Release 2026-04-14 spool and filament workflow

src/app.h

@@ -30,6 +30,7 @@ constexpr uint32_t kWifiConnectTimeoutMs = 20000;
 constexpr uint32_t kSensorTimeoutMs = 1500;
 constexpr uint8_t kAverageSamples = 16;
 constexpr uint8_t kRawFilterWindow = 8;
+constexpr uint8_t kBatchCodeMaxLength = 4;
 constexpr float kRawFilterAlpha = 0.20f;
 constexpr float kWeightStepHysteresisGrams = 0.75f;
 constexpr lv_coord_t kScreenMargin = 12;
@@ -71,10 +72,12 @@ struct WifiData
 struct InventreeMatch
 {
     int id = 0;
+    int part_id = 0;
     float quantity = 0.0f;
     String location;
     String part_name;
     String batch;
+    String spool_weight;
 };
 
 constexpr size_t kInventreeMaxMatches = 8;
@@ -109,6 +112,8 @@ struct UiRefs
     lv_obj_t *weight_note_label = nullptr;
     lv_obj_t *weight_raw_value = nullptr;
     lv_obj_t *workflow_batch_ta = nullptr;
+    lv_obj_t *workflow_spool_weight_value = nullptr;
+    lv_obj_t *workflow_filament_weight_value = nullptr;
     lv_obj_t *workflow_stock_name_label = nullptr;
     lv_obj_t *workflow_stock_meta_label = nullptr;
 
@@ -173,6 +178,7 @@ void saveInventreeConfig();
 void loadInventreeConfig();
 
 float getCurrentWeightGrams();
+bool getFilamentWeightGrams(int32_t &grams);
 void performTare();
 void performCalibration(float reference_grams);
 void clearCalibration();

src/connectivity.cpp

@@ -4,6 +4,7 @@
 #include <HTTPClient.h>
 #include <WiFiClient.h>
 #include <WiFiClientSecure.h>
+#include <ctype.h>
 #include <math.h>
 #include <stdio.h>
 #include <string.h>
@@ -11,6 +12,13 @@
 namespace
 {
 
+bool performInventreeRequest(const char *method,
+                             const String &path,
+                             const String &request_body,
+                             int &http_code,
+                             String &response_body,
+                             String &error_text);
+
 String normalizeInventreeBaseUrl(const String &value)
 {
     String base_url = value;
@@ -50,6 +58,165 @@ String urlEncode(const String &value)
     return encoded;
 }
 
