diff --git a/src/backend/api/routers/vision.py b/src/backend/api/routers/vision.py
index 9b4de33..626619a 100644
--- a/src/backend/api/routers/vision.py
+++ b/src/backend/api/routers/vision.py
@@ -8,6 +8,7 @@ import base64
 import binascii
 import io
 import json
+import mimetypes
 from typing import Literal
 
 from fastapi.responses import FileResponse
@@ -447,8 +448,50 @@ async def create_dxf_compare_recipe(
     placed, errors = vision_service.match_recipe_files(body["graph"], uploads)
     if errors:
         raise _422(errors)
+    # #105: l'immagine di riferimento resta nella cartella (non e' in meta, quindi
+    # /validate e l'esecuzione la ignorano) e il wizard puo' riaprirla; entra nel digest.
+    placed[f"riferimento.{_IMAGE_EXTENSIONS.get(image.content_type, 'png')}"] = image_bytes
     recipe_dir, check = await _store_validate_assign(task, body["graph"], placed)
     await vision_service.ensure_points_quote(db, task, min_points_pct)
     await db.commit()
     response.update(saved=True, recipe_dir=recipe_dir, outputs=check["outputs"])
     return response
+
+
+@router.get("/tasks/{task_id}/recipe/dxf-compare/source")
+async def get_dxf_compare_source(
+    task_id: int,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(require_maker),
+) -> dict:
+    """#105: i parametri della ricetta fatta con «Crea ricetta da DXF», per modificarla.
+
+    404 se il task non ha una ricetta del wizard (nessuna, o caricata a mano).
+    """
+    task = await _task_or_404(db, task_id)
+    source = vision_service.dxf_compare_source(task.vision_json, task.vision_recipe_dir)
+    if source is None:
+        raise HTTPException(
+            status_code=status.HTTP_404_NOT_FOUND,
+            detail="nessuna ricetta da DXF su questo task",
+        )
+    return source
+
+
+@router.get("/tasks/{task_id}/recipe/files/{path:path}")
+async def get_recipe_file(
+    task_id: int,
+    path: str,
+    db: AsyncSession = Depends(get_db),
+    current_user: User = Depends(require_maker),
+) -> FileResponse:
+    """#105: un file della cartella ricetta del task (DXF, immagine di riferimento).
+
+    Percorso non sicuro, file assente o task senza ricetta: sempre 404.
+    """
+    task = await _task_or_404(db, task_id)
+    target = vision_service.recipe_file_path(task.vision_recipe_dir, path)
+    if target is None:
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail="file not found")
+    media_type = mimetypes.guess_type(target.name)[0] or "application/octet-stream"
+    return FileResponse(target, media_type=media_type)
diff --git a/src/backend/services/vision_service.py b/src/backend/services/vision_service.py
index 8b05f53..95c5661 100644
--- a/src/backend/services/vision_service.py
+++ b/src/backend/services/vision_service.py
@@ -485,6 +485,84 @@ def list_recipe_files(recipe_dir: str | None) -> list[str]:
     )
 
 
+# #105: nomi e id della ricetta costruita da «Crea ricetta da DXF» (src/vision/costruttori.py).
+_WIZARD_DXF_FILE = "disegno.dxf"
+_WIZARD_CALIBRATION_FILE = "calibrazione.json"
+_WIZARD_REFERENCE_STEM = "riferimento"
+
+
+def _is_real_number(value: object) -> bool:
+    return isinstance(value, (int, float)) and not isinstance(value, bool) and math.isfinite(value)
+
+
+def dxf_compare_source(graph: dict | None, recipe_dir: str | None) -> dict | None:
+    """#105: i parametri con cui il wizard ha costruito la ricetta, per riaprirlo.
+
+    Legge i valori dal grafo (tool `pezzo` LocateBlob, tool `dxf` CompareDxf) e i
+    file dalla cartella ricetta. None se il grafo non e' uno del wizard (il task
+    non ha ricetta, o l'ha caricata a mano): la rotta risponde 404. Pura: niente DB.
