-500 prints past end of label

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