+void sanitizeBatchCode(String &value)
+{
+    value.trim();
+
+    if (value.length() > kBatchCodeMaxLength)
+    {
+        value.remove(kBatchCodeMaxLength);
+    }
+}
+
+String formatSpoolWeightValue(const String &value_text)
+{
+    String value = value_text;
+    value.trim();
+    return value;
+}
+
+String normalizeParameterKey(const String &value)
+{
+    String normalized;
+    normalized.reserve(value.length());
+
+    for (size_t i = 0; i < value.length(); ++i)
+    {
+        const unsigned char ch = static_cast<unsigned char>(value[i]);
+        if (isalnum(ch))
+        {
+            normalized += static_cast<char>(tolower(ch));
+        }
+    }
+
+    return normalized;
+}
+
+bool isSpoolWeightParameterName(const String &parameter_name)
+{
+    const String normalized_name = normalizeParameterKey(parameter_name);
+    return normalized_name == "spoolwegh" || normalized_name == "spoolweght" || normalized_name == "spoolweight";
+}
+
+String extractSpoolWeightFromPartDetail(JsonVariantConst part_detail)
+{
+    JsonVariantConst parameters_map = part_detail["parameters_map"];
+
+    if (parameters_map.isNull())
+    {
+        return "";
+    }
+
+    const char *const spool_weight =
+        parameters_map["SpoolWegh"] |
+        parameters_map["SpoolWeght"] |
+        parameters_map["SpoolWeight"] |
+        parameters_map["spool_weight"] |
+        parameters_map["spoolwegh"] |
+        parameters_map["spoolweght"];
+
+    return spool_weight != nullptr ? formatSpoolWeightValue(String(spool_weight)) : String();
+}
+
+String formatInventreeParameterValue(JsonObjectConst parameter)
+{
+    String value = String(static_cast<const char *>(parameter["data"] | ""));
+    value.trim();
+
+    if (value.isEmpty())
+    {
+        const JsonVariantConst numeric_value = parameter["data_numeric"];
+        if (!numeric_value.isNull())
+        {
+            const float number = numeric_value.as<float>();
+            const bool whole_number = fabsf(number - roundf(number)) < 0.05f;
+            value = String(number, whole_number ? 0 : 1);
+        }
+    }
+
+    String units = String(static_cast<const char *>(parameter["template_detail"]["units"] | ""));
+    units.trim();
+
+    if (!value.isEmpty() && !units.isEmpty())
+    {
+        String normalized_value = value;
+        normalized_value.toLowerCase();
+        String normalized_units = units;
+        normalized_units.toLowerCase();
+
+        if (!normalized_value.endsWith(normalized_units))
+        {
+            value += " ";
+            value += units;
+        }
+    }
+
+    return value;
+}
+
+String extractSpoolWeightFromParameters(JsonArrayConst parameters)
+{
+    for (JsonObjectConst parameter : parameters)
+    {
+        const String parameter_name = String(static_cast<const char *>(parameter["template_detail"]["name"] | ""));
+        if (isSpoolWeightParameterName(parameter_name))
+        {
+            return formatInventreeParameterValue(parameter);
+        }
+    }
+
+    return "";
+}
+
+bool tryParseSpoolWeightGrams(int32_t &grams)
+{
+    grams = 0;
+
+    if (inventree_data.selected_match < 0 || inventree_data.selected_match >= inventree_data.stored_matches)
+    {
+        return false;
+    }
+
+    const String &spool_weight = inventree_data.matches[inventree_data.selected_match].spool_weight;
+    if (spool_weight.isEmpty())
+    {
+        return false;
+    }
+
+    bool has_digit = false;
+    for (size_t i = 0; i < spool_weight.length(); ++i)
+    {
+        if (isdigit(static_cast<unsigned char>(spool_weight[i])))
+        {
+            has_digit = true;
+            break;
+        }
+    }
+
+    if (!has_digit)
+    {
+        return false;
+    }
+
+    const float parsed_value = spool_weight.toFloat();
+    grams = parsed_value <= 0.0f ? 0 : static_cast<int32_t>(lroundf(parsed_value));
+    return true;
+}
+
+bool tryGetMeasuredWeightGrams(int32_t &grams)
+{
+    grams = 0;
+
+    if (!sensor_online || !calibration.has_offset || calibration.scale <= 0.0001f)
+    {
+        return false;
+    }
+
+    const int32_t stable_grams = displayed_weight_valid ? displayed_weight_grams : static_cast<int32_t>(lroundf(getCurrentWeightGrams()));
+    grams = stable_grams < 0 ? 0 : stable_grams;
+    return true;
+}
+
 void syncInventreeInputs(bool persist)
 {
     inventree_data.base_url = ui.inventree_url_ta != nullptr
@@ -77,7 +244,16 @@ void syncInventreeInputs(bool persist)
     inventree_data.batch = batch_input != nullptr
                                ? String(lv_textarea_get_text(batch_input))
                                : inventree_data.batch;
-    inventree_data.batch.trim();
+    sanitizeBatchCode(inventree_data.batch);
+
+    if (batch_input != nullptr)
+    {
+        const String current_batch_text = String(lv_textarea_get_text(batch_input));
+        if (current_batch_text != inventree_data.batch)
+        {
+            lv_textarea_set_text(batch_input, inventree_data.batch.c_str());
+        }
+    }
 
     if (ui.workflow_batch_ta != nullptr && batch_input != ui.workflow_batch_ta)
     {
@@ -144,6 +320,12 @@ void updateInventreeSelectionSummary()
         }
     }
 
+    if (!match.spool_weight.isEmpty())
+    {
+        text += "\nSpool ";
+        text += match.spool_weight;
+    }
+
     inventree_data.result_text = text;
     updateInventreeLabels();
 }
@@ -229,6 +411,61 @@ bool performInventreeHttpRequest(TClient &client,
     return http_code > 0;
 }
 
