@CarlosRenĂȘ: As described above, there exists a patch for gtk. I described this 
in my answer on askubuntu: https://askubuntu.com/a/1544292 .
In short:

Create the patch print_dialog_without_avahi_discovered_printers.patch :

--- a/modules/printbackends/cups/gtkprintbackendcups.c
+++ b/modules/printbackends/cups/gtkprintbackendcups.c
@@ -4008,7 +4008,7 @@
           g_source_set_name_by_id (cups_backend->list_printers_poll, "[gtk+] 
cups_request_printer_list");
         }
 
-      avahi_request_printer_list (cups_backend);
+      // Do NOT add random network printers!    avahi_request_printer_list 
(cups_backend);
     }
 }
 


And reinstall gtk:
sudo apt build-dep libgtk-3-dev
apt source libgtk-3-dev
cd $(find gtk* -maxdepth 0 -type d)
git apply --reject --whitespace=fix 
../print_dialog_without_avahi_discovered_printers.patch
debuild -b  -us -uc  --no-pre-clean
cd ..
sudo apt install --reinstall ./libgtk-3-0_*.deb  
# do not update (dist-upgrade)
# sudo apt-mark hold libgtk-3-0

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https://bugs.launchpad.net/bugs/1753509

Title:
  avahi-daemon adds/installs every printer on network

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