diff --git a/backend/src/main/java/com/printcalculator/controller/QuoteController.java b/backend/src/main/java/com/printcalculator/controller/QuoteController.java
index 2122ac8..f283338 100644
--- a/backend/src/main/java/com/printcalculator/controller/QuoteController.java
+++ b/backend/src/main/java/com/printcalculator/controller/QuoteController.java
@@ -7,6 +7,7 @@ import com.printcalculator.model.QuoteResult;
 import com.printcalculator.model.StlBounds;
 import com.printcalculator.repository.PrinterMachineRepository;
 import com.printcalculator.service.QuoteCalculator;
+import com.printcalculator.service.ProfileManager;
 import com.printcalculator.service.SlicerService;
 import com.printcalculator.service.StlService;
 import org.springframework.http.ResponseEntity;
@@ -29,16 +30,18 @@ public class QuoteController {
     private final StlService stlService;
     private final QuoteCalculator quoteCalculator;
     private final PrinterMachineRepository machineRepo;
+    private final ProfileManager profileManager;
 
     // Defaults (using aliases defined in ProfileManager)
     private static final String DEFAULT_FILAMENT = "pla_basic";
     private static final String DEFAULT_PROCESS = "standard";
 
-    public QuoteController(SlicerService slicerService, StlService stlService, QuoteCalculator quoteCalculator, PrinterMachineRepository machineRepo) {
+    public QuoteController(SlicerService slicerService, StlService stlService, QuoteCalculator quoteCalculator, PrinterMachineRepository machineRepo, ProfileManager profileManager) {
         this.slicerService = slicerService;
         this.stlService = stlService;
         this.quoteCalculator = quoteCalculator;
         this.machineRepo = machineRepo;
+        this.profileManager = profileManager;
     }
 
     @PostMapping("/api/quote")
@@ -125,6 +128,7 @@ public class QuoteController {
             if (slicerMachineProfile == null || slicerMachineProfile.isEmpty()) {
                 slicerMachineProfile = "bambu_a1"; 
             }
+            slicerMachineProfile = profileManager.resolveMachineProfileName(slicerMachineProfile, nozzleDiameter);
 
             // Validate model size against machine volume
             StlBounds bounds = validateModelSize(tempInput.toFile(), machine);
diff --git a/backend/src/main/java/com/printcalculator/controller/QuoteSessionController.java b/backend/src/main/java/com/printcalculator/controller/QuoteSessionController.java
index c677efa..7df1aa3 100644
--- a/backend/src/main/java/com/printcalculator/controller/QuoteSessionController.java
+++ b/backend/src/main/java/com/printcalculator/controller/QuoteSessionController.java
@@ -11,6 +11,7 @@ import com.printcalculator.repository.PrinterMachineRepository;
 import com.printcalculator.repository.QuoteLineItemRepository;
 import com.printcalculator.repository.QuoteSessionRepository;
 import com.printcalculator.service.QuoteCalculator;
+import com.printcalculator.service.ProfileManager;
 import com.printcalculator.service.SlicerService;
 import com.printcalculator.service.StlService;
 import org.springframework.http.MediaType;
@@ -45,6 +46,7 @@ public class QuoteSessionController {
     private final SlicerService slicerService;
     private final StlService stlService;
     private final QuoteCalculator quoteCalculator;
+    private final ProfileManager profileManager;
     private final PrinterMachineRepository machineRepo;
     private final com.printcalculator.repository.PricingPolicyRepository pricingRepo;
     private final com.printcalculator.service.StorageService storageService;
@@ -58,6 +60,7 @@ public class QuoteSessionController {
                                   SlicerService slicerService,
                                   StlService stlService,
                                   QuoteCalculator quoteCalculator,
+                                  ProfileManager profileManager,
                                   PrinterMachineRepository machineRepo,
                                   com.printcalculator.repository.PricingPolicyRepository pricingRepo,
                                   com.printcalculator.service.StorageService storageService) {
@@ -66,6 +69,7 @@ public class QuoteSessionController {
         this.slicerService = slicerService;
         this.stlService = stlService;
         this.quoteCalculator = quoteCalculator;
+        this.profileManager = profileManager;
         this.machineRepo = machineRepo;
         this.pricingRepo = pricingRepo;
         this.storageService = storageService;
@@ -163,6 +167,7 @@ public class QuoteSessionController {
             if (machineProfile == null || machineProfile.isBlank()) {
                 machineProfile = "bambu_a1"; // final fallback (alias handled in ProfileManager)
             }
+            machineProfile = profileManager.resolveMachineProfileName(machineProfile, settings.getNozzleDiameter());
             
