diff --git a/flopy4/structured_grid.py b/flopy4/discretization/structured_grid.py
similarity index 100%
rename from flopy4/structured_grid.py
rename to flopy4/discretization/structured_grid.py
diff --git a/flopy4/mf6/codec.py b/flopy4/mf6/codec.py
new file mode 100644
index 00000000..03188c1d
--- /dev/null
+++ b/flopy4/mf6/codec.py
@@ -0,0 +1,44 @@
+import sys
+
+import numpy as np
+from jinja2 import Environment, PackageLoader
+
+from flopy4.mf6 import filters
+from flopy4.mf6.component import Component
+from flopy4.mf6.spec import blocks_dict, fields_dict
+from flopy4.uio import DEFAULT_REGISTRY
+
+JINJA_ENV = Environment(
+    loader=PackageLoader("flopy4.mf6"),
+    trim_blocks=True,
+    lstrip_blocks=True,
+)
+JINJA_ENV.filters["field_kind"] = filters.field_kind
+JINJA_ENV.filters["fieldvalue"] = filters.fieldvalue
+JINJA_ENV.filters["arraydelayed"] = filters.arraydelayed
+JINJA_ENV.filters["array2string"] = filters.array2string
+JINJA_ENV.filters["is_dict"] = filters.is_dict
+JINJA_TEMPLATE_NAME = "blocks.jinja"
+
+
+def _load_ascii(self) -> None:
+    # TODO
+    pass
+
+
+def _write_ascii(self) -> None:
+    cls = type(self)
+    fields = fields_dict(cls)
+    blocks = blocks_dict(cls)
+    template = JINJA_ENV.get_template(JINJA_TEMPLATE_NAME)
+    iterator = template.generate(fields=fields, blocks=blocks, data=unstructure(self.data))  # type: ignore
+    # are these printoptions always applicable?
+    with np.printoptions(precision=4, linewidth=sys.maxsize, threshold=sys.maxsize):
+        # TODO don't hardcode the filename, maybe a filename attribute?
+        with open(self.path / self.name, "w") as f:  # type: ignore
+            f.writelines(iterator)
+
+
+# TODO: where to do this? probably not here..on plugin discovery?
+DEFAULT_REGISTRY.register_loader(Component, "ascii", _load_ascii)
+DEFAULT_REGISTRY.register_writer(Component, "ascii", _write_ascii)
diff --git a/flopy4/mf6/component.py b/flopy4/mf6/component.py
index eefc09dd..0af0e4e1 100644
--- a/flopy4/mf6/component.py
+++ b/flopy4/mf6/component.py
@@ -6,6 +6,7 @@
 from xattree import xattree
 
 from flopy4.mf6.spec import fields_dict
+from flopy4.uio import IO, Loader, Writer
 
 COMPONENTS = {}
 """MF6 component registry."""
@@ -13,8 +14,23 @@
 
 @xattree
 class Component(ABC, MutableMapping):
+    """
+    Base class for MF6 components.
+
+    Notes
+    -----
+    All subclasses of `Component` must be decorated with `xattree`.
+
+    We use the `children` attribute provided by `xattree`. We know
+    children are also `Component`s, but mypy does not. TODO: fix??
