diff --git a/src/libslic3r/Config.cpp b/src/libslic3r/Config.cpp
index bd91dc7bb..8ee78e874 100644
--- a/src/libslic3r/Config.cpp
+++ b/src/libslic3r/Config.cpp
@@ -1353,6 +1353,18 @@ void ConfigBase::save_to_json(const std::string &file, const std::string &name,
     //record all the key-values
     for (const std::string &opt_key : this->keys())
     {
+        if (from.compare("project") == 0) {
+            if (opt_key.compare("print_host") == 0
+                || opt_key.compare("print_host_webui") == 0
+                || opt_key.compare("printhost_apikey") == 0
+                || opt_key.compare("printhost_cafile") == 0
+                || opt_key.compare("printhost_user") == 0
+                || opt_key.compare("printhost_password") == 0
+                || opt_key.compare("printhost_port") == 0
+                ) {
+                continue;
+            }
+        }
         const ConfigOption* opt = this->option(opt_key);
         if ( opt->is_scalar() ) {
             if (opt->type() == coString)
diff --git a/src/libslic3r/GCode.cpp b/src/libslic3r/GCode.cpp
index a20465535..f44eeb63d 100644
--- a/src/libslic3r/GCode.cpp
+++ b/src/libslic3r/GCode.cpp
@@ -3767,13 +3767,20 @@ void GCode::append_full_config(const Print &print, std::string &str)
 {
     const DynamicPrintConfig &cfg = print.full_print_config();
     // Sorted list of config keys, which shall not be stored into the G-code. Initializer list.
-    static constexpr auto banned_keys = {
+    static const std::set<std::string_view> banned_keys({
         "compatible_printers"sv,
-        "compatible_prints"sv
-    };
+        "compatible_prints"sv,
+        "print_host"sv,
+        "print_host_webui"sv,
+        "printhost_apikey"sv,
+        "printhost_cafile"sv,
+        "printhost_user"sv,
+        "printhost_password"sv,
+        "printhost_port"sv
+    });
     assert(std::is_sorted(banned_keys.begin(), banned_keys.end()));
     auto is_banned = [](const std::string &key) {
-        return std::binary_search(banned_keys.begin(), banned_keys.end(), key);
+        return banned_keys.find(key) != banned_keys.end();
     };
     for (const std::string &key : cfg.keys())
         if (! is_banned(key) && ! cfg.option(key)->is_nil())
diff --git a/src/libslic3r/Preset.cpp b/src/libslic3r/Preset.cpp
index c03741d29..41bdaa057 100644
--- a/src/libslic3r/Preset.cpp
+++ b/src/libslic3r/Preset.cpp
@@ -1867,6 +1867,10 @@ std::pair<Preset*, bool> PresetCollection::load_external_preset(
     cfg.erase("print_host_webui");
     cfg.erase("printhost_apikey");
     cfg.erase("printhost_cafile");
+    cfg.erase("printhost_user");
+    cfg.erase("printhost_password");
+    cfg.erase("printhost_port");
+
     const auto        &keys = cfg.keys();
     cfg.apply_only(combined_config, keys, true);
     std::string                 &inherits = Preset::inherits(cfg);
diff --git a/src/libslic3r/PresetBundle.cpp b/src/libslic3r/PresetBundle.cpp
index 88b917ced..d62dadcd7 100644
--- a/src/libslic3r/PresetBundle.cpp
+++ b/src/libslic3r/PresetBundle.cpp
@@ -1868,6 +1868,9 @@ DynamicPrintConfig PresetBundle::full_config_secure() const
     config.erase("print_host_webui");
     config.erase("printhost_apikey");
     config.erase("printhost_cafile");
+    config.erase("printhost_user");
+    config.erase("printhost_password");
+    config.erase("printhost_port");
     return config;
 }