+    """
+    if not isinstance(graph, dict) or not isinstance(graph.get("tools"), list):
+        return None
+    tools = {t.get("id"): t for t in graph["tools"] if isinstance(t, dict)}
+    pezzo, confronto = tools.get("pezzo"), tools.get("dxf")
+    if not pezzo or pezzo.get("kind") != "LocateBlob":
+        return None
+    if not confronto or confronto.get("kind") != "CompareDxf":
+        return None
+    p_values = pezzo.get("values") if isinstance(pezzo.get("values"), dict) else {}
+    c_values = confronto.get("values") if isinstance(confronto.get("values"), dict) else {}
+    band, min_pct = c_values.get("band_plus"), c_values.get("points_in_pct_nominal")
+    if not (_is_real_number(band) and _is_real_number(min_pct)):
+        return None
+    polarity = p_values.get("polarity")
+    if polarity not in ("dark", "light"):
+        polarity = "dark"  # default di LocateBlob e della rotta di creazione
+
+    folder = None
+    if recipe_dir:
+        try:
+            folder = _safe_join(settings.upload_path, recipe_dir)
+        except (ValueError, OSError):
+            folder = None
+    if folder is not None and not folder.is_dir():
+        folder = None
+
+    px_per_mm = None
+    dxf_name = None
+    image_name = None
+    if folder is not None:
+        try:
+            cal = json.loads((folder / _WIZARD_CALIBRATION_FILE).read_text(encoding="utf-8"))
+            value = cal.get("px_per_mm") if isinstance(cal, dict) else None
+            if _is_real_number(value) and value > 0:
+                px_per_mm = float(value)
+        except (OSError, ValueError):
+            px_per_mm = None  # manca o illeggibile: il wizard chiedera' la scala
+        if (folder / _WIZARD_DXF_FILE).is_file():
+            dxf_name = _WIZARD_DXF_FILE
+        for candidate in sorted(folder.glob(f"{_WIZARD_REFERENCE_STEM}.*")):
+            if candidate.is_file():
+                image_name = candidate.name
+                break
+    return {
+        "band_mm": float(band), "min_points_pct": float(min_pct), "polarity": polarity,
+        "px_per_mm": px_per_mm, "dxf": dxf_name, "image": image_name,
+    }
+
+
+def recipe_file_path(recipe_dir: str | None, relative: str) -> Path | None:
+    """#105: percorso di un file della cartella ricetta, o None se non sicuro o assente."""
+    if not recipe_dir:
+        return None
+    try:
+        folder = _safe_join(settings.upload_path, recipe_dir)
+        target = _safe_join(folder, relative)
+    except (ValueError, OSError):
+        return None
+    return target if target.is_file() else None
+
+
 def save_result_files(
     task_id: int, image_bytes: bytes, overlay: list, image_ext: str = "png",
 ) -> tuple[str, str]:
@@ -880,9 +958,27 @@ async def ensure_points_quote(
     Una sola volta: se esiste gia' una quota con `vision_output`, non si tocca.
     Se la versione ha gia' misure non si scrive (il copy-on-write sta nel router
     dei task, qui non si aggira): ritorna False. Ritorna True se l'ha creata.
+    #105: unica eccezione, la quota nata da qui (`dxf.points_in_pct`, «Punti in
+    tolleranza») senza misure segue la soglia nuova: ltl = min_points_pct, e
+    ritorna True anche in quel caso.
     """
     from src.backend.services import recipe_service  # import locale: evita cicli
 
+    # #105: ricetta ripresa e salvata con un'altra soglia -> la quota la segue
+    own = (await db.execute(
+        select(RecipeSubtask)
+        .where(RecipeSubtask.task_id == task.id)
+        .where(RecipeSubtask.vision_output == "dxf.points_in_pct")
+        .where(RecipeSubtask.description == "Punti in tolleranza")
+        .limit(1)
+    )).scalar_one_or_none()
+    if own is not None:
+        if (own.ltl is not None and float(own.ltl) == float(min_points_pct))                 or await recipe_service.version_has_measurements(db, task.version_id):
+            return False
+        own.ltl = min_points_pct
+        await db.flush()
+        return True
+
     existing = (await db.execute(
         select(RecipeSubtask.id)
         .where(RecipeSubtask.task_id == task.id)
diff --git a/src/backend/tests/test_vision_dxf_source.py b/src/backend/tests/test_vision_dxf_source.py
new file mode 100644
index 0000000..0066eb6
--- /dev/null
+++ b/src/backend/tests/test_vision_dxf_source.py
@@ -0,0 +1,226 @@
+"""#105: la ricetta «Crea ricetta da DXF» si puo' riaprire e modificare.
+
+Il worker non gira nei test: si finge come in test_vision_dxf_compare.
+"""
+import base64
+import io
+import json
+
+import pytest
+from PIL import Image
+from sqlalchemy import select
+
+from src.backend.config import settings
+from src.backend.models.orm.task import RecipeSubtask, RecipeTask
+from src.backend.services import vision_service
+from src.backend.tests.conftest import auth_headers
+from src.backend.tests.test_vision_dxf_compare import (  # noqa: F401 (fixture)
+    redirect_uploads, validate_ok,
+)
+from src.backend.tests.test_vision_recipe_upload import an_image, make_task
+
+DXF = b"0\nEOF"
+
+
+def _wizard_graph(band=0.3, pct=90.0, polarity="light") -> dict:
+    """Grafo come lo costruisce src/vision/costruttori.py::_graph."""