+    """
+
+    _load = IO(Loader)  # type: ignore
+    _write = IO(Writer)  # type: ignore
+
     @classmethod
     def __attrs_init_subclass__(cls):
+        # add class to the component registry
         COMPONENTS[cls.__name__.lower()] = cls
 
     def __attrs_post_init__(self):
@@ -70,11 +86,11 @@ def _to_dfn_spec(attribute: Attribute) -> Var:
         )
 
     def load(self) -> None:
-        # TODO: load
+        self._load(format=format)
         for child in self.children.values():  # type: ignore
             child.load()
 
     def write(self) -> None:
-        # TODO: write
+        self._write(format=format)
         for child in self.children.values():  # type: ignore
             child.write()
diff --git a/flopy4/mf6/filters.py b/flopy4/mf6/filters.py
new file mode 100644
index 00000000..49f351cb
--- /dev/null
+++ b/flopy4/mf6/filters.py
@@ -0,0 +1,50 @@
+from typing import Any
+
+import numpy as np
+import xarray as xr
+from attrs import Attribute
+from jinja2 import pass_context
+from numpy.typing import NDArray
+
+
+def field_kind(field: Attribute) -> str:
+    """
+    Get a field's `xattree` kind. Kind is either:
+
+    - 'child' for child fields
+    - 'array' for array fields
+    - 'coord' for coordinate array fields
+    - 'dim' for integer fields describing a dimension's size
+    - 'attr' for all other fields
+    """
+    if (meta := field.metadata) is None:
+        raise TypeError(f"Field {field.name} has no metadata")
+    if (xatmeta := meta.get("xattree", None)) is None:
+        raise TypeError(f"Field {field.name} has no xattree metadata")
+    if "kind" not in xatmeta:
+        raise TypeError(f"Field {field.name} has no kind")
+    return xatmeta.get("kind") or "attr"
+
+
+@pass_context
+def fieldvalue(ctx, field: Attribute):
+    """Get a field's value from the data tree via the template context."""
+    return ctx["data"].attrs.get(field.name) or ctx["data"].get(field.name)
+
+
+def arraydelayed(value: xr.DataArray):
+    """Yield chunks (lines) from a Dask array."""
+    # TODO: Determine a good chunk size,
+    # because if the underlying array is only numpy, it will stay one block.
+    for chunk in value.chunk():
+        yield chunk.compute()
+
+
+def array2string(value: NDArray) -> str:
+    """Convert an array to a string."""
+    return np.array2string(value, separator=" ")[1:-1]  # remove brackets
+
+
+def is_dict(value: Any) -> bool:
+    """Check if the value is a dictionary."""
+    return isinstance(value, dict)
diff --git a/flopy4/mf6/spec.py b/flopy4/mf6/spec.py
index 8de8eb5b..a46a8385 100644
--- a/flopy4/mf6/spec.py
+++ b/flopy4/mf6/spec.py
@@ -141,7 +141,6 @@ def blocks_dict(cls) -> dict[str, Block]:
     (field) name to `attrs.Attribute`.
     """
     fields = fields_dict(cls)
-    fields = {k: v for k, v in fields.items() if "block" in v.metadata}
     blocks: dict[str, Block] = {}
     for k, v in fields.items():
         block = v.metadata["block"]
diff --git a/flopy4/mf6/templates/blocks.jinja b/flopy4/mf6/templates/blocks.jinja
new file mode 100644
index 00000000..430c524d
--- /dev/null
+++ b/flopy4/mf6/templates/blocks.jinja
@@ -0,0 +1,8 @@
+{% import 'macros.jinja' as macros with context %}
+{% for block_name, block_ in blocks.items() %}
+BEGIN {{ block_name }}
+{% for field in block_.values() %}
+{{ macros.field(field) }}
+{% endfor %}
+END {{ block_name }}
+{% endfor %}
diff --git a/flopy4/mf6/templates/macros.jinja b/flopy4/mf6/templates/macros.jinja
new file mode 100644
index 00000000..98bef7ca
--- /dev/null
+++ b/flopy4/mf6/templates/macros.jinja
@@ -0,0 +1,64 @@
+{% macro field(field) %}
+{% set kind = field|field_kind %}
+{% if kind == 'attr' %}
+{% if field.type|is_dict %}
+{{ record(field) }}
+{% else %}
+{{ scalar(field) }}
+{% endif %}
+{% elif kind in ['array', 'coord'] %}
+{{ array(field) }}
+{% elif kind == 'dim' %}
+{{ scalar(field) }}
+{% elif kind == 'child' %}
+{# TODO #}
+{% endif %}
+{%- endmacro %}
+
+{% macro scalar(field) %}
+{% set value = field|fieldvalue %}
