First, neofetch:

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       _,met$$$$$gg.          user@host
    ,g$$$$$$$$$$$$$$$P.       -------------
  ,g$$P"     """Y$$.".        OS: Debian GNU/Linux 10 (buster) x86_64
 ,$$P'              `$$$.     Host: iMac12,1 1.0
',$$P       ,ggs.     `$$b:   Kernel: 4.19.0-6-amd64
`d$$'     ,$P"'   .    $$$    Uptime: 3 days, 6 hours, 11 mins
 $$P      d$'     ,    $$P    Packages: 3013 (dpkg)
 $$:      $$.   -    ,d$$'    Shell: bash 5.0.3
 $$;      Y$b._   _,d$P'      Resolution: 1920x1080, 1920x1080
 Y$$.    `.`"Y$$$$P"'         DE: KDE
 `$$b      "-.__              WM: KWin
  `Y$$                        Theme: Breeze [KDE], Breeze [GTK3]
   `Y$$.                      Icons: breeze [KDE], breeze [GTK3]
     `$$b.                    Terminal: konsole
       `Y$$b.                 Terminal Font: Hack 12
          `"Y$b._             CPU: Intel i5-2400S (4) @ 3.300GHz
              `"""            GPU: AMD ATI Radeon HD 6630M/6650M/6750M/7670M/76
                              GPU: Intel 2nd Generation Core Processor Family
                              Memory: 4901MiB / 11987MiB


Cups (http://127.0.0.1:631) only shows a single printer:

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Printers

Search in Printers:

Showing 1 of 1 printer.
Queue Name   Description   Location   Make and Model   Status
EPSON_ET-4750_Series   EPSON ET-4750 Series      Local Raw Printer   Idle

When I go to System Settings, then printers, it also shows that single printer.

When I run a KDE app like Okular, i get three printers: the Epson listed in Cups, then another copy of the same Epson, then a Laserjet I installed previously.

In non-KDE apps like Atril or Firefox, I just get the two spurious printers.

I can't get rid of these spurious printers.

Any pointers?