diff --git a/crates/automation/src/printing.rs b/crates/automation/src/printing.rs
index 19cd48ef43..39cd45760e 100644
--- a/crates/automation/src/printing.rs
+++ b/crates/automation/src/printing.rs
@@ -6,6 +6,22 @@ use serde_json::{Value, json};
 
 use crate::{Args, Automation, Result, ToolError, failed, write_atomic};
 
+/// The job's two-sided setting for `doc_print`'s `duplex`: `printer` sends none, so the printer's
+/// own default applies (as the Print dialog's Printer default, #2422), except that cut and stack
+/// needs single-sided sheets.
+fn duplex(value: &str, cut_stack: bool) -> Result<Option<spool::Duplex>> {
+    Ok(match value {
+        "printer" if cut_stack => Some(spool::Duplex::Off),
+        "printer" => None,
+        "off" => Some(spool::Duplex::Off),
+        "long-edge" if cut_stack => return Err(bad("cut-and-stack printing needs duplex off (single-sided sheets)")),
+        "short-edge" if cut_stack => return Err(bad("cut-and-stack printing needs duplex off (single-sided sheets)")),
+        "long-edge" => Some(spool::Duplex::LongEdge),
+        "short-edge" => Some(spool::Duplex::ShortEdge),
+        d => return Err(bad(format!("unknown duplex {d:?}"))),
+    })
+}
+
 fn bad(m: impl Into<String>) -> ToolError {
     ToolError::InvalidArgs(m.into())
 }
@@ -92,9 +108,7 @@ impl Automation {
             },
             l => return Err(bad(format!("unknown layout {l:?}"))),
         };
-        if matches!(layout, Layout::Multiple { order: PageOrder::CutStack, .. }) && a.opt_str("duplex")?.unwrap_or("off") != "off" {
-            return Err(bad("cut-and-stack printing needs duplex off (single-sided sheets)"));
-        }
+        let duplex = duplex(a.opt_str("duplex")?.unwrap_or("off"), matches!(layout, Layout::Multiple { order: PageOrder::CutStack, .. }))?;
         if a.opt_str("order")? == Some("cut-stack") && !matches!(layout, Layout::Multiple { .. }) {
             return Err(bad("cut-stack order needs layout multiple"));
         }
@@ -153,12 +167,7 @@ impl Automation {
                     printer: if printer == "default" { None } else { Some(printer.to_string()) },
                     copies: a.opt_int("copies")?.unwrap_or(1).clamp(1, 999) as u32,
                     collate: a.opt_bool("collate")?.unwrap_or(true),
-                    duplex: Some(match a.opt_str("duplex")?.unwrap_or("off") {
-                        "off" => spool::Duplex::Off,
-                        "long-edge" => spool::Duplex::LongEdge,
-                        "short-edge" => spool::Duplex::ShortEdge,
-                        d => return Err(bad(format!("unknown duplex {d:?}"))),
-                    }),
+                    duplex,
                     scaling: spool::Scaling::Exact,
                     grayscale: a.opt_bool("grayscale")?.unwrap_or(false),
                     title: name,
@@ -181,3 +190,21 @@ impl Automation {
         Ok(out)
     }
 }
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    /// `printer` leaves two-sided to the printer's own default (#2422); cut and stack still asks
+    /// for single-sided sheets, and refuses an explicit edge.