+{% if value is not none %}
+{{ field.name }} {{ value }}
+{% endif %}
+{%- endmacro %}
+
+{% macro keystring(field) %} {# union #}
+{% for item in (field|fieldvalue).items() %}
+{{ field(item) }}
+{% endfor %}
+{%- endmacro %}
+
+{% macro record(field) %}
+{% for item in field|fieldvalue %}
+{% if item.tagged %}{{ item.name }} {% endif %}{{ field(field) }}
+{% endfor %}
+{%- endmacro %}
+
+{% macro array(field, how="internal") %}
+{% if how == "layered constant" %}
+{{ field.name }} LAYERED
+{% for val in field|fieldvalue %}
+CONSTANT
+{% endfor %}
+{% elif how == "constant" %}
+{{ field.name }} CONSTANT {{ field|fieldvalue }}
+{% elif how == "layered" %}
+{% if layered %}
+{{ field.name }}{% for val in field|fieldvalue %} {{ val }}{% endfor %}
+{% endif %}
+{% elif how == "internal" %}
+{{ field.name }} {{ internal_array(field) }}
+{% elif how == "external" %}
+{{ field.name}} OPEN/CLOSE {{ field|fieldvalue }}
+{% endif %}
+{%- endmacro %}
+
+{% macro internal_array(field) %}
+{% for chunk in field|fieldvalue|arraydelayed %}
+{{ chunk|array2string }}
+{% endfor %}
+{%- endmacro %}
+
+{% macro list(field) %}
+{# TODO #}
+{%- endmacro %}
diff --git a/flopy4/mf6/utils/cbc_reader.py b/flopy4/mf6/utils/cbc_reader.py
index feb76061..932af903 100644
--- a/flopy4/mf6/utils/cbc_reader.py
+++ b/flopy4/mf6/utils/cbc_reader.py
@@ -12,7 +12,7 @@
 from attrs import define
 from flopy.discretization import StructuredGrid
 
-from flopy4.structured_grid import StructuredGridWrapper
+from flopy4.discretization.structured_grid import StructuredGridWrapper
 
 from .grid_utils import get_coords
 
diff --git a/flopy4/uio.py b/flopy4/uio.py
new file mode 100644
index 00000000..de687acd
--- /dev/null
+++ b/flopy4/uio.py
@@ -0,0 +1,119 @@
+"""
+Unified IO framework. Program interfaces can plug in custom
+load/write routines for pairs of component class and format.
+
+Most of this module is stolen/simplified from astropy, at:
+- https://github.com/astropy/astropy/tree/main/astropy/io.
+"""
+
+__all__ = ["IO", "Loader", "Writer", "DEFAULT_REGISTRY"]
+
+
+from typing import Literal
+
+
+class Registry:
+    """
+    Registry for IO operations. Loaders and writers
+    are registered by format and the class they are
+    associated with.
+    """
+
+    def __init__(self):
+        self._loaders = {}
+        self._writers = {}
+
+    def get_loader(self, cls, format=None):
+        return next(
+            iter(
+                [
+                    fn
+                    for ((fmt, cls_), fn) in self._loaders.items()
+                    if fmt == format and issubclass(cls, cls_)
+                ]
+            )
+        )
+
+    def get_writer(self, cls, format=None):
+        return next(
+            iter(
+                [
+                    fn
+                    for ((fmt, cls_), fn) in self._writers.items()
+                    if fmt == format and issubclass(cls, cls_)
+                ]
+            )
+        )
+
+    def register_loader(self, cls, format, function):
+        if format in self._loaders:
+            raise ValueError(f"Loader for format {format} already registered.")
+        self._loaders[cls, format] = (cls, function)
+
+    def register_writer(self, cls, format, function):
+        if format in self._writers:
+            raise ValueError(f"Writer for format {format} already registered.")
+        self._writers[cls, format] = (cls, function)
+
+    def load(self, cls, *args, format=None, **kwargs):
+        return self.get_loader(cls, format)(*args, **kwargs)
+
+    def write(self, cls, *args, format=None, **kwargs):
+        return self.get_writer(cls, format)(*args, **kwargs)
+
+
+DEFAULT_REGISTRY = Registry()
+
+
+Op = Literal["load", "write"]
+
+
+class IO(property):
+    """Wrap a file IO descriptor as a property."""
+
+    def __get__(self, instance, owner_cls):
+        return self.fget(instance, owner_cls)
+
+
+class IODescriptor:
+    """Base class for file IO operations, implemented as descriptors."""