+bool loadSpoolWeightForMatch(InventreeMatch &match, String &error_text)
+{
+    error_text = "";
+
+    if (!match.spool_weight.isEmpty() || match.part_id <= 0)
+    {
+        return true;
+    }
+
+    int http_code = 0;
+    String response_body;
+    const String path = "/api/part/" + String(match.part_id) + "/?parameters=true";
+
+    if (!performInventreeRequest("GET", path, "", http_code, response_body, error_text))
+    {
+        return false;
+    }
+
+    if (http_code != 200)
+    {
+        error_text = response_body.length() > 0 ? response_body : "Unexpected part response.";
+        return false;
+    }
+
+    JsonDocument filter;
+    filter["parameters_map"]["SpoolWegh"] = true;
+    filter["parameters_map"]["SpoolWeght"] = true;
+    filter["parameters_map"]["SpoolWeight"] = true;
+    filter["parameters_map"]["spool_weight"] = true;
+    filter["parameters_map"]["spoolwegh"] = true;
+    filter["parameters_map"]["spoolweght"] = true;
+    JsonArray parameters_filter = filter["parameters"].to<JsonArray>();
+    JsonObject parameter_filter = parameters_filter.add<JsonObject>();
+    parameter_filter["data"] = true;
+    parameter_filter["data_numeric"] = true;
+    parameter_filter["template_detail"]["name"] = true;
+    parameter_filter["template_detail"]["units"] = true;
+
+    JsonDocument doc;
+    const DeserializationError json_error = deserializeJson(doc, response_body, DeserializationOption::Filter(filter));
+    if (json_error)
+    {
+        error_text = json_error.c_str();
+        return false;
+    }
+
+    match.spool_weight = extractSpoolWeightFromPartDetail(doc.as<JsonVariantConst>());
+    if (match.spool_weight.isEmpty())
+    {
+        match.spool_weight = extractSpoolWeightFromParameters(doc["parameters"].as<JsonArrayConst>());
+    }
+
+    return true;
+}
+
 bool requestInventreeToken(String &error_text)
 {
     error_text = "";
@@ -378,18 +615,43 @@ bool getMeasuredWeightForInventree(String &quantity_text)
 {
     quantity_text = "";
 
-    if (!sensor_online || !calibration.has_offset || calibration.scale <= 0.0001f)
+    int32_t filament_grams = 0;
+    if (!getFilamentWeightGrams(filament_grams))
     {
         return false;
     }
 
-    const int32_t stable_grams = displayed_weight_valid ? displayed_weight_grams : static_cast<int32_t>(lroundf(getCurrentWeightGrams()));
+    quantity_text = String(filament_grams);
-    quantity_text = String(stable_grams < 0 ? 0 : stable_grams);
     return true;
 }
 
 } // namespace
 
+bool getFilamentWeightGrams(int32_t &grams)
+{
+    grams = 0;
+
+    int32_t measured_grams = 0;
+    if (!tryGetMeasuredWeightGrams(measured_grams))
+    {
+        return false;
+    }
+
+    int32_t spool_grams = 0;
+    if (!tryParseSpoolWeightGrams(spool_grams))
+    {
+        return false;
+    }
+
+    grams = measured_grams - spool_grams;
+    if (grams < 0)
+    {
+        grams = 0;
+    }
+
+    return true;
+}
+
 void saveWifiConfig()
 {
     prefs.putString("wifi_ssid", wifi_data.ssid);
@@ -424,7 +686,21 @@ void loadInventreeConfig()
     }
 
     inventree_data.token = prefs.getString("inv_tok", "");
-    inventree_data.batch = prefs.getString("inv_batch", prefs.getString("inv_ipn", ""));
+
+    if (prefs.isKey("inv_batch"))
+    {
+        inventree_data.batch = prefs.getString("inv_batch", "");
+    }
+    else if (prefs.isKey("inv_ipn"))
+    {
+        inventree_data.batch = prefs.getString("inv_ipn", "");
+    }
+    else
+    {
+        inventree_data.batch = "";
+    }
+
+    sanitizeBatchCode(inventree_data.batch);
 }
 
 bool inventreeConfigured()
@@ -437,6 +713,11 @@ void clearInventreeMatches()
     inventree_data.total_matches = 0;
     inventree_data.stored_matches = 0;
     inventree_data.selected_match = -1;
+
+    for (size_t i = 0; i < kInventreeMaxMatches; ++i)
+    {
+        inventree_data.matches[i] = InventreeMatch();
+    }
 }
 
