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I used to have a Canon LBP 5050. It is no longer connected to the network or the Mac. I removed the printer from: "System Preferences → Printers" and even removed the ppd from /Library/Printers, using Terminal, but for some reason it constantly reinstalls itself every time I reboot my machine.

As far as I can tell there is no special Canon software installed or gets "called up" as a logon item.

Does anyone have any ideas?

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How was the printer connected? USB directly? Via an Airport device? Using a network printer server? –  Pro Backup Jul 30 '12 at 11:57
LAN using the IP-Adress –  Casper Jul 30 '12 at 13:44
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2 Answers

The problem is, that some software after installing is deeply nested within the system, so if you try to un-istall it manually you might just scratch the surface and miss out on daemons or other relevant files.

I suggest you, to reinstall the software completely and then un-install it by using iTrash.app or CleanApp (both are available as trial-versions which will do for your case!)

edit: Take a look at these two directories /Library/Printers/Canon and /Users/Username/Library/Printers/Canon. You can delete the Drivers from there manually, but please make a backup first, just in case!

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No software was installed. Canon only supplied the driver files. –  Casper Feb 27 '12 at 11:03
I edited my original answer and added another possible solution. Please let me know if you succeeded Casper! –  v2r Feb 28 '12 at 4:56
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Somewhat of a hidden feature, you might want to try resetting the printing system.

  • Go to the Print and Scan preference pane.
  • Right click in the list of available printers (mine's empty).
  • Select "Reset printing system...".

print and scan prefpane

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