+    return {
+        "schema_version": 2, "name": "Confronto DXF",
+        "meta": {"dxf": {"disegno": {"path": "disegno.dxf", "sha256": "x"}},
+                 "calibration": {"path": "calibrazione.json", "sha256": "y"}},
+        "tools": [
+            {"id": "pezzo", "name": "Pezzo", "kind": "LocateBlob",
+             "values": {"polarity": polarity}, "links": {}},
+            {"id": "dxf", "name": "Confronto DXF", "kind": "CompareDxf",
+             "values": {"band_plus": band, "band_minus": band, "points_in_pct_nominal": pct},
+             "links": {}},
+        ],
+    }
+
+
+@pytest.fixture
+def w2(monkeypatch):
+    async def fake(image_bytes, dxf_bytes, **kwargs):
+        graph = _wizard_graph(kwargs["band_mm"], kwargs["min_points_pct"], kwargs["polarity"])
+        return {
+            "graph": graph,
+            "files": {
+                "disegno.dxf": base64.b64encode(dxf_bytes).decode(),
+                "calibrazione.json": base64.b64encode(
+                    json.dumps({"px_per_mm": kwargs["px_per_mm"]}).encode()).decode(),
+            },
+            "outputs": {"dxf.points_in_pct": 99.0}, "overlay": [], "outcome": "pass",
+        }
+    monkeypatch.setattr("src.backend.services.vision_service.dxf_compare_recipe", fake)
+
+
+def _bmp() -> bytes:
+    buf = io.BytesIO()
+    Image.new("L", (32, 32)).save(buf, format="BMP")
+    return buf.getvalue()
+
+
+def _save(client, user, task, *, image=None, ctype="image/png", **data):
+    return client.post(
+        f"/api/vision/tasks/{task.id}/recipe/dxf-compare",
+        headers=auth_headers(user),
+        files={"image": ("p", image if image is not None else an_image(), ctype),
+               "dxf": ("d.dxf", DXF, "application/octet-stream")},
+        data={"save": "true", "px_per_mm": "10", **{k: str(v) for k, v in data.items()}},
+    )
+
+
+@pytest.mark.asyncio
+async def test_save_keeps_the_reference_image_png(client, db_session, maker_user, w2, validate_ok):
+    task, _ = await make_task(db_session, maker_user)
+    image = an_image()
+
+    resp = await _save(client, maker_user, task, image=image)
+
+    assert resp.status_code == 200, resp.text
+    folder = settings.upload_path / resp.json()["recipe_dir"]
+    assert (folder / "riferimento.png").read_bytes() == image
+    assert (folder / "disegno.dxf").read_bytes() == DXF  # il resto della cartella non cambia
+
+
+@pytest.mark.asyncio
+async def test_save_keeps_the_reference_image_bmp(client, db_session, maker_user, w2, validate_ok):
+    task, _ = await make_task(db_session, maker_user)
+    image = _bmp()
+
+    resp = await _save(client, maker_user, task, image=image, ctype="image/bmp")
+
+    assert resp.status_code == 200, resp.text
+    folder = settings.upload_path / resp.json()["recipe_dir"]
+    assert (folder / "riferimento.bmp").read_bytes() == image
+
+
+@pytest.mark.asyncio
+async def test_source_returns_what_the_wizard_saved(client, db_session, maker_user, w2, validate_ok):
+    task, _ = await make_task(db_session, maker_user)
+    await _save(client, maker_user, task, band_mm=0.3, min_points_pct=90, polarity="light")
+
+    resp = await client.get(
+        f"/api/vision/tasks/{task.id}/recipe/dxf-compare/source", headers=auth_headers(maker_user),
+    )
+
+    assert resp.status_code == 200, resp.text
+    assert resp.json() == {
+        "band_mm": 0.3, "min_points_pct": 90.0, "polarity": "light", "px_per_mm": 10.0,
+        "dxf": "disegno.dxf", "image": "riferimento.png",
+    }
+
+
+@pytest.mark.asyncio
+async def test_source_404_without_recipe_or_with_a_hand_made_graph(client, db_session, maker_user):
+    task, _ = await make_task(db_session, maker_user)
+    url = f"/api/vision/tasks/{task.id}/recipe/dxf-compare/source"
+
+    assert (await client.get(url, headers=auth_headers(maker_user))).status_code == 404
+
+    task.vision_json = {"schema_version": 2, "name": "a mano", "tools": [], "meta": {}}
+    await db_session.commit()
+    resp = await client.get(url, headers=auth_headers(maker_user))
+    assert resp.status_code == 404
+    assert resp.json()["detail"] == "nessuna ricetta da DXF su questo task"
+
+
+@pytest.mark.asyncio
+async def test_source_needs_maker(client, db_session, maker_user, measurement_tec_user):
+    task, _ = await make_task(db_session, maker_user)
+    resp = await client.get(