 void connectWifi(const String &ssid, const String &password, bool save_credentials)
@@ -650,12 +931,19 @@ void findInventreeStockByBatch()
     JsonArray filter_results = filter["results"].to<JsonArray>();
     JsonObject filter_item = filter_results.add<JsonObject>();
     filter_item["pk"] = true;
+    filter_item["part"] = true;
     filter_item["batch"] = true;
     filter_item["quantity"] = true;
     filter_item["location"] = true;
     filter_item["location_detail"]["pathstring"] = true;
     filter_item["location_detail"]["name"] = true;
     filter_item["part_detail"]["name"] = true;
+    filter_item["part_detail"]["parameters_map"]["SpoolWegh"] = true;
+    filter_item["part_detail"]["parameters_map"]["SpoolWeght"] = true;
+    filter_item["part_detail"]["parameters_map"]["SpoolWeight"] = true;
+    filter_item["part_detail"]["parameters_map"]["spool_weight"] = true;
+    filter_item["part_detail"]["parameters_map"]["spoolwegh"] = true;
+    filter_item["part_detail"]["parameters_map"]["spoolweght"] = true;
 
     JsonDocument doc;
     const DeserializationError json_error = deserializeJson(doc, response, DeserializationOption::Filter(filter));
@@ -680,10 +968,13 @@ void findInventreeStockByBatch()
         }
 
         InventreeMatch &match = inventree_data.matches[inventree_data.stored_matches];
+        match = InventreeMatch();
         match.id = item["pk"] | 0;
+        match.part_id = item["part"] | 0;
         match.quantity = item["quantity"] | 0.0f;
         match.batch = String(static_cast<const char *>(item["batch"] | ""));
         match.part_name = String(static_cast<const char *>(item["part_detail"]["name"] | ""));
+        match.spool_weight = extractSpoolWeightFromPartDetail(item["part_detail"]);
 
         const char *pathstring = item["location_detail"]["pathstring"] | nullptr;
         const char *name = item["location_detail"]["name"] | nullptr;
@@ -713,6 +1004,22 @@ void findInventreeStockByBatch()
     }
 
     inventree_data.selected_match = 0;
+    if (inventree_data.selected_match < inventree_data.stored_matches)
+    {
+        String spool_error;
+        if (!loadSpoolWeightForMatch(inventree_data.matches[inventree_data.selected_match], spool_error))
+        {
+            Serial.printf("InvenTree spool weight fallback failed for part %d: %s\n",
+                          inventree_data.matches[inventree_data.selected_match].part_id,
+                          spool_error.c_str());
+        }
+        else
+        {
+            Serial.printf("InvenTree spool weight for part %d: %s\n",
+                          inventree_data.matches[inventree_data.selected_match].part_id,
+                          inventree_data.matches[inventree_data.selected_match].spool_weight.c_str());
+        }
+    }
     inventree_data.status_text = "Found " + String(inventree_data.total_matches) + " item(s)";
     setInventreeNote(inventree_data.total_matches > inventree_data.stored_matches
                          ? "More items exist than shown here. Use the first loaded results."
@@ -738,6 +1045,20 @@ void selectInventreeMatch(int delta)
         inventree_data.selected_match = 0;
     }
 
+    String spool_error;
+    if (!loadSpoolWeightForMatch(inventree_data.matches[inventree_data.selected_match], spool_error))
+    {
+        Serial.printf("InvenTree spool weight fallback failed for part %d: %s\n",
+                      inventree_data.matches[inventree_data.selected_match].part_id,
+                      spool_error.c_str());
+    }
+    else
+    {
+        Serial.printf("InvenTree spool weight for part %d: %s\n",
+                      inventree_data.matches[inventree_data.selected_match].part_id,
+                      inventree_data.matches[inventree_data.selected_match].spool_weight.c_str());
+    }
+
     updateInventreeSelectionSummary();
 }
 
@@ -754,7 +1075,7 @@ void pushMeasuredWeightToInventree()
     String quantity_text;
     if (!getMeasuredWeightForInventree(quantity_text))
     {
-        setInventreeNote("Weight is not ready. Calibrate HX711 in grams first.");
+        setInventreeNote("Filament Weight is not ready. Check calibration and Spool Weight.");
         return;
     }
 
@@ -763,7 +1084,7 @@ void pushMeasuredWeightToInventree()
     JsonObject item = items.add<JsonObject>();
     item["pk"] = inventree_data.matches[inventree_data.selected_match].id;
     item["quantity"] = quantity_text;
-    body_doc["notes"] = "Updated from FilamentGauger sensor";
+    body_doc["notes"] = "Updated net filament weight from FilamentGauger sensor";
 
