diff --git a/flopy4/array.py b/flopy4/array.py
index 71caee4..bf70ac5 100644
--- a/flopy4/array.py
+++ b/flopy4/array.py
@@ -203,7 +203,7 @@ def __init__(
         tagged=False,
         reader=MFReader.urword,
         default_value=None,
-        extpath=None,
+        path: Optional[Path] = None,
     ):
         MFParam.__init__(
             self,
@@ -228,7 +228,7 @@ def __init__(
         self._shape = shape
         self._how = how
         self._factor = factor
-        self._extpath = extpath
+        self._path = path
 
     def __getitem__(self, item):
         return self.raw[item]
@@ -361,10 +361,10 @@ def write(self, f, **kwargs):
                     elif len(values.shape) == 3:
                         v = f"{PAD*3}"
                         for i in range(len(values)):
-                            v += v.join(
-                                " ".join(str(x) for x in y) for y in values[i]
+                            v += " ".join(
+                                f"\n{PAD*3}" + " ".join(str(x) for x in y)
+                                for y in values[i]
                             )
-                            v += f"\n{PAD*3}"
                     lines = f"{PAD*2}" + f"{MFArrayType.to_string(mfa._how)}"
                     if mfa._factor:
                         lines += f" FACTOR {mfa._factor}"
@@ -372,7 +372,7 @@ def write(self, f, **kwargs):
                 elif mfa._how == MFArrayType.external:
                     lines = (
                         f"{PAD*2}" + f"{MFArrayType.to_string(mfa._how)} "
-                        f"{mfa._extpath}\n"
+                        f"{mfa._path}\n"
                     )
                 elif mfa._how == MFArrayType.constant:
                     lines = (
@@ -384,7 +384,7 @@ def write(self, f, **kwargs):
             values = self.raw
             if self._how == MFArrayType.internal:
                 if len(values.shape) == 1:
-                    v = f"{PAD*3}"
+                    v = f"\n{PAD*3}"
                     v += " ".join([str(x) for x in values])
                 elif len(values.shape) == 2:
                     v = f"\n{PAD*3}"
@@ -392,22 +392,22 @@ def write(self, f, **kwargs):
                 elif len(values.shape) == 3:
                     v = f"{PAD*3}"
                     for i in range(len(values)):
-                        v += v.join(
-                            " ".join(str(x) for x in y) for y in values[i]
+                        v += " ".join(
+                            f"\n{PAD*3}" + " ".join(str(x) for x in y)
+                            for y in values[i]
                         )
-                        v += f"\n{PAD*3}"
                 lines = (
                     f"{PAD}" + f"{self.name.upper()}\n"
                     f"{PAD*2}" + f"{MFArrayType.to_string(self._how)}"
                 )
                 if self._factor:
                     lines += f" FACTOR {self._factor}"
-                lines += f"\n{v}\n"
+                lines += f"{v}\n"
             elif self._how == MFArrayType.external:
                 lines = (
                     f"{PAD}" + f"{self.name.upper()}\n"
                     f"{PAD*2}"
-                    + f"{MFArrayType.to_string(self._how)} {self._extpath}\n"
+                    + f"{MFArrayType.to_string(self._how)} {self._path}\n"
                 )
             elif self._how == MFArrayType.constant:
                 lines = (
@@ -491,7 +491,7 @@ def _load(cls, f, cwd, shape, layered=False, **kwargs):
             array=array,
             how=how,
             factor=factor,
-            extpath=extpath,
+            path=extpath,
             **kwargs,
         )