+
+    def __init__(self, instance, cls, op: Op, registry: Registry | None = None):
+        self._registry = registry or DEFAULT_REGISTRY
+        self._instance = instance
+        self._cls = cls
+        self._op: Op = op
+
+    @property
+    def registry(self):
+        return self._registry
+
+    def list_formats(self, out=None):
+        formats = self._registry.get_formats(self._cls, self._op)
+
+        if out is None:
+            formats.pprint(max_lines=-1, max_width=-1)
+        else:
+            out.write("\n".join(formats.pformat(max_lines=-1, max_width=-1)))
+
+        return out
+
+
+class Loader(IODescriptor):
+    """Descriptor for loading data from file."""
+
+    def __init__(self, instance, cls):
+        super().__init__(instance, cls, "load", registry=None)
+
+    def __call__(self, *args, **kwargs) -> None:
+        return self.registry.load(self._cls, *args, **kwargs)
+
+
+class Writer(IODescriptor):
+    """Descriptor for writing data to file."""
+
+    def __init__(self, instance, cls):
+        super().__init__(instance, cls, "write", registry=None)
+
+    def __call__(self, *args, **kwargs) -> None:
+        return self.registry.write(self._cls, *args, **kwargs)
diff --git a/pixi.lock b/pixi.lock
index 755bb8fa..6758567c 100644
--- a/pixi.lock
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+      - pypi: https://files.pythonhosted.org/packages/2c/a9/a7022f58e081149ec0184c31ea81dcee605e1d46380b48122e1ef94ac24e/fsspec-2025.5.0-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/a0/61/5c78b91c3143ed5c14207f463aecfc8f9dbb5092fb2869baf37c273b2705/gitdb-4.0.12-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/1d/9a/4114a9057db2f1462d5c8f8390ab7383925fe1ac012eaa42402ad65c2963/GitPython-3.1.44-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/04/4b/29cac41a4d98d144bf5f6d33995617b185d14b22401f75ca86f384e87ff1/h11-0.16.0-py3-none-any.whl
@@ -2436,7 +2436,7 @@ environments:
       - pypi: https://files.pythonhosted.org/packages/5a/84/44687a29792a70e111c5c477230a72c4b957d88d16141199bf9acb7537a3/websocket_client-1.8.0-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/ca/51/5447876806d1088a0f8f71e16542bf350918128d0a69437df26047c8e46f/widgetsnbextension-4.0.14-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/a4/1e/96fd96419fec1a37da998a1ca3d558f2cae2f6f3cd5015170371b05a2b6b/xarray-2025.4.0-py3-none-any.whl
-      - pypi: git+https://github.com/modflowpy/xattree.git#2a4e5a06299bbf95a308c98815dfde04a6b83dd4
+      - pypi: git+https://github.com/modflowpy/xattree.git#abf7bd9b541c4db30f49b38c5a029a9b0050ab2f
       - pypi: https://files.pythonhosted.org/packages/d6/7d/b77455d7c7c51255b2992b429107fab811b2e36ceaf76da1e55a045dc568/xyzservices-2025.4.0-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/00/3b/e20bdf84088c11f2c396d034506cbffadd53e024111c1aa4585c2aba1523/zarr-3.0.8-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/80/ab/11a76c1e2126084fde2639514f24e6111b789b0bfa4fc6264a8975c7e1f1/zict-3.0.0-py2.py3-none-any.whl
@@ -2495,7 +2495,7 @@ environments:
       - pypi: https://files.pythonhosted.org/packages/a6/29/489532138735b4098e58f25485947e2b5233686883d1b0875bf4f8549583/flopy-3.9.3-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/8f/ee/e4aa7bb4ce510ad57a808d321df1bbed1eeb6e1dfb20aaee1a5d9c076849/fonttools-4.58.0-cp313-cp313-win_amd64.whl
