diff --git a/backend/Dockerfile b/backend/Dockerfile
index 2239f80..6be68ae 100644
--- a/backend/Dockerfile
+++ b/backend/Dockerfile
@@ -10,6 +10,8 @@ RUN ./gradlew bootJar -x test --no-daemon
 
 # Stage 2: Runtime Environment
 FROM eclipse-temurin:21-jre-jammy
+ARG ORCA_VERSION=2.3.1
+ARG ORCA_DOWNLOAD_URL
 
 # Install system dependencies for OrcaSlicer (same as before)
 RUN apt-get update && apt-get install -y \
@@ -25,7 +27,12 @@ RUN apt-get update && apt-get install -y \
 
 # Install OrcaSlicer
 WORKDIR /opt
-RUN wget -q https://github.com/SoftFever/OrcaSlicer/releases/download/v2.2.0/OrcaSlicer_Linux_V2.2.0.AppImage -O OrcaSlicer.AppImage \
+RUN set -eux; \
+    ORCA_URL="${ORCA_DOWNLOAD_URL:-}"; \
+    if [ -z "${ORCA_URL}" ]; then \
+      ORCA_URL="https://github.com/OrcaSlicer/OrcaSlicer/releases/download/v${ORCA_VERSION}/OrcaSlicer_Linux_V${ORCA_VERSION}.AppImage"; \
+    fi; \
+    wget -q "${ORCA_URL}" -O OrcaSlicer.AppImage \
     && 7z x OrcaSlicer.AppImage -o/opt/orcaslicer \
     && chmod -R +x /opt/orcaslicer \
     && rm OrcaSlicer.AppImage
diff --git a/frontend/src/app/features/calculator/calculator-page.component.html b/frontend/src/app/features/calculator/calculator-page.component.html
index ab7ae3a..03c86d5 100644
--- a/frontend/src/app/features/calculator/calculator-page.component.html
+++ b/frontend/src/app/features/calculator/calculator-page.component.html
@@ -4,6 +4,13 @@
 
   @if (error()) {
     <app-alert type="error">{{ errorKey() | translate }}</app-alert>
+    @if (isZeroQuoteError()) {
+      <div class="error-action">
+        <app-button variant="outline" (click)="onConsult()">
+          {{ "QUOTE.CONSULT" | translate }}
+        </app-button>
+      </div>
+    }
   }
 </div>
 
@@ -65,6 +72,16 @@
           (proceed)="onProceed()"
           (itemChange)="onItemChange($event)"
         ></app-quote-result>
+      } @else if (isZeroQuoteError()) {
+        <app-card class="zero-result-card">
+          <h3>{{ "CALC.ZERO_RESULT_TITLE" | translate }}</h3>
+          <p>{{ "CALC.ZERO_RESULT_HELP" | translate }}</p>
+          <div class="zero-result-action">
+            <app-button variant="outline" (click)="onConsult()">
+              {{ "QUOTE.CONSULT" | translate }}
+            </app-button>
+          </div>
+        </app-card>
       } @else {
         <app-card>
           <h3>{{ "CALC.BENEFITS_TITLE" | translate }}</h3>
diff --git a/frontend/src/app/features/calculator/calculator-page.component.scss b/frontend/src/app/features/calculator/calculator-page.component.scss
index 1eb6b2e..1b878cd 100644
--- a/frontend/src/app/features/calculator/calculator-page.component.scss
+++ b/frontend/src/app/features/calculator/calculator-page.component.scss
@@ -9,6 +9,12 @@
   margin: 0 auto;
 }
 
+.error-action {
+  display: flex;
+  justify-content: center;
+  margin-top: calc(var(--space-4) * -1);
+}
+
 .content-grid {
   display: grid;
   grid-template-columns: 1fr;
@@ -82,6 +88,15 @@
   line-height: 2;
 }
 