     String request_body;
     serializeJson(body_doc, request_body);
@@ -776,7 +1097,7 @@ void pushMeasuredWeightToInventree()
     {
         inventree_data.status_text = "Update error";
         inventree_data.result_text = error_text;
-        setInventreeNote("Could not submit measured weight to InvenTree.");
+        setInventreeNote("Could not submit Filament Weight to InvenTree.");
         updateInventreeLabels();
         return;
     }
@@ -785,17 +1106,17 @@ void pushMeasuredWeightToInventree()
     {
         inventree_data.status_text = "HTTP " + String(http_code);
         inventree_data.result_text = response.length() > 0 ? response : "Unexpected API response.";
-        setInventreeNote("Stock count update failed.");
+        setInventreeNote("Filament Weight update failed.");
         updateInventreeLabels();
         return;
     }
 
     inventree_data.status_text = "Stock updated";
-    inventree_data.result_text = "Sent " + quantity_text + " g to stock item ID " +
+    inventree_data.result_text = "Sent filament " + quantity_text + " g to stock item ID " +
                                  String(inventree_data.matches[inventree_data.selected_match].id);
-    setInventreeNote("Measured weight was written to InvenTree stock quantity.");
+    setInventreeNote("Filament Weight was written to InvenTree stock quantity.");
     updateInventreeLabels();
 
     findInventreeStockByBatch();
-    setInventreeNote("Measured weight was written to InvenTree stock quantity.");
+    setInventreeNote("Filament Weight was written to InvenTree stock quantity.");
 }

src/main.cpp

@@ -4,6 +4,7 @@ namespace
 {
 
 String serial_line;
+constexpr lv_display_rotation_t kDisplayRotation = LV_DISPLAY_ROTATION_180;
 
 void handleSerialCommand(const String &command)
 {
@@ -112,11 +113,17 @@ void setup()
 
     hx711.begin(HX711_DOUT_PIN, HX711_SCK_PIN);
 
+    log_i("Initializing smart display...");
     smartdisplay_init();
-    auto *display = lv_disp_get_default();
+    lv_display_t *display = lv_display_get_default();
-    lv_display_set_rotation(display, LV_DISPLAY_ROTATION_180);
+    if (display != nullptr)
+    {
+        lv_display_set_rotation(display, kDisplayRotation);
+    }
 
+    log_i("Building UI...");
     buildUi();
+    log_i("UI ready.");
     lv_tick_inc(1);
     lv_timer_handler();
     delay(20);
@@ -134,6 +141,7 @@ void setup()
     next_ui_refresh_ms = millis();
 
     log_i("HX711 pins: SCK=%d DOUT=%d", HX711_SCK_PIN, HX711_DOUT_PIN);
+    log_i("Setup complete.");
 }
 
 void loop()

src/ui.cpp

@@ -214,6 +214,7 @@ void openTextEditor(lv_obj_t *target, const char *title)
     setLabelTextIfChanged(ui.text_editor_title, title != nullptr ? title : "Edit");
     lv_textarea_set_password_mode(ui.text_editor_ta, lv_textarea_get_password_mode(target));
     lv_textarea_set_accepted_chars(ui.text_editor_ta, batch_input ? "0123456789" : nullptr);
+    lv_textarea_set_max_length(ui.text_editor_ta, batch_input ? kBatchCodeMaxLength : 0);
     lv_textarea_set_text(ui.text_editor_ta, lv_textarea_get_text(target));
     lv_keyboard_set_textarea(ui.wifi_keyboard, ui.text_editor_ta);
     lv_keyboard_set_mode(ui.wifi_keyboard, batch_input ? LV_KEYBOARD_MODE_USER_1 : LV_KEYBOARD_MODE_TEXT_LOWER);
@@ -610,8 +611,45 @@ lv_obj_t *createTextInput(lv_obj_t *parent,
     return textarea;
 }
 