+    #[test]
+    fn duplex_printer_leaves_two_sided_to_the_printer() {
+        assert_eq!(duplex("printer", false).ok(), Some(None));
+        assert_eq!(duplex("printer", true).ok(), Some(Some(spool::Duplex::Off)));
+        assert_eq!(duplex("off", false).ok(), Some(Some(spool::Duplex::Off)));
+        assert_eq!(duplex("long-edge", false).ok(), Some(Some(spool::Duplex::LongEdge)));
+        assert_eq!(duplex("short-edge", false).ok(), Some(Some(spool::Duplex::ShortEdge)));
+        assert!(duplex("long-edge", true).is_err());
+        assert!(duplex("sideways", false).is_err());
+    }
+}
diff --git a/crates/automation/src/tools.rs b/crates/automation/src/tools.rs
index b0c5c8cb2b..04ce1fc0a4 100644
--- a/crates/automation/src/tools.rs
+++ b/crates/automation/src/tools.rs
@@ -518,7 +518,7 @@ pub fn tools() -> Vec<ToolDef> {
                 "printer": { "type": "string" },
                 "copies": { "type": "integer", "minimum": 1, "maximum": 999 },
                 "collate": { "type": "boolean" },
-                "duplex": { "type": "string", "enum": ["off", "long-edge", "short-edge"] },
+                "duplex": { "type": "string", "enum": ["off", "long-edge", "short-edge", "printer"], "description": "Two-sided printing (default off); printer sends no setting, so the printer's own default applies." },
                 "grayscale": { "type": "boolean" },
                 "as_image": { "type": "boolean", "description": "Print as image (Acrobat's Advanced Print Setup): every page rendered to a picture at dpi before it is placed on the paper, for printers that skip text, shading or transparency; the print is no longer searchable text, and with grayscale the pictures are grey." },
                 "dpi": { "type": "number", "minimum": 72, "maximum": 600, "description": "Resolution for as_image (default 300)." },
diff --git a/crates/automation/tests/automation.rs b/crates/automation/tests/automation.rs
index 624187c5ef..aa777fae67 100644
--- a/crates/automation/tests/automation.rs
+++ b/crates/automation/tests/automation.rs
@@ -5683,6 +5683,9 @@ fn cut_stack_printing_through_tools() {
     }
     assert!(matches!(a.call("doc_print", &json!({"doc": doc, "order": "cut-stack", "path": "refused.pdf"})), Err(ToolError::InvalidArgs(_))));
     assert!(!dir.join("refused.pdf").exists());
+    // The printer's own two-sided default isn't refused: cut and stack sends single-sided (#2422).
+    ok(&mut a, "doc_print", json!({"doc": doc, "layout": "multiple", "order": "cut-stack", "duplex": "printer", "path": "printer-default.pdf"}));
+    assert!(dir.join("printer-default.pdf").exists());
     assert!(a.call("doc_print", &json!({"doc": doc, "layout": "multiple", "order": "cut-stack", "path": "../escaped.pdf"})).is_err());
     let _ = std::fs::remove_dir_all(dir);
 }
diff --git a/crates/ui-egui/src/i18n/ar.tsv b/crates/ui-egui/src/i18n/ar.tsv
index f6b3d093d5..b07c097955 100644
--- a/crates/ui-egui/src/i18n/ar.tsv
+++ b/crates/ui-egui/src/i18n/ar.tsv
@@ -1219,6 +1219,7 @@
 	Off	متوقف
 	Flip on long edge	قلب على الحافة الطويلة
 	Flip on short edge	قلب على الحافة القصيرة
+	Printer default	افتراضي الطابعة
 	Paper:	الورق:
 	Pages to Print	الصفحات المراد طباعتها
 	More options:	خيارات أخرى:
diff --git a/crates/ui-egui/src/i18n/bg.tsv b/crates/ui-egui/src/i18n/bg.tsv
index 90e152c27b..c749ee1ac7 100644
--- a/crates/ui-egui/src/i18n/bg.tsv
+++ b/crates/ui-egui/src/i18n/bg.tsv
@@ -899,6 +899,7 @@
 	Off	Изключено
 	Flip on long edge	Обръщане по дългия ръб
 	Flip on short edge	Обръщане по късия ръб
+	Printer default	По подразбиране за принтера
 	Paper:	Хартия:
 	Pages to Print	Страници за печат
 	More options:	Още опции:
diff --git a/crates/ui-egui/src/i18n/cs.tsv b/crates/ui-egui/src/i18n/cs.tsv
index 1366cb2546..7baa4ac983 100644
--- a/crates/ui-egui/src/i18n/cs.tsv
+++ b/crates/ui-egui/src/i18n/cs.tsv
@@ -1287,6 +1287,7 @@ key	Space	Mezerník
 	Off	Vypnuto
 	Flip on long edge	Převrátit podle delší strany
 	Flip on short edge	Převrátit podle kratší strany
+	Printer default	Podle tiskárny
 	Paper:	Papír:
 	Pages to Print	Stránky k tisku
 	More options:	Další možnosti:
diff --git a/crates/ui-egui/src/i18n/de.tsv b/crates/ui-egui/src/i18n/de.tsv
index ac136cd91a..861c9a2039 100644
--- a/crates/ui-egui/src/i18n/de.tsv
+++ b/crates/ui-egui/src/i18n/de.tsv
@@ -1205,6 +1205,7 @@
 	Off	Aus
 	Flip on long edge	An langer Kante wenden
 	Flip on short edge	An kurzer Kante wenden
+	Printer default	Druckerstandard
 	Paper:	Papier:
 	Pages to Print	Zu druckende Seiten
 	More options:	Weitere Optionen:
diff --git a/crates/ui-egui/src/i18n/el.tsv b/crates/ui-egui/src/i18n/el.tsv
index 133e8ca8e6..f4ecbdf903 100644
--- a/crates/ui-egui/src/i18n/el.tsv
+++ b/crates/ui-egui/src/i18n/el.tsv
@@ -764,6 +764,7 @@
 	Two-sided:	Εκτύπωση διπλής όψης:
 	Flip on long edge	Αναστροφή στη μεγάλη πλευρά
 	Flip on short edge	Αναστροφή στη μικρή πλευρά
+	Printer default	Προεπιλογή εκτυπωτή
 	Paper:	Χαρτί:
 	Pages to Print	Σελίδες προς εκτύπωση
 	More options:	Περισσότερες επιλογές:
diff --git a/crates/ui-egui/src/i18n/es.tsv b/crates/ui-egui/src/i18n/es.tsv
index 7c7b7c8d71..a2e5124e0d 100644
--- a/crates/ui-egui/src/i18n/es.tsv
+++ b/crates/ui-egui/src/i18n/es.tsv
@@ -1214,6 +1214,7 @@
 	Off	Desactivado
 	Flip on long edge	Voltear por el borde largo
 	Flip on short edge	Voltear por el borde corto
+	Printer default	Predeterminado de la impresora
 	Paper:	Papel:
 	Pages to Print	Páginas que imprimir
 	More options:	Más opciones:
diff --git a/crates/ui-egui/src/i18n/fr.tsv b/crates/ui-egui/src/i18n/fr.tsv
index aa83f81970..4bc3b717d1 100644
--- a/crates/ui-egui/src/i18n/fr.tsv
+++ b/crates/ui-egui/src/i18n/fr.tsv
@@ -1200,6 +1200,7 @@
 	Off	Désactivé
 	Flip on long edge	Retourner sur le bord long
 	Flip on short edge	Retourner sur le bord court
+	Printer default	Par défaut de l'imprimante
 	Paper:	Papier :
 	Pages to Print	Pages à imprimer
 	More options:	Plus d'options :
diff --git a/crates/ui-egui/src/i18n/hu.tsv b/crates/ui-egui/src/i18n/hu.tsv
index 123be343f3..1089392348 100644
--- a/crates/ui-egui/src/i18n/hu.tsv
+++ b/crates/ui-egui/src/i18n/hu.tsv
@@ -1190,6 +1190,7 @@
 	Off	Ki
 	Flip on long edge	Hosszú él mentén
 	Flip on short edge	Rövid él mentén
+	Printer default	Nyomtató alapértéke
 	Paper:	Papír:
 	Pages to Print	Nyomtatandó oldalak
 	More options:	További beállítások:
diff --git a/crates/ui-egui/src/i18n/it.tsv b/crates/ui-egui/src/i18n/it.tsv
index 71715dc5d7..f4b9b55d9d 100644
--- a/crates/ui-egui/src/i18n/it.tsv
+++ b/crates/ui-egui/src/i18n/it.tsv