+.zero-result-card p {
+  color: var(--color-text-muted);
+  line-height: 1.6;
+}
+
+.zero-result-action {
+  margin-top: var(--space-4);
+}
+
 .loader-content {
   text-align: center;
   max-width: 300px;
diff --git a/frontend/src/app/features/calculator/calculator-page.component.ts b/frontend/src/app/features/calculator/calculator-page.component.ts
index 14e7a12..8619be5 100644
--- a/frontend/src/app/features/calculator/calculator-page.component.ts
+++ b/frontend/src/app/features/calculator/calculator-page.component.ts
@@ -1,5 +1,6 @@
 import {
   Component,
+  computed,
   signal,
   ViewChild,
   ElementRef,
@@ -12,6 +13,7 @@ import { map } from 'rxjs/operators';
 
 import { AppCardComponent } from '../../shared/components/app-card/app-card.component';
 import { AppAlertComponent } from '../../shared/components/app-alert/app-alert.component';
+import { AppButtonComponent } from '../../shared/components/app-button/app-button.component';
 import { UploadFormComponent } from './components/upload-form/upload-form.component';
 import { QuoteResultComponent } from './components/quote-result/quote-result.component';
 import {
@@ -31,6 +33,7 @@ import { LanguageService } from '../../core/services/language.service';
     TranslateModule,
     AppCardComponent,
     AppAlertComponent,
+    AppButtonComponent,
     UploadFormComponent,
     QuoteResultComponent,
     SuccessStateComponent,
@@ -47,6 +50,9 @@ export class CalculatorPageComponent implements OnInit {
   result = signal<QuoteResult | null>(null);
   error = signal<boolean>(false);
   errorKey = signal<string>('CALC.ERROR_GENERIC');
+  isZeroQuoteError = computed(
+    () => this.error() && this.errorKey() === 'CALC.ERROR_ZERO_PRICE',
+  );
 
   orderSuccess = signal(false);
 
@@ -318,7 +324,10 @@ export class CalculatorPageComponent implements OnInit {
   private currentRequest: QuoteRequest | null = null;
 
   onConsult() {
-    if (!this.currentRequest) return;
+    if (!this.currentRequest) {
+      this.router.navigate(['/', this.languageService.selectedLang(), 'contact']);
+      return;
+    }
 
     const req = this.currentRequest;
     let details = `Richiesta Preventivo:\n`;
@@ -349,7 +358,16 @@ export class CalculatorPageComponent implements OnInit {
   }
 
   private isInvalidQuote(result: QuoteResult): boolean {
-    return !Number.isFinite(result.totalPrice) || result.totalPrice <= 0;
+    const invalidPrice =
+      !Number.isFinite(result.totalPrice) || result.totalPrice <= 0;
+    const invalidWeight =
+      !Number.isFinite(result.totalWeight) || result.totalWeight <= 0;
+    const invalidTime =
+      !Number.isFinite(result.totalTimeHours) ||
+      !Number.isFinite(result.totalTimeMinutes) ||
+      (result.totalTimeHours <= 0 && result.totalTimeMinutes <= 0);
+
+    return invalidPrice || invalidWeight || invalidTime;
   }
 
