fix(kprofiles): stop reporting rejected K-profile writes as saved

Saving a K-profile was fire-and-forget. set_kprofiles_batch published
    and returned True, and the printer's extrusion_cali_set answer was
    logged at DEBUG and dropped, so a write the printer refused was
    reported to the user as saved (#2718, reporter @jmoore-skild).

    The reason it could not simply be gated on: the answer itself was
    wrong. Single-nozzle firmware returned result:"fail" with
    reason:"invalid tray_id" on writes that demonstrably applied.
    Measured against an X1C and an H2D over MQTT, the cause is the
    tray_id:-1 Bambuddy itself put in the payload. Sending three
    otherwise identical writes isolated it: tray_id:-1 fails, tray_id:0
    succeeds, and cali_idx:-1 is accepted either way, so only that one
    field is at fault. The H2D ignores the value entirely; the X1C
    validates it, complains, and applies the write anyway. BambuStudio
    always sends a real tray_id and defaults it to 0 for a manually
    entered profile.

    With tray_id:0 the acknowledgement is honest, and the printer echoes
    back the sequence_id we sent -- confirmed for extrusion_cali_get,
    _set and _del on both printer classes -- so it can be matched to the
    write that caused it. Writes now return their sequence_id and the
    routes await the verdict, turning a real failure into an error that
    carries the printer's own reason. A printer that stays silent is
    still treated as success: no answer is not evidence of refusal, and
    firmware that never answers must not turn every save into an error.

    Raises the ack to INFO. It sat at DEBUG, so the one line that
    explains a failed save was absent from every support bundle -- the
    same reasoning that put ams_filament_drying at INFO for #1447.

    Also fixes extrusion_cali_set building its payload from
    str(self._sequence_id) without incrementing first, reusing the
    previous command's id. Harmless while nothing correlated on it,
    fatal now that the write path does.

    Adds supports_nozzle_flow_type() for the Standard / High Flow choice,
    which the K-Profiles UI previously showed as "Not reported by
    printer" -- not a value anyone can save. Most printers omit the
    nozzle identity from their calibration table entirely, and the slicer
    treats that as Standard rather than unknown; Bambuddy now does the
    same and keeps the choice editable. The field is hidden only where
    the model ships a single nozzle variant, using the slicer's own rule
    (len(nozzle_volume) // len(nozzle_diameter) > 1 over the machine
    preset) evaluated across every bundled Bambu profile. That puts only
    A1, A1 Mini and A2L on the hidden side -- it is not the single-
    versus-dual-nozzle split, since P1P, P1S, P2S, X1, X1C, X1E and H2S
    are all single-nozzle and all carry two variants. Editing a profile
    also no longer writes back an empty nozzle_id.

    Wiki records that on printers which omit the field the chosen flow
    type is discarded by the firmware and reads back as Standard, in
    Bambu Studio as well, so it does not get filed as a bug again.

frontend/src/api/client.ts

@@ -357,6 +357,10 @@ export interface Printer {
   model: string | null;
   location: string | null;  // Group/location name
   nozzle_count: number;  // 1 or 2, auto-detected from MQTT
+  // Model is sold with both Standard and High Flow nozzles, so a K-profile's
+  // flow type is a real choice. Derived from the model, not the nozzle count —
+  // only the A-series has a single variant.
+  supports_nozzle_flow_type: boolean;
   is_active: boolean;
   auto_archive: boolean;
   external_camera_url: string | null;

frontend/src/components/KProfilesView.tsx

@@ -49,23 +49,26 @@ const truncateK = (value: string) => {
   return (Math.trunc(num * 1000) / 1000).toFixed(3);
 };
 
-// Get flow type label from nozzle_id (e.g., "HH00-0.4" -> "HF", "HS00-0.4" -> "S").
-// Single-nozzle printers omit nozzle_id from their extrusion_cali_get response
-// entirely (#1748), and there is no other field to recover the flow type from —
-// so return '' and let the caller show nothing rather than assert "Standard".
-const getFlowTypeLabel = (nozzleId: string) => {
-  if (nozzleId.startsWith('HH')) return 'HF';  // High Flow
-  if (nozzleId.startsWith('HS')) return 'S';   // Standard Flow
-  return '';  // not reported by the printer
-};
+// nozzle_id encodes the flow type, per the slicer's own generator:
+//   "H" + (Standard ? "S" : "H") + "00" + "-" + diameter
+// so "HS00-0.4" is Standard and "HH00-0.4" is High Flow. The "00" is a literal,
+// not a material code.
+const STANDARD_FLOW = 'HS00';
+const HIGH_FLOW = 'HH00';
 