       - pypi: https://files.pythonhosted.org/packages/cf/58/8acf1b3e91c58313ce5cb67df61001fc9dcd21be4fadb76c1a2d540e09ed/fqdn-1.5.1-py3-none-any.whl
-      - pypi: https://files.pythonhosted.org/packages/bb/61/78c7b3851add1481b048b5fdc29067397a1784e2910592bc81bb3f608635/fsspec-2025.5.1-py3-none-any.whl
+      - pypi: https://files.pythonhosted.org/packages/2c/a9/a7022f58e081149ec0184c31ea81dcee605e1d46380b48122e1ef94ac24e/fsspec-2025.5.0-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/a0/61/5c78b91c3143ed5c14207f463aecfc8f9dbb5092fb2869baf37c273b2705/gitdb-4.0.12-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/1d/9a/4114a9057db2f1462d5c8f8390ab7383925fe1ac012eaa42402ad65c2963/GitPython-3.1.44-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/04/4b/29cac41a4d98d144bf5f6d33995617b185d14b22401f75ca86f384e87ff1/h11-0.16.0-py3-none-any.whl
@@ -2622,7 +2622,7 @@ environments:
       - pypi: https://files.pythonhosted.org/packages/5a/84/44687a29792a70e111c5c477230a72c4b957d88d16141199bf9acb7537a3/websocket_client-1.8.0-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/ca/51/5447876806d1088a0f8f71e16542bf350918128d0a69437df26047c8e46f/widgetsnbextension-4.0.14-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/a4/1e/96fd96419fec1a37da998a1ca3d558f2cae2f6f3cd5015170371b05a2b6b/xarray-2025.4.0-py3-none-any.whl
-      - pypi: git+https://github.com/modflowpy/xattree.git#2a4e5a06299bbf95a308c98815dfde04a6b83dd4
+      - pypi: git+https://github.com/modflowpy/xattree.git#abf7bd9b541c4db30f49b38c5a029a9b0050ab2f
       - pypi: https://files.pythonhosted.org/packages/d6/7d/b77455d7c7c51255b2992b429107fab811b2e36ceaf76da1e55a045dc568/xyzservices-2025.4.0-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/00/3b/e20bdf84088c11f2c396d034506cbffadd53e024111c1aa4585c2aba1523/zarr-3.0.8-py3-none-any.whl
       - pypi: https://files.pythonhosted.org/packages/80/ab/11a76c1e2126084fde2639514f24e6111b789b0bfa4fc6264a8975c7e1f1/zict-3.0.0-py2.py3-none-any.whl
@@ -3542,16 +3542,16 @@ packages:
   version: 2.7.1
   sha256: 8c03286b1e5ce9bed7090084f206aacd87c5146b4b10de56fe9e86cbbbf851cf
   requires_python: '>=3.7'
-- pypi: https://files.pythonhosted.org/packages/8b/50/f256ab79c671fb066e47336706dc398c3b1e125f952e07d54ce82cf4011a/cryptography-45.0.3-cp311-abi3-manylinux_2_28_x86_64.whl
+- pypi: https://files.pythonhosted.org/packages/fe/24/f19aae32526cc55ae17d473bc4588b1234af2979483d99cbfc57e55ffea6/cryptography-45.0.2-cp311-abi3-manylinux_2_28_x86_64.whl
   name: cryptography
-  version: 45.0.3
-  sha256: 2f8f8f0b73b885ddd7f3d8c2b2234a7d3ba49002b0223f58cfde1bedd9563c56
+  version: 45.0.2
+  sha256: e9e4bdcd70216b08801e267c0b563316b787f957a46e215249921f99288456f9
   requires_dist:
   - cffi>=1.14 ; platform_python_implementation != 'PyPy'
   - bcrypt>=3.1.5 ; extra == 'ssh'
   - nox>=2024.4.15 ; extra == 'nox'
   - nox[uv]>=2024.3.2 ; python_full_version >= '3.8' and extra == 'nox'
-  - cryptography-vectors==45.0.3 ; extra == 'test'
+  - cryptography-vectors==45.0.2 ; extra == 'test'
   - pytest>=7.4.0 ; extra == 'test'
   - pytest-benchmark>=4.0 ; extra == 'test'
   - pytest-cov>=2.10.1 ; extra == 'test'
@@ -3900,7 +3900,7 @@ packages:
 - pypi: .