+lv_obj_t *createValueField(lv_obj_t *parent,
+                           lv_coord_t x,
+                           lv_coord_t y,
+                           lv_coord_t width,
+                           const char *value_text)
+{
+    lv_obj_t *field = lv_obj_create(parent);
+    lv_obj_set_size(field, width, 46);
+    lv_obj_set_pos(field, x, y);
+    lv_obj_remove_flag(field, LV_OBJ_FLAG_SCROLLABLE);
+    lv_obj_set_style_radius(field, 14, 0);
+    lv_obj_set_style_bg_color(field, lv_color_black(), 0);
+    lv_obj_set_style_bg_opa(field, LV_OPA_COVER, 0);
+    lv_obj_set_style_border_color(field, lv_color_hex(0x1A1A1A), 0);
+    lv_obj_set_style_border_width(field, 1, 0);
+    lv_obj_set_style_shadow_width(field, 0, 0);
+    lv_obj_set_style_pad_hor(field, 14, 0);
+    lv_obj_set_style_pad_ver(field, 10, 0);
+
+    lv_obj_t *value_label = lv_label_create(field);
+    lv_obj_set_width(value_label, width - 28);
+    lv_obj_set_style_text_color(value_label, lv_color_hex(0xF5FAFC), 0);
+    lv_obj_set_style_text_font(value_label, &lv_font_montserrat_18, 0);
+    lv_label_set_long_mode(value_label, LV_LABEL_LONG_WRAP);
+    lv_label_set_text(value_label, value_text != nullptr ? value_text : "--");
+    lv_obj_align(value_label, LV_ALIGN_LEFT_MID, 0, 0);
+
+    return value_label;
+}
+
 void buildWeightPage()
 {
+    constexpr lv_coord_t kBatchFieldWidth = 116;
+    constexpr lv_coord_t kFieldGap = 12;
+    constexpr lv_coord_t kSpoolFieldX = 24 + kBatchFieldWidth + kFieldGap;
+    constexpr lv_coord_t kSpoolFieldWidth = 210;
+    constexpr lv_coord_t kFilamentFieldX = kSpoolFieldX + kSpoolFieldWidth + kFieldGap;
+    constexpr lv_coord_t kFilamentFieldWidth = 210;
+
     lv_obj_t *page = createPageContainer(ui.content_panel);
     ui.pages[pageIndex(PageId::Weight)] = page;
     createPageHeader(page, "Main", "Weigh filament spools by Batch Code and write grams to InvenTree");
@@ -655,13 +693,30 @@ void buildWeightPage()
     lv_obj_set_style_text_font(batch_label, &lv_font_montserrat_14, 0);
     lv_label_set_text(batch_label, "Batch Code");
 
-    ui.workflow_batch_ta = createTextInput(page, 24, 234, kContentInnerWidth, "Main Batch Code", "Scan or type Batch Code", false);
+    ui.workflow_batch_ta = createTextInput(page, 24, 234, kBatchFieldWidth, "Main Batch Code", "Code", false);
     lv_textarea_set_accepted_chars(ui.workflow_batch_ta, "0123456789");
+    lv_textarea_set_max_length(ui.workflow_batch_ta, kBatchCodeMaxLength);
     if (!inventree_data.batch.isEmpty())
     {
         lv_textarea_set_text(ui.workflow_batch_ta, inventree_data.batch.c_str());
     }
 
+    lv_obj_t *spool_weight_label = lv_label_create(page);
+    lv_obj_set_pos(spool_weight_label, kSpoolFieldX, 210);
+    lv_obj_set_style_text_color(spool_weight_label, lv_color_hex(0x7FA1B2), 0);
+    lv_obj_set_style_text_font(spool_weight_label, &lv_font_montserrat_14, 0);
+    lv_label_set_text(spool_weight_label, "Spool Weight");
+
+    ui.workflow_spool_weight_value = createValueField(page, kSpoolFieldX, 234, kSpoolFieldWidth, "--");
+
+    lv_obj_t *filament_weight_label = lv_label_create(page);
+    lv_obj_set_pos(filament_weight_label, kFilamentFieldX, 210);
+    lv_obj_set_style_text_color(filament_weight_label, lv_color_hex(0x7FA1B2), 0);
+    lv_obj_set_style_text_font(filament_weight_label, &lv_font_montserrat_14, 0);
+    lv_label_set_text(filament_weight_label, "Filament Weight");
+
+    ui.workflow_filament_weight_value = createValueField(page, kFilamentFieldX, 234, kFilamentFieldWidth, "--");
+
     lv_obj_t *stock_title = lv_label_create(page);
     lv_obj_set_pos(stock_title, 24, 290);
     lv_obj_set_style_text_color(stock_title, lv_color_hex(0x7FA1B2), 0);
@@ -685,7 +740,7 @@ void buildWeightPage()
     ui.weight_note_label = lv_label_create(page);
     styleCenteredText(ui.weight_note_label, kContentInnerWidth, &lv_font_montserrat_14, lv_color_hex(0x8FA3AC));
     lv_label_set_long_mode(ui.weight_note_label, LV_LABEL_LONG_WRAP);
-    lv_label_set_text(ui.weight_note_label, "Enter Batch Code, confirm input, then tap Write Weight.");
+    lv_label_set_text(ui.weight_note_label, "Enter Batch Code, confirm input, verify Spool and Filament Weight, then tap Write Weight.");
     alignTopCenter(ui.weight_note_label, 422);
 }
 