   private setQuoteError(key: string): void {
diff --git a/frontend/src/assets/i18n/de.json b/frontend/src/assets/i18n/de.json
index 49b29ed..f2bb3d1 100644
--- a/frontend/src/assets/i18n/de.json
+++ b/frontend/src/assets/i18n/de.json
@@ -91,7 +91,9 @@
     "NOTES_PLACEHOLDER": "Spezifische Anweisungen...",
     "SETUP_NOTE": "* Beinhaltet {{cost}} als Einrichtungskosten",
     "SHIPPING_NOTE": "** Versandkosten ausgeschlossen, werden im nächsten Schritt berechnet",
-    "ERROR_ZERO_PRICE": "Etwas ist schiefgelaufen. Versuche ein anderes Format oder kontaktiere uns."
+    "ERROR_ZERO_PRICE": "Bei der Berechnung ist etwas schiefgelaufen. Versuche ein anderes Format oder kontaktiere uns direkt über \"Beratung anfragen\".",
+    "ZERO_RESULT_TITLE": "Ungültiges Ergebnis",
+    "ZERO_RESULT_HELP": "Die Berechnung hat ungültige Werte (0) geliefert. Versuche ein anderes Dateiformat oder kontaktiere uns direkt über \"Beratung anfragen\"."
   },
   "SHOP": {
     "TITLE": "Technische Lösungen",
diff --git a/frontend/src/assets/i18n/en.json b/frontend/src/assets/i18n/en.json
index a61b7d3..e65a8ce 100644
--- a/frontend/src/assets/i18n/en.json
+++ b/frontend/src/assets/i18n/en.json
@@ -91,7 +91,9 @@
     "NOTES_PLACEHOLDER": "Specific instructions...",
     "SETUP_NOTE": "* Includes {{cost}} as setup cost",
     "SHIPPING_NOTE": "** Shipping costs excluded, calculated at the next step",
-    "ERROR_ZERO_PRICE": "Something went wrong. Try another format or contact us."
+    "ERROR_ZERO_PRICE": "Something went wrong during the calculation. Try another format or contact us directly via Request Consultation.",
+    "ZERO_RESULT_TITLE": "Invalid Result",
+    "ZERO_RESULT_HELP": "The calculation returned invalid zero values. Try another file format or contact us directly via Request Consultation."
   },
   "SHOP": {
     "TITLE": "Technical solutions",
diff --git a/frontend/src/assets/i18n/fr.json b/frontend/src/assets/i18n/fr.json
index e9f3ad4..70f2bde 100644
--- a/frontend/src/assets/i18n/fr.json
+++ b/frontend/src/assets/i18n/fr.json
@@ -116,7 +116,9 @@
     "FALLBACK_MATERIAL": "PLA (fallback)",
     "FALLBACK_QUALITY_STANDARD": "Standard",
     "ERR_FILE_TOO_LARGE": "Certains fichiers dépassent la limite de 200MB et n'ont pas été ajoutés.",
-    "ERROR_ZERO_PRICE": "Quelque chose s'est mal passé. Essayez un autre format ou contactez-nous."
+    "ERROR_ZERO_PRICE": "Un problème est survenu pendant le calcul. Essayez un autre format ou contactez-nous directement via Demander une consultation.",
+    "ZERO_RESULT_TITLE": "Résultat invalide",
+    "ZERO_RESULT_HELP": "Le calcul a renvoyé des valeurs nulles invalides. Essayez un autre format de fichier ou contactez-nous directement via Demander une consultation."
   },
   "QUOTE": {
     "PROCEED_ORDER": "Procéder à la commande",
diff --git a/frontend/src/assets/i18n/it.json b/frontend/src/assets/i18n/it.json
index 15437f2..af78b60 100644
--- a/frontend/src/assets/i18n/it.json
+++ b/frontend/src/assets/i18n/it.json
@@ -116,7 +116,9 @@
     "FALLBACK_MATERIAL": "PLA (fallback)",
     "FALLBACK_QUALITY_STANDARD": "Standard",
     "ERR_FILE_TOO_LARGE": "Alcuni file superano il limite di 200MB e non sono stati aggiunti.",
-    "ERROR_ZERO_PRICE": "Qualcosa è andato storto. Prova con un altro formato oppure contattaci."
+    "ERROR_ZERO_PRICE": "Qualcosa è andato storto nel calcolo. Prova un altro formato o contattaci direttamente con Richiedi Consulenza.",
+    "ZERO_RESULT_TITLE": "Risultato non valido",
+    "ZERO_RESULT_HELP": "Il calcolo ha restituito valori non validi (0). Prova con un altro formato file oppure contattaci direttamente con Richiedi Consulenza."
   },
   "QUOTE": {
     "PROCEED_ORDER": "Procedi con l'ordine",