diff --git a/CHANGELOG.md b/CHANGELOG.md
index 43ab117c5..e3ae9ff90 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -13,6 +13,9 @@ All notable changes to Bambuddy will be documented in this file.
   - Print energy tracking now works correctly for HA plugs (not just Tasmota)
   - New API endpoint: `GET /api/v1/smart-plugs/ha/sensors` to list available energy sensors
 
+### Fixed
+- **Filament cost using wrong default** - Statistics now correctly uses the "Default filament cost (per kg)" setting instead of hardcoded €25 value (Issue #120)
+
 ## [0.1.6b10] - 2026-01-21
 
 ### New Features
diff --git a/backend/app/api/routes/archives.py b/backend/app/api/routes/archives.py
index be73f3923..a27f6cbf8 100644
--- a/backend/app/api/routes/archives.py
+++ b/backend/app/api/routes/archives.py
@@ -627,6 +627,7 @@ async def toggle_favorite(
 @router.post("/{archive_id}/rescan", response_model=ArchiveResponse)
 async def rescan_archive(archive_id: int, db: AsyncSession = Depends(get_db)):
     """Rescan the 3MF file and update metadata."""
+    from backend.app.api.routes.settings import get_setting
     from backend.app.services.archive import ThreeMFParser
 
     result = await db.execute(select(PrintArchive).where(PrintArchive.id == archive_id))
@@ -672,7 +673,10 @@ async def rescan_archive(archive_id: int, db: AsyncSession = Depends(get_db)):
         if filament:
             archive.cost = round((archive.filament_used_grams / 1000) * filament.cost_per_kg, 2)
         else:
-            archive.cost = round((archive.filament_used_grams / 1000) * 25.0, 2)
+            # Use default filament cost from settings
+            default_cost_setting = await get_setting(db, "default_filament_cost")
+            default_cost_per_kg = float(default_cost_setting) if default_cost_setting else 25.0
+            archive.cost = round((archive.filament_used_grams / 1000) * default_cost_per_kg, 2)
 
     await db.commit()
     await db.refresh(archive)
@@ -682,13 +686,18 @@ async def rescan_archive(archive_id: int, db: AsyncSession = Depends(get_db)):
 @router.post("/recalculate-costs")
 async def recalculate_all_costs(db: AsyncSession = Depends(get_db)):
     """Recalculate costs for all archives based on filament usage and prices."""
+    from backend.app.api.routes.settings import get_setting
+
     result = await db.execute(select(PrintArchive))
     archives = list(result.scalars().all())
 
     # Load all filaments for lookup
     filament_result = await db.execute(select(Filament))
     filaments = {f.type: f.cost_per_kg for f in filament_result.scalars().all()}
-    default_cost_per_kg = 25.0
+
+    # Get default filament cost from settings
+    default_cost_setting = await get_setting(db, "default_filament_cost")
+    default_cost_per_kg = float(default_cost_setting) if default_cost_setting else 25.0
 
     updated = 0
     for archive in archives:
diff --git a/backend/app/services/archive.py b/backend/app/services/archive.py
index 4c7fed8fb..c0a3a27dc 100644
--- a/backend/app/services/archive.py
+++ b/backend/app/services/archive.py
@@ -844,8 +844,11 @@ class ArchiveService:
             if filament:
                 cost = round((filament_grams / 1000) * filament.cost_per_kg, 2)
             else:
-                # Default cost_per_kg if filament type not found
-                default_cost_per_kg = 25.0
+                # Use default filament cost from settings
+                from backend.app.api.routes.settings import get_setting
+
+                default_cost_setting = await get_setting(self.db, "default_filament_cost")
+                default_cost_per_kg = float(default_cost_setting) if default_cost_setting else 25.0
                 cost = round((filament_grams / 1000) * default_cost_per_kg, 2)
 
         # Calculate quantity from printable objects count