@@ -1216,6 +1216,7 @@
 	Off	Disattivato
 	Flip on long edge	Rilegatura sul lato lungo
 	Flip on short edge	Rilegatura sul lato corto
+	Printer default	Come da stampante
 	Paper:	Carta:
 	Pages to Print	Pagine da stampare
 	More options:	Altre opzioni:
diff --git a/crates/ui-egui/src/i18n/ja.tsv b/crates/ui-egui/src/i18n/ja.tsv
index f73e753def..0e9b17cf97 100644
--- a/crates/ui-egui/src/i18n/ja.tsv
+++ b/crates/ui-egui/src/i18n/ja.tsv
@@ -1220,6 +1220,7 @@
 	Off	オフ
 	Flip on long edge	長辺とじ
 	Flip on short edge	短辺とじ
+	Printer default	プリンターの既定
 	Paper:	用紙:
 	Pages to Print	印刷するページ
 	More options:	詳細オプション:
diff --git a/crates/ui-egui/src/i18n/kk.tsv b/crates/ui-egui/src/i18n/kk.tsv
index 7f113d4bfc..0d88ecf969 100644
--- a/crates/ui-egui/src/i18n/kk.tsv
+++ b/crates/ui-egui/src/i18n/kk.tsv
@@ -1164,6 +1164,7 @@
 	Off	Өшірулі
 	Flip on long edge	Ұзын жиек бойынша аудару
 	Flip on short edge	Қысқа жиек бойынша аудару
+	Printer default	Принтер әдепкісі
 	Paper:	Қағаз:
 	Pages to Print	Басып шығарылатын беттер
 	More options:	Қосымша параметрлер:
diff --git a/crates/ui-egui/src/i18n/lt.tsv b/crates/ui-egui/src/i18n/lt.tsv
index 6448c6949e..8d1c784cf2 100644
--- a/crates/ui-egui/src/i18n/lt.tsv
+++ b/crates/ui-egui/src/i18n/lt.tsv
@@ -592,6 +592,7 @@
 	Flip horizontal	Apversti horizontaliai
 	Flip on long edge	Apversti per ilgąją kraštinę
 	Flip on short edge	Apversti per trumpąją kraštinę
+	Printer default	Pagal spausdintuvą
 	Flip vertical	Apversti vertikaliai
 	Folders	Aplankai
 	Font Size:	Šrifto dydis:
diff --git a/crates/ui-egui/src/i18n/pl.tsv b/crates/ui-egui/src/i18n/pl.tsv
index 578b512bb7..40f799a554 100644
--- a/crates/ui-egui/src/i18n/pl.tsv
+++ b/crates/ui-egui/src/i18n/pl.tsv
@@ -1203,6 +1203,7 @@
 	Off	Wyłączony
 	Flip on long edge	Odwracaj wzdłuż długiej krawędzi
 	Flip on short edge	Odwracaj wzdłuż krótkiej krawędzi
+	Printer default	Domyślne drukarki
 	Paper:	Papier:
 	Pages to Print	Strony do wydrukowania
 	More options:	Więcej opcji:
diff --git a/crates/ui-egui/src/i18n/pt-br.tsv b/crates/ui-egui/src/i18n/pt-br.tsv
index ee12fe7ab2..5bce3ae4fc 100644
--- a/crates/ui-egui/src/i18n/pt-br.tsv
+++ b/crates/ui-egui/src/i18n/pt-br.tsv
@@ -845,6 +845,7 @@
 	Off	Desativado
 	Flip on long edge	Virar na borda longa
 	Flip on short edge	Virar na borda curta
+	Printer default	Padrão da impressora
 	Paper:	Papel:
 	Pages to Print	Páginas a imprimir
 	More options:	Mais opções:
diff --git a/crates/ui-egui/src/i18n/ru.tsv b/crates/ui-egui/src/i18n/ru.tsv
index 3baec45600..62a9535d00 100644
--- a/crates/ui-egui/src/i18n/ru.tsv
+++ b/crates/ui-egui/src/i18n/ru.tsv
@@ -1220,6 +1220,7 @@
 	Off	Выкл
 	Flip on long edge	Переворот по длинной стороне
 	Flip on short edge	Переворот по короткой стороне
+	Printer default	По умолчанию для принтера
 	Paper:	Бумага:
 	Pages to Print	Страницы для печати
 	More options:	Дополнительные параметры:
diff --git a/crates/ui-egui/src/i18n/sl.tsv b/crates/ui-egui/src/i18n/sl.tsv
index 5ba9dc90c3..b1135979d6 100644
--- a/crates/ui-egui/src/i18n/sl.tsv
+++ b/crates/ui-egui/src/i18n/sl.tsv
@@ -839,6 +839,7 @@
 	Flip image	Prezrcali sliko
 	Flip on long edge	Obrni po dolgem robu
 	Flip on short edge	Obrni po kratkem robu
+	Printer default	Privzeto tiskalnika
