Revert "🐛 Fix save cad unit"

This reverts commit a48ed9f.
Apparently this is post V1...

bluemira/codes/_freecadapi.py

@@ -1634,7 +1634,9 @@ def wrapper(objs: Part.Feature, filename: str, *, tessellate: float = 0.5, **kwa
     return wrapper  # noqa: DOC201
 
 
-def save_as_STP(shapes: list[apiShape], filename: str = "test"):
+def save_as_STP(
+    shapes: list[apiShape], filename: str = "test", unit_scale: str = "metre"
+):
     """
     Saves a series of Shape objects as a STEP assembly
 
@@ -1644,6 +1646,8 @@ def save_as_STP(shapes: list[apiShape], filename: str = "test"):
         Iterable of shape objects to be saved
     filename:
         Full path filename of the STP assembly
+    unit_scale:
+        The scale in which to save the Shape objects
 
     Raises
     ------
@@ -1667,6 +1671,13 @@ def save_as_STP(shapes: list[apiShape], filename: str = "test"):
         raise FreeCADError("Shape is null.")
 
     compound = make_compound(shapes)
+    scale = raw_uc(1, unit_scale, "mm")
+
+    if scale != 1:
+        # scale the compound. Since the scale function modifies directly the shape,
+        # a copy of the compound is made to avoid modification of the original shapes.
+        compound = scale_shape(compound.copy(), scale)
+
     compound.exportStep(filename)
 
 
@@ -1691,6 +1702,7 @@ def save_cad(
     filename: str,
     cad_format: str | CADFileType = "stp",
     labels: Iterable[str] | None = None,
+    unit_scale: str = "metre",
     **kwargs,
 ):
     """
@@ -1706,6 +1718,8 @@ def save_cad(
         file cad_format
     labels:
         shape labels
+    unit_scale:
+        unit to save the objects as.
     kwargs:
         passed to freecad preferences configuration
 
@@ -1735,8 +1749,14 @@ def save_cad(
     })
 
     with Document() as doc:
+        objs = list(doc.setup(shapes, labels))
+
+        # Part is always built in mm but some formats are unitless
+        if cad_format not in CADFileType.unitless_formats():
+            _scale_obj(objs, scale=raw_uc(1, unit_scale, "mm"))
+
         try:
-            cad_format.exporter(list(doc.setup(shapes, labels)), filename, **kwargs)
+            cad_format.exporter(objs, filename, **kwargs)
         except ImportError as imp_err:
             raise FreeCADError(
                 f"Unable to save to {cad_format.value} please try through the main"

bluemira/codes/_freecadconfig.py

@@ -14,7 +14,7 @@
 import FreeCAD
 
 
-class FCUnit(enum.IntEnum):
+class _Unit(enum.IntEnum):
     """Available units in FreeCAD"""
 
     MM = 0  # mmKS
@@ -50,7 +50,9 @@ def _freecad_save_config(
     This must be run before Part is imported for legacy exporters
     """
     unit_prefs = FreeCAD.ParamGet("User parameter:BaseApp/Preferences/Units")
-    unit_prefs.SetInt("UserSchema", FCUnit[unit].value)
+    # Seems to have little effect on anything but its an option to set
+    # does effect the GUI be apparently not the base unit of the built part...
+    unit_prefs.SetInt("UserSchema", _Unit[unit].value)
     unit_prefs.SetInt("Decimals", no_dp)  # 100th mm
 
     part_step_prefs = FreeCAD.ParamGet(
@@ -60,7 +62,7 @@ def _freecad_save_config(
     part_step_prefs.SetString("Author", author)
     part_step_prefs.SetString("Company", "Bluemira")
     # Seems to have little effect on anything but its an option to set
-    part_step_prefs.SetInt("Unit", FCUnit[unit].value)
+    part_step_prefs.SetInt("Unit", _Unit[unit].value)
 
     part_step_2_prefs = FreeCAD.ParamGet(
         "User parameter:BaseApp/Preferences/Mod/Import/hSTEP"

bluemira/geometry/tools.py

@@ -1572,6 +1572,7 @@ def is_convex(points: npt.NDArray):
 def save_as_STP(
     shapes: BluemiraGeoT | Iterable[BluemiraGeoT],
     filename: str,
+    unit_scale: str = "metre",
     **kwargs,
 ):
     """
@@ -1583,13 +1584,15 @@ def save_as_STP(
         List of shape objects to be saved
     filename:
         Full path filename of the STP assembly
+    unit_scale:
+        The scale in which to save the Shape objects
     """
     filename = force_file_extension(filename, [".stp", ".step"])
 
     if not isinstance(shapes, list):
         shapes = list(shapes) if isinstance(shapes, Iterable) else [shapes]
 
-    cadapi.save_as_STP([s.shape for s in shapes], filename, **kwargs)
+    cadapi.save_as_STP([s.shape for s in shapes], filename, unit_scale, **kwargs)
 
 
 def save_cad(

examples/geometry/geometry_tutorial.ex.py

@@ -403,4 +403,5 @@
     filename=Path(
         get_bluemira_path("", subfolder="generated_data"), my_file_path
     ).as_posix(),
+    unit_scale="metre",
 )