-// Extract nozzle type prefix from nozzle_id (e.g., "HH00-0.4" -> "HH00").
-// '' when the printer reported no nozzle_id — see getFlowTypeLabel.
+// Many printers omit nozzle_id from their extrusion_cali_get response entirely
+// (#1748) — the field simply isn't in the payload. BambuStudio treats that as
+// Standard (its parser falls back to nvtStandard when the key is absent), and
+// so do we: the flow type stays a real, editable value rather than a blank.
 const getNozzleTypePrefix = (nozzleId: string) => {
   const match = nozzleId.match(/^([A-Z]{2}\d{2})/);
-  return match ? match[1] : '';
+  return match ? match[1] : STANDARD_FLOW;
 };
 
+// Short label for the profile list.
+const getFlowTypeLabel = (nozzleId: string) =>
+  getNozzleTypePrefix(nozzleId) === HIGH_FLOW ? 'HF' : 'S';
+
 // Extract filament name from profile name (e.g., "High Flow_Devil Design PLA Basic" -> "Devil Design PLA Basic")
 const extractFilamentName = (profileName: string) => {
   // Profile names are formatted as "{Flow Type}_{Filament Name}" or "{Flow Type} {Filament Name}"
@@ -132,7 +135,7 @@ function KProfileCard({ profile, onEdit, onCopy, selectionMode, isSelected, onTo
             </span>
           )}
           <span className="text-xs text-bambu-gray whitespace-nowrap">
-            {[flowType, diameter].filter(Boolean).join(' ')}
+            {flowType} {diameter}
           </span>
         </div>
         {note && (
@@ -165,6 +168,7 @@ interface KProfileModalProps {
   builtinFilaments?: { filament_id: string; name: string }[];  // Filament ID → name lookup
   filamentPresets?: FilamentPresetOption[];  // Every filament this install knows, tiered
   isDualNozzle?: boolean;  // Whether this is a dual-nozzle printer
+  supportsFlowType?: boolean;  // Model sells both Standard and High Flow nozzles
   initialNote?: string;  // Initial note value for the profile
   initialNoteKey?: string | null;  // Key the note was stored under (for clearing)
   onClose: () => void;
@@ -181,6 +185,7 @@ function KProfileModal({
   builtinFilaments = [],
   filamentPresets = [],
   isDualNozzle = false,
+  supportsFlowType = true,
   initialNote = '',
   initialNoteKey = null,
   onClose,
@@ -207,7 +212,7 @@ function KProfileModal({
   // single-nozzle models never do (#1748) — showing "High Flow" there was the
   // UI inventing a value the printer never sent.
   const [nozzleType, setNozzleType] = useState(
-    profile ? getNozzleTypePrefix(profile.nozzle_id) : 'HH00'
+    profile ? getNozzleTypePrefix(profile.nozzle_id) : STANDARD_FLOW
   );
   const [modalDiameter, setModalDiameter] = useState(
     profile?.nozzle_diameter || nozzleDiameter
@@ -351,11 +356,14 @@ function KProfileModal({
     const nozzleId = `${nozzleType}-${modalDiameter}`;
 
     // An edit is delete + re-add on single-nozzle printers, so the nozzle
-    // fields have to survive the round trip untouched — both selects are
-    // disabled while editing. Rebuilding them from the selects is what let a
-    // 0.6mm profile come back as "HH00-0.4" once the parse defaults had
-    // stamped it 0.4 (#1748); pass through what the printer reported instead.
-    const editNozzleId = profile ? profile.nozzle_id : nozzleId;
+    // fields have to survive the round trip — both selects are disabled while
+    // editing. Rebuilding them blindly from the selects is what let a 0.6mm
+    // profile come back as "HH00-0.4" once the parse defaults had stamped it
+    // 0.4 (#1748), so prefer whatever the printer reported. Where it reported
+    // no nozzle_id at all, send the rebuilt one rather than an empty string —
+    // the field is part of the profile's identity on the wire and the slicer
+    // always populates it.
+    const editNozzleId = profile ? profile.nozzle_id || nozzleId : nozzleId;
     const editDiameter = profile ? profile.nozzle_diameter : modalDiameter;
 