 	Flip vertical	Prezrcali navpično
 	Folders	Mape
 	Font Size:	Velikost pisave:
diff --git a/crates/ui-egui/src/i18n/te.tsv b/crates/ui-egui/src/i18n/te.tsv
index e0d6a2b34c..0b8533c3b2 100644
--- a/crates/ui-egui/src/i18n/te.tsv
+++ b/crates/ui-egui/src/i18n/te.tsv
@@ -1190,6 +1190,7 @@ comment menu	Edit	సవరించు
 	Off	ఆఫ్
 	Flip on long edge	పొడవైన అంచున తిరగేయి
 	Flip on short edge	పొట్టి అంచున తిరగేయి
+	Printer default	ప్రింటర్ డిఫాల్ట్
 	Paper:	కాగితం:
 	Pages to Print	ముద్రించాల్సిన పేజీలు
 	More options:	మరిన్ని ఎంపికలు:
diff --git a/crates/ui-egui/src/i18n/tr.tsv b/crates/ui-egui/src/i18n/tr.tsv
index 48d34a30da..aead2b0c99 100644
--- a/crates/ui-egui/src/i18n/tr.tsv
+++ b/crates/ui-egui/src/i18n/tr.tsv
@@ -1177,6 +1177,7 @@
 	Off	Kapalı
 	Flip on long edge	Uzun kenardan çevir
 	Flip on short edge	Kısa kenardan çevir
+	Printer default	Yazıcı varsayılanı
 	Paper:	Kağıt:
 	Pages to Print	Yazdırılacak Sayfalar
 	More options:	Diğer seçenekler:
diff --git a/crates/ui-egui/src/i18n/uk.tsv b/crates/ui-egui/src/i18n/uk.tsv
index 246a4a2c56..af7a9517ac 100644
--- a/crates/ui-egui/src/i18n/uk.tsv
+++ b/crates/ui-egui/src/i18n/uk.tsv
@@ -1217,6 +1217,7 @@
 	Off	Вимкнено
 	Flip on long edge	Перевертати за довгим краєм
 	Flip on short edge	Перевертати за коротким краєм
+	Printer default	За замовчуванням принтера
 	Paper:	Папір:
 	Pages to Print	Сторінки для друку
 	More options:	Додаткові параметри:
diff --git a/crates/ui-egui/src/i18n/vi.tsv b/crates/ui-egui/src/i18n/vi.tsv
index 56caf38859..5ea0baa431 100644
--- a/crates/ui-egui/src/i18n/vi.tsv
+++ b/crates/ui-egui/src/i18n/vi.tsv
@@ -589,6 +589,7 @@ theme	Appearance	Giao diện
 	Flip horizontal	Lật ngang
 	Flip on long edge	Lật theo cạnh dài
 	Flip on short edge	Lật theo cạnh ngắn
+	Printer default	Mặc định của máy in
 	Flip vertical	Lật dọc
 	Folders	Thư mục
 	Font Size:	Cỡ chữ:
diff --git a/crates/ui-egui/src/i18n/zh-hans.tsv b/crates/ui-egui/src/i18n/zh-hans.tsv
index 645c0ab301..301c5868f1 100644
--- a/crates/ui-egui/src/i18n/zh-hans.tsv
+++ b/crates/ui-egui/src/i18n/zh-hans.tsv
@@ -906,6 +906,7 @@
 	Off	关
 	Flip on long edge	沿长边翻转
 	Flip on short edge	沿短边翻转
+	Printer default	打印机默认
 	Paper:	纸张：
 	Pages to Print	要打印的页面
 	More options:	更多选项：
diff --git a/crates/ui-egui/src/i18n/zh-hant.tsv b/crates/ui-egui/src/i18n/zh-hant.tsv
index 712f0666a5..dd74c484e3 100644
--- a/crates/ui-egui/src/i18n/zh-hant.tsv
+++ b/crates/ui-egui/src/i18n/zh-hant.tsv
@@ -850,6 +850,7 @@
 	Off	關
 	Flip on long edge	沿長邊翻轉
 	Flip on short edge	沿短邊翻轉
+	Printer default	印表機預設
 	Paper:	紙張：
 	Pages to Print	要列印的頁面
 	More options:	更多選項：
diff --git a/crates/ui-egui/src/print_ui.rs b/crates/ui-egui/src/print_ui.rs
index 186d8edc43..deb31ce04c 100644
--- a/crates/ui-egui/src/print_ui.rs
+++ b/crates/ui-egui/src/print_ui.rs
@@ -51,7 +51,8 @@ pub struct PrintDraft {
     pub copies: u32,
     pub collate: bool,
     pub grayscale: bool,
-    pub duplex: spool::Duplex,
+    /// `None` = the printer's own default (its Properties), as Acrobat does.
+    pub duplex: Option<spool::Duplex>,
     pub which: Which,
     pub range: String,
     /// The pages `Which::Selected` prints (0-based, in page order); empty when none were picked.
@@ -108,7 +109,7 @@ impl Default for PrintDraft {
             copies: 1,
