diff --git a/src/ttmask/__init__.py b/src/ttmask/__init__.py
index 1128bf4..1c00a37 100644
--- a/src/ttmask/__init__.py
+++ b/src/ttmask/__init__.py
@@ -11,4 +11,5 @@
 
 from ._cli import cli
 from .sphere import sphere
+from .cylinder import cylinder
 
diff --git a/src/ttmask/cylinder.py b/src/ttmask/cylinder.py
new file mode 100644
index 0000000..ecd2469
--- /dev/null
+++ b/src/ttmask/cylinder.py
@@ -0,0 +1,46 @@
+import numpy as np
+import einops
+import typer
+from scipy.ndimage import distance_transform_edt
+import mrcfile
+from ._cli import cli
+
+
+@cli.command(name='cylinder')
+def cylinder(
+    boxsize: int = typer.Option(...),
+    cylinder_height: float = typer.Option(...),
+    cylinder_outer_diameter: float = typer.Option(...),
+    cylinder_inner_diameter: float = typer.Option(0),
+    soft_edge_size: int = typer.Option(...),
+):
+    cylinder_outer_radius = cylinder_outer_diameter / 2
+    cylinder_inner_radius = cylinder_inner_diameter / 2
+
+    c = boxsize // 2
+    center = np.array([c, c, c])
+    mask = np.zeros(shape=(boxsize, boxsize, boxsize))
+
+    # 3d positions of all voxels
+    positions = np.indices([boxsize, boxsize, boxsize])
+    positions = einops.rearrange(positions, 'zyx d h w -> d h w zyx')
+
+    print('calculating distance')
+    difference = np.abs(positions - center)  # (100, 100, 100, 3)
+
+    xy_distance = np.sum(difference[:, :, :, [1, 2]] ** 2, axis=-1) ** 0.5
+
+    idx_z = difference[:, :, :, 0] < cylinder_height / 2
+    idx_xy_outer = xy_distance < cylinder_outer_radius
+    idx_xy_inner = xy_distance < cylinder_inner_radius
+
+    mask[np.logical_and(idx_z, idx_xy_outer)] = 1
+    mask[np.logical_and(idx_z, idx_xy_inner)] = 0
+
+    distance_from_edge = distance_transform_edt(mask == 0)
+    boundary_pixels = (distance_from_edge <= soft_edge_size) & (distance_from_edge != 0)
+    normalised_distance_from_edge = (distance_from_edge[boundary_pixels] / soft_edge_size) * np.pi
+
+    mask[boundary_pixels] = (0.5 * np.cos(normalised_distance_from_edge) + 0.5)
+
+    mrcfile.write("cylinder.mrc", mask, voxel_size=4, overwrite=True)
diff --git a/src/ttmask/sphere.py b/src/ttmask/sphere.py
index ddf854d..8fdf5b3 100644
--- a/src/ttmask/sphere.py
+++ b/src/ttmask/sphere.py
@@ -1,7 +1,6 @@
 from ._cli import cli
 import numpy as np
 import einops
-import napari
 import typer
 from scipy.ndimage import distance_transform_edt
 import mrcfile
@@ -39,5 +38,4 @@ def sphere(
 
     mask[boundary_pixels] = (0.5 * np.cos(normalised_distance_from_edge) + 0.5)
 
-    #   mrcfile.read("bla.mrc")
     mrcfile.write("sphere.mrc", mask, voxel_size=4, overwrite=True)