     // The printer indexes its calibration table by filament_id, so the preset
@@ -562,7 +570,7 @@ function KProfileModal({
                               // Auto-generate the profile name, but never over
                               // an entry the user typed.
                               if (!name) {
-                                const flowLabel = nozzleType === 'HH00' ? 'HF' : 'S';
+                                const flowLabel = nozzleType === HIGH_FLOW ? 'HF' : 'S';
                                 setName(`${flowLabel} ${f.name}`);
                               }
                             }}
@@ -582,9 +590,12 @@ function KProfileModal({
               )}
             </div>
 
-            {/* Flow Type and Nozzle Size - read-only when editing */}
-            <div className="grid grid-cols-2 gap-4">
-              <div>
+            {/* Flow Type and Nozzle Size - read-only when editing. Flow type
+                is hidden on models sold with a single nozzle variant (the
+                A-series), where the choice would be meaningless — same gate
+                the slicer applies via support_nozzle_volume(). */}
+            <div className={supportsFlowType ? 'grid grid-cols-2 gap-4' : ''}>
+              <div className={supportsFlowType ? '' : 'hidden'}>
                 <label className="block text-sm text-bambu-gray mb-1">{t('kProfiles.modal.flowType')}</label>
                 <select
                   value={nozzleType}
@@ -596,7 +607,7 @@ function KProfileModal({
                     if (!profile && filamentChoice && !name) {
                       const selectedFilament = filamentPresets.find(f => f.id === filamentChoice);
                       if (selectedFilament) {
-                        const flowLabel = newNozzleType === 'HH00' ? 'HF' : 'S';
+                        const flowLabel = newNozzleType === HIGH_FLOW ? 'HF' : 'S';
                         setName(`${flowLabel} ${selectedFilament.name}`);
                       }
                     }
@@ -604,14 +615,8 @@ function KProfileModal({
                   disabled={!!profile}
                   className={`w-full px-3 py-2 bg-bambu-dark border border-bambu-dark-tertiary rounded-lg text-white focus:border-bambu-green focus:outline-none ${profile ? 'opacity-60 cursor-not-allowed' : ''}`}
                 >
-                  {/* Only reachable when editing a profile the printer
-                      reported without a nozzle_id — the select is disabled
-                      there, so this is a readout, not a choice. */}
-                  {nozzleType === '' && (
-                    <option value="">{t('kProfiles.modal.flowTypeNotReported')}</option>
-                  )}
-                  <option value="HH00">{t('kProfiles.modal.highFlow')}</option>
-                  <option value="HS00">{t('kProfiles.modal.standard')}</option>
+                  <option value={HIGH_FLOW}>{t('kProfiles.modal.highFlow')}</option>
+                  <option value={STANDARD_FLOW}>{t('kProfiles.modal.standard')}</option>
                 </select>
               </div>
               <div>
@@ -993,21 +998,6 @@ export function KProfilesView() {
     return builtinFilamentMap.get(profile.filament_id) || extractFilamentName(profile.name);
   }, [builtinFilamentMap]);
 
-  // Whether the printer reports a nozzle_id at all. Single-nozzle models omit
-  // it from every extrusion_cali_get entry (#1748), so a flow-type filter there
-  // could only ever match nothing — hide it instead of offering a control that
-  // silently empties the list.
-  const hasFlowTypeInfo = React.useMemo(
-    () => (kprofiles?.profiles ?? []).some((p) => getFlowTypeLabel(p.nozzle_id) !== ''),
-    [kprofiles?.profiles]
-  );
-
-  // Don't strand the list behind a filter whose control just disappeared
-  // (switching printers, or a refetch that no longer carries nozzle ids).
-  useEffect(() => {
-    if (!hasFlowTypeInfo) setFlowTypeFilter('all');
-  }, [hasFlowTypeInfo]);
-
   // Filter and sort profiles
   // Note: nozzle diameter filtering is done server-side via MQTT request
   const filteredProfiles = React.useMemo(() => {
@@ -1054,6 +1044,18 @@ export function KProfilesView() {
   const selectedPrinterData = printers?.find((p) => p.id === selectedPrinter);
   const isDualNozzle = selectedPrinterData?.nozzle_count === 2;
 