             collate: true,
             grayscale: false,
-            duplex: spool::Duplex::Off,
+            duplex: None,
             which: Which::All,
             range: String::new(),
             selected: Vec::new(),
@@ -168,7 +169,7 @@ impl PrintDraft {
 
     /// The engine settings for this draft (page count and labels from the document).
     pub fn settings(&self, count: usize, labels: &[String]) -> Result<print::Settings, String> {
-        if self.handling == Handling::Multiple && self.order == PageOrder::CutStack && self.duplex != spool::Duplex::Off {
+        if self.cut_and_stack() && matches!(self.duplex, Some(spool::Duplex::LongEdge | spool::Duplex::ShortEdge)) {
             return Err("Cut and stack needs Two-sided: Off. Print single-sided sheets.".into());
         }
         let range = match self.which {
@@ -211,12 +212,17 @@ impl PrintDraft {
         })
     }
 
+    fn cut_and_stack(&self) -> bool {
+        self.handling == Handling::Multiple && self.order == PageOrder::CutStack
+    }
+
     pub fn job(&self, title: &str) -> spool::Job {
         spool::Job {
             printer: self.printer.clone(),
             copies: self.copies.max(1),
             collate: self.collate,
-            duplex: Some(self.duplex),
+            // Cut and stack needs single-sided sheets, whatever the printer's default.
+            duplex: if self.cut_and_stack() { Some(spool::Duplex::Off) } else { self.duplex },
             scaling: spool::Scaling::Exact,
             grayscale: self.grayscale,
             title: title.to_string(),
@@ -928,9 +934,10 @@ pub(crate) fn body(
                         "duplex",
                         &mut d.duplex,
                         &[
-                            (spool::Duplex::Off, tl!("Off")),
-                            (spool::Duplex::LongEdge, tl!("Flip on long edge")),
-                            (spool::Duplex::ShortEdge, tl!("Flip on short edge")),
+                            (None, tl!("Printer default")),
+                            (Some(spool::Duplex::Off), tl!("Off")),
+                            (Some(spool::Duplex::LongEdge), tl!("Flip on long edge")),
+                            (Some(spool::Duplex::ShortEdge), tl!("Flip on short edge")),
                         ],
                         160.0,
                     );
@@ -1305,11 +1312,25 @@ mod tests {
 
     #[test]
     fn composed_sheets_keep_exact_scaling_and_the_dialogs_duplex_choice() {
-        let draft = PrintDraft { duplex: spool::Duplex::LongEdge, ..PrintDraft::default() };
+        let draft = PrintDraft { duplex: Some(spool::Duplex::LongEdge), ..PrintDraft::default() };
         let job = draft.job("report.pdf");
         assert_eq!(job.scaling, spool::Scaling::Exact);
         assert_eq!(job.duplex, Some(spool::Duplex::LongEdge));
-        assert_eq!(PrintDraft::default().job("report.pdf").duplex, Some(spool::Duplex::Off));
+        let off = PrintDraft { duplex: Some(spool::Duplex::Off), ..PrintDraft::default() };
+        assert_eq!(off.job("report.pdf").duplex, Some(spool::Duplex::Off));
+    }
+
+    /// Untouched, Two-sided sends nothing, so the duplex set in the printer's Properties applies
+    /// (#2422); cut and stack still asks for single-sided sheets.