+        f"/api/vision/tasks/{task.id}/recipe/dxf-compare/source",
+        headers=auth_headers(measurement_tec_user),
+    )
+    assert resp.status_code == 403
+
+
+def test_source_of_an_old_recipe_has_no_image_and_no_unreadable_scale(tmp_path, monkeypatch):
+    monkeypatch.setattr(settings, "upload_dir", str(tmp_path))
+    folder = tmp_path / "vision" / "recipes" / "1" / "abc"
+    folder.mkdir(parents=True)
+    (folder / "disegno.dxf").write_bytes(DXF)
+    (folder / "calibrazione.json").write_text("{non json", encoding="utf-8")
+
+    source = vision_service.dxf_compare_source(_wizard_graph(), "vision/recipes/1/abc")
+
+    assert source["image"] is None and source["px_per_mm"] is None
+    assert source["dxf"] == "disegno.dxf"
+    assert vision_service.dxf_compare_source(None, None) is None
+    # senza cartella i valori del grafo restano
+    assert vision_service.dxf_compare_source(_wizard_graph(), None)["dxf"] is None
+
+
+@pytest.mark.asyncio
+async def test_files_returns_the_bytes(client, db_session, maker_user, w2, validate_ok):
+    task, _ = await make_task(db_session, maker_user)
+    image = _bmp()
+    await _save(client, maker_user, task, image=image, ctype="image/bmp")
+
+    img = await client.get(
+        f"/api/vision/tasks/{task.id}/recipe/files/riferimento.bmp", headers=auth_headers(maker_user),
+    )
+    dxf = await client.get(
+        f"/api/vision/tasks/{task.id}/recipe/files/disegno.dxf", headers=auth_headers(maker_user),
+    )
+
+    assert img.status_code == 200 and img.content == image
+    assert img.headers["content-type"].startswith("image/")
+    assert dxf.status_code == 200 and dxf.content == DXF
+    assert dxf.headers["content-type"]  # dal tipo dell'estensione, di ripiego octet-stream
+
+
+@pytest.mark.asyncio
+async def test_files_404_on_unsafe_missing_or_no_recipe(client, db_session, maker_user, w2, validate_ok):
+    task, _ = await make_task(db_session, maker_user)
+    base = f"/api/vision/tasks/{task.id}/recipe/files/"
+    headers = auth_headers(maker_user)
+
+    assert (await client.get(base + "disegno.dxf", headers=headers)).status_code == 404  # nessuna ricetta
+
+    await _save(client, maker_user, task)
+    assert (await client.get(base + "manca.bmp", headers=headers)).status_code == 404
+    for unsafe in ("../x", "%2e%2e/x", "..%2f..%2fx", "sub/../../x"):
+        assert (await client.get(base + unsafe, headers=headers)).status_code == 404, unsafe
+    # la funzione non lascia uscire dalla cartella nemmeno con un assoluto
+    assert vision_service.recipe_file_path("vision/recipes/1/abc", "../x") is None
+    assert vision_service.recipe_file_path("vision/recipes/1/abc", "/etc/passwd") is None
+    assert vision_service.recipe_file_path("../fuori", "x") is None
+
+
+@pytest.mark.asyncio
+async def test_resave_follows_the_new_threshold(client, db_session, maker_user, w2, validate_ok):
+    task, _ = await make_task(db_session, maker_user)
+    task_id = task.id
+    await _save(client, maker_user, task, min_points_pct=95)
+
+    resp = await _save(client, maker_user, task, min_points_pct=80)
+
+    assert resp.status_code == 200, resp.text
+    db_session.expire_all()
+    quotes = (await db_session.execute(
+        select(RecipeSubtask).where(RecipeSubtask.vision_output == "dxf.points_in_pct")
+        .where(RecipeSubtask.task_id == task_id))).scalars().all()
+    assert len(quotes) == 1 and float(quotes[0].ltl) == 80.0
+
+
+@pytest.mark.asyncio
+async def test_ensure_points_quote_leaves_quote_with_measurements(
+    client, db_session, maker_user, w2, validate_ok, monkeypatch,
+):
+    task, _ = await make_task(db_session, maker_user)
+    task_id = task.id
+    await _save(client, maker_user, task, min_points_pct=95)
+
+    async def has_measurements(db, version_id):
+        return True
+    monkeypatch.setattr("src.backend.services.recipe_service.version_has_measurements", has_measurements)
+    task = await db_session.get(RecipeTask, task_id)
+
+    changed = await vision_service.ensure_points_quote(db_session, task, 80)
+
+    assert changed is False
+    quote = (await db_session.execute(
+        select(RecipeSubtask).where(RecipeSubtask.vision_output == "dxf.points_in_pct")
+        .where(RecipeSubtask.task_id == task_id))).scalar_one()
+    assert float(quote.ltl) == 95.0