diff --git a/zetastitcher/fuse/fuse.py b/zetastitcher/fuse/fuse.py
index b7cefb2..ab42c59 100644
--- a/zetastitcher/fuse/fuse.py
+++ b/zetastitcher/fuse/fuse.py
@@ -68,7 +68,7 @@ def squircle_alpha(height, width):
     return squircle
 
 
-def fuse_queue(q, dest, frame_shape, debug=False):
+def fuse_queue(q, dest, frame_shape, weighting_mode="squircle_alpha", debug=False):
     """Fuse a queue of images along Y, optionally applying padding.
 
     Parameters
@@ -87,6 +87,9 @@ def fuse_queue(q, dest, frame_shape, debug=False):
         Shape of a stack plane (XY).
     dest : :class:`numpy.ndarray`
         Destination array.
+    weighting_mode : str
+        Weighting mode, defines the weighting window used to fuse overlapping slices.
+        Currently only ``squircle_alpha`` and ``none`` are supported.
     debug: bool
         Whether to overlay debug information (tile edges and numbers).
     """
@@ -113,7 +116,12 @@ def fuse_queue(q, dest, frame_shape, debug=False):
             z = np.unique(z)
             z = np.sort(z)
 
-            xy_weights = squircle_alpha(*frame_shape)
+            if weighting_mode == "squircle_alpha":
+                xy_weights = squircle_alpha(*frame_shape)
+            elif weighting_mode == "none":
+                xy_weights = np.ones(frame_shape)
+            else:
+                raise ValueError("Unknown weighting mode: {}".format(weighting_mode))
 
             z_list = list(zip(z, z[1::]))
             try:
@@ -135,8 +143,8 @@ def fuse_queue(q, dest, frame_shape, debug=False):
                     area = width * height
                     if not area:
                         continue
-
-                    w = squircle_alpha(*frame_shape)[:height, :width]
+                    
+                    w = xy_weights[:height, :width]
 
                     if row.X_from == 0:
                         w = np.fliplr(w)
diff --git a/zetastitcher/fuse/virtual_fused_volume.py b/zetastitcher/fuse/virtual_fused_volume.py
index 0a116e1..ac97b43 100644
--- a/zetastitcher/fuse/virtual_fused_volume.py
+++ b/zetastitcher/fuse/virtual_fused_volume.py
@@ -48,7 +48,7 @@ class VirtualFusedVolume:
         ('0100_0000.tiff', (slice(40, 41, 1), slice(1000, 1500, 1), slice(0, 453, 1))),
     ]
     """
-    def __init__(self, file_or_matrix):
+    def __init__(self, file_or_matrix, weighting_mode: str = 'squircle_alpha'):
         if isinstance(file_or_matrix, str):
             self.path, _ = os.path.split(file_or_matrix)
             self.fm = FileMatrix(file_or_matrix)
@@ -78,7 +78,10 @@ def __init__(self, file_or_matrix):
             self.nchannels = f.nchannels
 
         self.squeeze_enabled = True
-
+        self.weighting_mode = weighting_mode
+        if self.weighting_mode not in ['squircle_alpha', 'none']:
+            raise ValueError('Invalid weighting mode: {}'.format(self.weighting_mode))
+    
     @property
     def overlay_debug_enabled(self):
         """Whether to overlay debug information (tile edges and numbers).
@@ -229,6 +232,7 @@ def __getitem__(self, item):
             args=(q, fused, self.temp_shape[-2::]),
             kwargs={
                 'debug': self._debug,
+                'weighting_mode': self.weighting_mode,
             }
         )
         t.start()
diff --git a/zetastitcher/io/inputfile.py b/zetastitcher/io/inputfile.py
index 9929c04..34473e6 100644
--- a/zetastitcher/io/inputfile.py
+++ b/zetastitcher/io/inputfile.py
@@ -56,21 +56,46 @@ def __getitem__(self, item):
             step = item[0].step
         else:
             raise TypeError("Invalid type: {}".format(type(item[0])))
+        try:
+            a = self.zslice(start, stop, step)
 
-        a = self.zslice(start, stop, step)
+            if not a.size:
+                return a
 
-        if not a.size:
-            return a
+            if item[0] is not Ellipsis:
+                myitem[0] = slice(None)
 
-        if item[0] is not Ellipsis:
-            myitem[0] = slice(None)
+            a = a[tuple(myitem)]
+        except np.core._exceptions._ArrayMemoryError:
+            z_start, z_stop, z_step, z_width = self._slice_to_idxs(myitem[0],0)
+            y_start, y_stop, y_step, y_width = self._slice_to_idxs(myitem[1],1)
+            x_start, x_stop, x_step, x_width = self._slice_to_idxs(myitem[2],2)
+            a = None
+            for idx, i in enumerate(range(z_start, z_stop, z_step)):
+                frame = self.zslice_idx(i)[0]
+                if a is None:
+                    a = np.zeros((z_width, y_width, x_width), dtype=self.dtype)
+                a[slice(idx,idx+1,1), myitem[1], myitem[2]] = frame[myitem[1], myitem[2]]
 
-        a = a[tuple(myitem)]
+            #raise MemoryError('Not enough memory to load the requested data')
 
         if self.squeeze:
             a = np.squeeze(a)
         return a
 
+    def _slice_to_idxs(self, _slice, idx=0):
+        start = _slice.start if _slice.start is not None else 0
+        if start < 0:
+            start += self.shape[idx]
+        stop = _slice.stop if _slice.stop is not None else self.shape[idx]
+        if stop < 0:
+            stop += self.shape[idx]
+        step = _slice.step if _slice.step is not None else 1
+        slice_width = (stop - start) // step
+        
+        return start, stop, step, slice_width
+
+
     @property
     def channel(self):
         return self._channel