+    #[test]
+    fn two_sided_follows_the_printer_until_chosen() {
+        assert_eq!(PrintDraft::default().duplex, None);
+        assert_eq!(PrintDraft::default().job("report.pdf").duplex, None);
+        let mut cut = PrintDraft { handling: Handling::Multiple, order: PageOrder::CutStack, ..PrintDraft::default() };
+        assert_eq!(cut.job("report.pdf").duplex, Some(spool::Duplex::Off));
+        assert!(cut.settings(4, &[]).is_ok(), "the printer's default doesn't block cut and stack");
+        cut.duplex = Some(spool::Duplex::ShortEdge);
+        assert!(cut.settings(4, &[]).is_err());
     }
 
     /// A job being spooled holds the progress card, counting its sheets as the spooler reports
diff --git a/crates/ui-egui/tests/print.rs b/crates/ui-egui/tests/print.rs
index 96a7e12f14..7454c03a8d 100644
--- a/crates/ui-egui/tests/print.rs
+++ b/crates/ui-egui/tests/print.rs
@@ -182,11 +182,11 @@ fn cut_stack_dialog_previews_saves_and_refuses_duplex() {
     h.get_by_label("›").click();
     h.run_steps(2);
     h.get_by_label("Sheet 2 of 3");
-    h.state_mut().print_draft.duplex = Duplex::LongEdge;
+    h.state_mut().print_draft.duplex = Some(Duplex::LongEdge);
     h.run_steps(2);
     h.get_by_label_contains("Cut and stack needs Two-sided: Off");
     assert!(!h.state_mut().print_now());
-    h.state_mut().print_draft.duplex = Duplex::Off;
+    h.state_mut().print_draft.duplex = Some(Duplex::Off);
     h.state_mut().print_draft.printer = None;
     let out = std::env::temp_dir().join(format!("pdfcraft-cut-stack-ui-{}.pdf", std::process::id()));
     h.state_mut().save_override = Some(out.to_string_lossy().into_owned());
diff --git a/parity/acrobat-features.toml b/parity/acrobat-features.toml
index 20a5a69e4f..c592bca6c6 100644
--- a/parity/acrobat-features.toml
+++ b/parity/acrobat-features.toml
@@ -8020,8 +8020,8 @@ milestone = "M10"
 status = "shipped"
 commands = ["print.dialog"]
 tools = ["doc_print"]
-evidence = ["crates/print/src/tests.rs::spooler_arguments_and_printer_list"]
-notes = "long/short edge via the spooler: lp -o sides=…, and the Windows driver's Duplex setting"
+evidence = ["crates/print/src/tests.rs::spooler_arguments_and_printer_list", "crates/ui-egui/src/print_ui.rs::two_sided_follows_the_printer_until_chosen", "crates/automation/src/printing.rs::duplex_printer_leaves_two_sided_to_the_printer"]
+notes = "long/short edge via the spooler: lp -o sides=…, and the Windows driver's Duplex setting. Two-sided starts at Printer default, as in Acrobat: nothing is sent, so the printer's own default (its Properties) applies until Off or an edge is chosen (doc_print: duplex \"printer\"). Missing: the document's /ViewerPreferences /Duplex preset isn't read yet"
 
 [[feature]]
 id = "print.n-up"