             String filamentProfile = "Generic " + (settings.getMaterial() != null ? settings.getMaterial().toUpperCase() : "PLA");
             // Mapping: "pla_basic" -> "Generic PLA", "petg_basic" -> "Generic PETG"
diff --git a/backend/src/main/java/com/printcalculator/service/ProfileManager.java b/backend/src/main/java/com/printcalculator/service/ProfileManager.java
index c6bd78a..20ab438 100644
--- a/backend/src/main/java/com/printcalculator/service/ProfileManager.java
+++ b/backend/src/main/java/com/printcalculator/service/ProfileManager.java
@@ -16,6 +16,7 @@ import java.util.logging.Logger;
 import java.util.stream.Stream;
 import java.util.Map;
 import java.util.HashMap;
+import java.math.BigDecimal;
 
 @Service
 public class ProfileManager {
@@ -59,6 +60,18 @@ public class ProfileManager {
         return resolveInheritance(profilePath);
     }
 
+    public String resolveMachineProfileName(String machineName, Double nozzleDiameter) {
+        String resolvedName = profileAliases.getOrDefault(machineName, machineName);
+        if (nozzleDiameter == null) return resolvedName;
+
+        String base = resolvedName.replaceAll("\\s*\\d+(?:\\.\\d+)?\\s*nozzle$", "").trim();
+        String formatted = BigDecimal.valueOf(nozzleDiameter).stripTrailingZeros().toPlainString();
+        String candidate = base + " " + formatted + " nozzle";
+
+        Path exists = findProfileFile(candidate, "machine");
+        return exists != null ? candidate : resolvedName;
+    }
+
     private Path findProfileFile(String name, String type) {
         // Check aliases first
         String resolvedName = profileAliases.getOrDefault(name, name);
diff --git a/backend/src/test/java/com/printcalculator/ManualSessionPersistenceTest.java b/backend/src/test/java/com/printcalculator/ManualSessionPersistenceTest.java
index adc2200..9470dd4 100644
--- a/backend/src/test/java/com/printcalculator/ManualSessionPersistenceTest.java
+++ b/backend/src/test/java/com/printcalculator/ManualSessionPersistenceTest.java
@@ -11,6 +11,7 @@ import com.printcalculator.service.SlicerService;
 import com.printcalculator.service.QuoteCalculator;
 import com.printcalculator.service.StorageService;
 import com.printcalculator.service.StlService;
+import com.printcalculator.service.ProfileManager;
 import com.printcalculator.model.PrintStats;
 import com.printcalculator.model.QuoteResult;
 import com.printcalculator.entity.PrinterMachine;
@@ -63,6 +64,9 @@ public class ManualSessionPersistenceTest {
 
     @MockitoBean
     private StlService stlService;
+
+    @MockitoBean
+    private ProfileManager profileManager;
     
     @MockitoBean
     private QuoteCalculator quoteCalculator;
@@ -113,6 +117,7 @@ public class ManualSessionPersistenceTest {
         when(stlService.readBounds(any())).thenReturn(new StlBounds(0, 0, 0, 10, 10, 10));
         when(stlService.shiftToFitIfNeeded(any(), any(), anyInt(), anyInt(), anyInt()))
                 .thenReturn(new StlShiftResult(null, 0, 0, 0, false));
+        when(profileManager.resolveMachineProfileName(any(), any())).thenAnswer(i -> i.getArguments()[0]);
         when(storageService.loadAsResource(any())).thenReturn(new org.springframework.core.io.ByteArrayResource("dummy".getBytes()){
             @Override
             public File getFile() { return new File("dummy"); }