+  // Whether this printer model is sold with both Standard and High Flow
+  // nozzles. Comes from the model, not from whether the payload happened to
+  // carry a nozzle_id — most printers omit that field entirely (#1748) while
+  // still offering both flows. Only the A-series has a single variant.
+  const supportsFlowType = selectedPrinterData?.supports_nozzle_flow_type ?? true;
+
+  // Don't strand the list behind a filter whose control just disappeared.
+  useEffect(() => {
+    if (!supportsFlowType) setFlowTypeFilter('all');
+  }, [supportsFlowType]);
+
+
   // Keyboard shortcuts
   useEffect(() => {
     const handleKeyDown = (e: KeyboardEvent) => {
@@ -1145,10 +1147,10 @@ export function KProfilesView() {
               name: p.name,
               k_value: parseFloat(p.k_value).toFixed(6),
               filament_id: p.filament_id,
-              // Keep an absent nozzle_id absent. Exports from single-nozzle
-              // printers carry none (#1748), and HH00 vs HS00 is a coin flip
-              // we'd be writing to the printer as if it were fact.
-              nozzle_id: p.nozzle_id || '',
+              // An export from a printer that reports no nozzle_id carries
+              // none; fall back to Standard, the same default the slicer's
+              // parser uses for a missing field.
+              nozzle_id: p.nozzle_id || `${STANDARD_FLOW}-${nozzleDiameter}`,
               nozzle_diameter: p.nozzle_diameter || nozzleDiameter,
               extruder_id: p.extruder_id ?? 0,
               slot_id: 0, // Always create new
@@ -1394,7 +1396,7 @@ export function KProfilesView() {
             </select>
           </div>
         )}
-        {hasFlowTypeInfo && (
+        {supportsFlowType && (
           <div className="w-32">
             <select
               value={flowTypeFilter}
@@ -1603,6 +1605,7 @@ export function KProfilesView() {
             builtinFilaments={enrichedBuiltinFilaments}
             filamentPresets={filamentPresets}
             isDualNozzle={isDualNozzle}
+            supportsFlowType={supportsFlowType}
             initialNote={note}
             initialNoteKey={key}
             onSaveNote={handleSaveNote}
@@ -1629,6 +1632,7 @@ export function KProfilesView() {
           builtinFilaments={enrichedBuiltinFilaments}
           filamentPresets={filamentPresets}
           isDualNozzle={isDualNozzle}
+          supportsFlowType={supportsFlowType}
           onSaveNote={handleSaveNote}
           hasPermission={hasPermission}
           onClose={() => {
@@ -1651,6 +1655,7 @@ export function KProfilesView() {
           builtinFilaments={enrichedBuiltinFilaments}
           filamentPresets={filamentPresets}
           isDualNozzle={isDualNozzle}
+          supportsFlowType={supportsFlowType}
           onSaveNote={handleSaveNote}
           hasPermission={hasPermission}
           // Pass profile data but without slot_id to create a new profile

frontend/src/i18n/locales/de.ts

@@ -5046,7 +5046,6 @@ export default {
       flowType: 'Flusstyp',
       highFlow: 'Hoher Durchfluss',
       standard: 'Standard',
-      flowTypeNotReported: 'Vom Drucker nicht gemeldet',
       nozzleSize: 'Düsengröße',
       extruder: 'Extruder',
       extruders: 'Extruder',

frontend/src/i18n/locales/en.ts

@@ -5090,7 +5090,6 @@ export default {
       flowType: 'Flow Type',
       highFlow: 'High Flow',
       standard: 'Standard',
-      flowTypeNotReported: 'Not reported by printer',
       nozzleSize: 'Nozzle Size',
       extruder: 'Extruder',
       extruders: 'Extruders',