@@ -800,6 +855,7 @@ void buildInventreePage()
 
     ui.inventree_batch_ta = createTextInput(page, kLeftColumnX, 276, kColumnWidth, "InvenTree Batch Code", "Batch Code", false);
     lv_textarea_set_accepted_chars(ui.inventree_batch_ta, "0123456789");
+    lv_textarea_set_max_length(ui.inventree_batch_ta, kBatchCodeMaxLength);
     if (!inventree_data.batch.isEmpty())
     {
         lv_textarea_set_text(ui.inventree_batch_ta, inventree_data.batch.c_str());
@@ -978,6 +1034,21 @@ void refreshUi()
         setLabelTextIfChanged(ui.mode_label, "");
         setWeightStatus("RAW", lv_color_hex(0x1F5E7A));
     }
+
+    if (ui.workflow_filament_weight_value != nullptr)
+    {
+        int32_t filament_grams = 0;
+        if (getFilamentWeightGrams(filament_grams))
+        {
+            char buffer[24];
+            snprintf(buffer, sizeof(buffer), "%ld g", static_cast<long>(filament_grams));
+            setLabelTextIfChanged(ui.workflow_filament_weight_value, buffer);
+        }
+        else
+        {
+            setLabelTextIfChanged(ui.workflow_filament_weight_value, "--");
+        }
+    }
 }
 
 void setActivePage(PageId page)
@@ -1102,6 +1173,12 @@ void updateInventreeLabels()
                 meta += match.location;
             }
 
+            if (!match.spool_weight.isEmpty())
+            {
+                meta += " | Spool ";
+                meta += match.spool_weight;
+            }
+
             setLabelTextIfChanged(ui.workflow_stock_name_label, title.c_str());
             setLabelTextIfChanged(ui.workflow_stock_meta_label, meta.c_str());
         }
@@ -1118,6 +1195,36 @@ void updateInventreeLabels()
                                   "The device will load the stock item and prepare the current weight for writeback.");
         }
     }
+
+    if (ui.workflow_spool_weight_value != nullptr)
+    {
+        const char *spool_weight_text = "--";
+        if (inventree_data.selected_match >= 0 && inventree_data.selected_match < inventree_data.stored_matches)
+        {
+            const String &spool_weight = inventree_data.matches[inventree_data.selected_match].spool_weight;
+            if (!spool_weight.isEmpty())
+            {
+                spool_weight_text = spool_weight.c_str();
+            }
+        }
+
+        setLabelTextIfChanged(ui.workflow_spool_weight_value, spool_weight_text);
+    }
+
+    if (ui.workflow_filament_weight_value != nullptr)
+    {
+        int32_t filament_grams = 0;
+        if (getFilamentWeightGrams(filament_grams))
+        {
+            char buffer[24];
+            snprintf(buffer, sizeof(buffer), "%ld g", static_cast<long>(filament_grams));
+            setLabelTextIfChanged(ui.workflow_filament_weight_value, buffer);
+        }
+        else
+        {
+            setLabelTextIfChanged(ui.workflow_filament_weight_value, "--");
+        }
+    }
 }
 
 void buildUi()
@@ -1240,7 +1347,7 @@ void buildUi()
     layoutTextEditor();
 
     lv_screen_load(ui.screen);
-    setWeightNote("Enter Batch Code, confirm input, then tap Write Weight.");
+    setWeightNote("Enter Batch Code, confirm input, verify Spool and Filament Weight, then tap Write Weight.");
     setCalibrationNote("Empty the platform, tap Tare, place the 100 g reference weight, then tap Cal.");
 
     if (wifi_data.ssid.isEmpty())