diff --git a/backend/app/services/slicer_api.py b/backend/app/services/slicer_api.py
index 4317f0d0a..de8fabd52 100644
--- a/backend/app/services/slicer_api.py
+++ b/backend/app/services/slicer_api.py
@@ -199,10 +199,22 @@ def _upload_size_rejection(response: httpx.Response, model_size_bytes: int | Non
             f"{common} Raise it by setting MAX_MODEL_UPLOAD_MB on the slicer-api service and "
             f"restarting it. Sidecar said: {detail}"
         )
+    # Naming the service in the compose commands is not a style choice. The
+    # Bambu Studio sidecar sits behind `profiles: [bambu]`, and a bare
+    # `docker compose pull` silently skips every profile-gated service — so the
+    # update this message asks for was a no-op for exactly the users who need
+    # it, and `restart: unless-stopped` kept the old container serving (#2802,
+    # second round). Naming a service enables its profile implicitly, for both
+    # pull and up. `--profile bambu` would also work, but on an OrcaSlicer-only
+    # host it downloads the 220 MB Bambu image and then *starts* a sidecar the
+    # user never asked for.
     return (
-        f"{common} This sidecar image predates the configurable cap and is fixed at 100 MB — "
-        "update it with 'cd slicer-api/ && docker compose pull && docker compose up -d', which "
-        "raises the default and adds MAX_MODEL_UPLOAD_MB for going higher still. "
+        f"{common} This sidecar image predates the configurable cap and is fixed at 100 MB. "
+        "Update it with 'cd slicer-api/ && docker compose pull orca-slicer-api && "
+        "docker compose up -d orca-slicer-api', substituting 'bambu-studio-api' if that is the "
+        "sidecar you slice with. Name the service in both commands — a bare 'docker compose pull' "
+        "skips the Bambu Studio sidecar, because it sits behind a compose profile. The new image "
+        "defaults to 512 MB and adds MAX_MODEL_UPLOAD_MB for going higher still. "
         f"Sidecar said: {detail}"
     )
 
diff --git a/backend/tests/unit/test_slicer_upload_size_rejection.py b/backend/tests/unit/test_slicer_upload_size_rejection.py
index 005f31806..46ff5c3d7 100644
--- a/backend/tests/unit/test_slicer_upload_size_rejection.py
+++ b/backend/tests/unit/test_slicer_upload_size_rejection.py
@@ -140,6 +140,33 @@ class TestTheMessageIsActionable:
         assert "docker compose pull" in message
         assert "100 MB" in message
 
+    @pytest.mark.asyncio
+    async def test_the_update_command_names_the_service(self):
+        """A bare ``docker compose pull`` does not update the Bambu sidecar.
+
+        ``bambu-studio-api`` is declared with ``profiles: [bambu]``, and compose
+        skips profile-gated services unless the profile is enabled or the
+        service is named. The advice this message used to give was therefore a
+        no-op for Bambu Studio users -- they pulled, saw "up to date", restarted
+        into the same 100 MB image and came back to the issue (#2802).
+
+        Both commands are checked: pulling the right image is useless if the
+        ``up -d`` that follows leaves the old container running.
+        """
+        svc = _service(_responder(500, {"message": "File too large"}))
+
+        with pytest.raises(SlicerInputError) as excinfo:
+            await svc.slice_with_profiles(**SLICE_ARGS)
+
+        message = str(excinfo.value)
+        assert "docker compose pull orca-slicer-api" in message
+        assert "docker compose up -d orca-slicer-api" in message
+        assert "bambu-studio-api" in message
+        # The bare forms must not appear at all -- a reader who copies the first
+        # command they see must not get the one that silently does nothing.
+        assert "docker compose pull &&" not in message
+        assert "docker compose up -d'" not in message
+
     @pytest.mark.asyncio
     async def test_a_current_sidecar_is_told_which_variable_to_set(self):
         """Once the image is current, the fix is one env var, not another pull."""
diff --git a/slicer-api/README.md b/slicer-api/README.md
index 605013067..1f203a74d 100644
--- a/slicer-api/README.md
+++ b/slicer-api/README.md
@@ -84,13 +84,31 @@ flipped back to `ghcr.io/afkfelix/orca-slicer-api`.
 
 ## Updating
 
+OrcaSlicer only (the default):
+
 ```bash
 docker compose pull
+docker compose up -d
+```
+
+With the Bambu Studio sidecar — the profile flag belongs on **both**
+commands:
+
+```bash
+docker compose --profile bambu pull
 docker compose --profile bambu up -d
 ```
 
-That's it — Compose pulls the current `:latest` (or whatever
-`SIDECAR_TAG` you've pinned to) and recreates the containers.
+`bambu-studio-api` sits behind `profiles: [bambu]`, and a bare
+`docker compose pull` skips profile-gated services silently: it reports
+success, `restart: unless-stopped` keeps the old container serving, and
+you stay on the old image no matter how often you repeat it. To update
+one sidecar only, name it — `docker compose pull bambu-studio-api &&
+docker compose up -d bambu-studio-api` — which enables its profile
+implicitly.
+
+Compose pulls the current `:latest` (or whatever `SIDECAR_TAG` you've
+pinned to) and recreates the containers.
 
 To roll back to the sidecar that shipped with a previous Bambuddy
 release, set `SIDECAR_TAG=bambuddy-X.Y.Z` in `.env` and re-run the two
diff --git a/slicer-api/docker-compose.yml b/slicer-api/docker-compose.yml
index 35bdbd005..a814f540c 100644
--- a/slicer-api/docker-compose.yml
+++ b/slicer-api/docker-compose.yml
@@ -17,6 +17,11 @@
 #   docker compose up -d                       # starts OrcaSlicer only
 #   docker compose --profile bambu up -d       # starts both
 #
+# Updating: `docker compose pull` skips profile-gated services, so a bare
+# pull silently leaves bambu-studio-api on its old image (and restart:
+# unless-stopped keeps it serving). Use `docker compose --profile bambu pull`,
+# or name the service: `docker compose pull bambu-studio-api`.
+#
 # First start pulls pre-built images from GHCR (~110 MB OrcaSlicer,
 # ~220 MB BambuStudio). No local build, no git in the BuildKit worker,
 # works on QNAP / Synology / Container Station out of the box.