frontend/src/i18n/locales/es.ts

@@ -5055,7 +5055,6 @@ export default {
       flowType: 'Tipo de flujo',
       highFlow: 'Flujo alto',
       standard: 'Estándar',
-      flowTypeNotReported: 'No informado por la impresora',
       nozzleSize: 'Tamaño de la boquilla',
       extruder: 'Extrusor',
       extruders: 'Extrusores',

frontend/src/i18n/locales/fr.ts

@@ -5036,7 +5036,6 @@ export default {
       flowType: 'Type de débit',
       highFlow: 'Haut Débit (HF)',
       standard: 'Standard',
-      flowTypeNotReported: 'Non communiqué par l\'imprimante',
       nozzleSize: 'Taille buse',
       extruder: 'Extrudeur',
       extruders: 'Extrudeurs',

frontend/src/i18n/locales/it.ts

@@ -5035,7 +5035,6 @@ export default {
       flowType: 'Tipo flow',
       highFlow: 'Alto flusso',
       standard: 'Standard',
-      flowTypeNotReported: 'Non riportato dalla stampante',
       nozzleSize: 'Dimensione ugello',
       extruder: 'Estrusore',
       extruders: 'Estrusori',

frontend/src/i18n/locales/ja.ts

@@ -5047,7 +5047,6 @@ export default {
       flowType: 'フロータイプ',
       highFlow: 'ハイフロー',
       standard: 'スタンダード',
-      flowTypeNotReported: 'プリンターから報告なし',
       nozzleSize: 'ノズルサイズ',
       extruder: 'エクストルーダー',
       extruders: 'エクストルーダー',

frontend/src/i18n/locales/ko.ts

@@ -4790,7 +4790,6 @@ export default {
       flowType: '유량 유형',
       highFlow: '고유량',
       standard: '표준',
-      flowTypeNotReported: '프린터에서 보고하지 않음',
       nozzleSize: '노즐 크기',
       extruder: '압출기',
       extruders: '압출기',

frontend/src/i18n/locales/pt-BR.ts

@@ -5035,7 +5035,6 @@ export default {
       flowType: 'Tipo de Fluxo',
       highFlow: 'Alto Fluxo',
       standard: 'Padrão',
-      flowTypeNotReported: 'Não informado pela impressora',
       nozzleSize: 'Tamanho do Bico',
       extruder: 'Extrusor',
       extruders: 'Extrusores',

frontend/src/i18n/locales/ru.ts

@@ -4778,7 +4778,6 @@ export default {
       flowType: "Тип потока",
       highFlow: "Высокопоточный",
       standard: "Стандартный",
-      flowTypeNotReported: "Принтер не сообщает",
       nozzleSize: "Диаметр сопла",
       extruder: "Экструдер",
       extruders: "Экструдеры",

frontend/src/i18n/locales/tr.ts

@@ -5015,7 +5015,6 @@ export default {
       flowType: 'Akış Türü',
       highFlow: 'Yüksek Akış',
       standard: 'Standart',
-      flowTypeNotReported: 'Yazıcı tarafından bildirilmedi',
       nozzleSize: 'Nozul Boyutu',
       extruder: 'Ekstrüder',
       extruders: 'Ekstrüderler',

frontend/src/i18n/locales/uk.ts

@@ -5090,7 +5090,6 @@ export default {
       flowType: "Тип потоку",
       highFlow: "Сопло з високим потоком",
       standard: "Стандартний",
-      flowTypeNotReported: "Принтер не повідомляє",
       nozzleSize: "Розмір сопла",
       extruder: "Екструдер",
       extruders: "Екструдери",

frontend/src/i18n/locales/zh-CN.ts

@@ -5035,7 +5035,6 @@ export default {
       flowType: '流量类型',
       highFlow: '高流量',
       standard: '标准',
-      flowTypeNotReported: '打印机未报告',
       nozzleSize: '喷嘴尺寸',
       extruder: '挤出机',
       extruders: '挤出机',

frontend/src/i18n/locales/zh-TW.ts

@@ -5035,7 +5035,6 @@ export default {
       flowType: '流量類型',
       highFlow: '高流量',
       standard: '標準',
-      flowTypeNotReported: '印表機未回報',
       nozzleSize: '噴嘴尺寸',
       extruder: '擠出機',
       extruders: '擠出機',