   name: flopy4
   version: 0.0.1.dev0
-  sha256: b0e87678a21f0f7d64da1174a4acf39a7e1588830a6d4a3e030492a904d6b14c
+  sha256: 3d88c4f59326a6864ec4c4ba8a7ecb7593cf723c55164301b54ebf9245221e25
   requires_dist:
   - attrs
   - cattrs
@@ -4269,10 +4269,10 @@ packages:
   requires_dist:
   - cached-property>=1.3.0 ; python_full_version < '3.8'
   requires_python: '>=2.7,!=3.0,!=3.1,!=3.2,!=3.3,!=3.4,<4'
-- pypi: https://files.pythonhosted.org/packages/bb/61/78c7b3851add1481b048b5fdc29067397a1784e2910592bc81bb3f608635/fsspec-2025.5.1-py3-none-any.whl
+- pypi: https://files.pythonhosted.org/packages/2c/a9/a7022f58e081149ec0184c31ea81dcee605e1d46380b48122e1ef94ac24e/fsspec-2025.5.0-py3-none-any.whl
   name: fsspec
-  version: 2025.5.1
-  sha256: 24d3a2e663d5fc735ab256263c4075f374a174c3410c0b25e5bd1970bceaa462
+  version: 2025.5.0
+  sha256: 0ca253eca6b5333d8a2b8bd98c7326fe821f1f0fdbd34e1b445bddde8e804c95
   requires_dist:
   - adlfs ; extra == 'abfs'
   - adlfs ; extra == 'adl'
@@ -4532,10 +4532,10 @@ packages:
   - pretend ; extra == 'test'
   - coverage[toml] ; extra == 'test'
   requires_python: '>=3.8'
-- pypi: https://files.pythonhosted.org/packages/7a/cd/18f8da995b658420625f7ef13f037be53ae04ec5ad33f9b718240dcfd48c/identify-2.6.12-py2.py3-none-any.whl
+- pypi: https://files.pythonhosted.org/packages/2b/d3/85feeba1d097b81a44bcffa6a0beab7b4dfffe78e82fc54978d3ac380736/identify-2.6.10-py2.py3-none-any.whl
   name: identify
-  version: 2.6.12
-  sha256: ad9672d5a72e0d2ff7c5c8809b62dfa60458626352fb0eb7b55e69bdc45334a2
+  version: 2.6.10
+  sha256: 5f34248f54136beed1a7ba6a6b5c4b6cf21ff495aac7c359e1ef831ae3b8ab25
   requires_dist:
   - ukkonen ; extra == 'license'
   requires_python: '>=3.9'
@@ -9895,7 +9895,7 @@ packages:
   - types-pytz ; extra == 'types'
   - types-setuptools ; extra == 'types'
   requires_python: '>=3.10'
-- pypi: git+https://github.com/modflowpy/xattree.git#2a4e5a06299bbf95a308c98815dfde04a6b83dd4
+- pypi: git+https://github.com/modflowpy/xattree.git#abf7bd9b541c4db30f49b38c5a029a9b0050ab2f
   name: xattree
   version: 0.1.0.dev0
   requires_dist:
diff --git a/pyproject.toml b/pyproject.toml
index e14c62ce..c46c51ce 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -34,8 +34,8 @@ classifiers = [
 ]
 requires-python = ">=3.11"
 dependencies = [
-    "attrs",                                                                            # todo: bounds?
-    "cattrs",                                                                           # todo: bounds?
+    "attrs",
+    "cattrs",
     "flopy",
     "Jinja2>=3.0",
     "numpy>=1.20.3",
diff --git a/test/test_component.py b/test/test_component.py
index 19614f13..5a79b6e8 100644
--- a/test/test_component.py
+++ b/test/test_component.py
@@ -1,3 +1,5 @@
+from pathlib import Path
+
 import numpy as np
 import pytest
 from flopy.discretization import StructuredGrid
@@ -268,3 +270,20 @@ def test_ims_dfn():
     assert dfn["sln"] == Sln(abbr="ims", pattern="*")
     assert "complexity" in set(dfn["options"].keys())
     assert "inner_maximum" in set(dfn["linear"].keys())
+
+
+@pytest.mark.xfail(reason="TODO")
+def test_write_ascii(tmp_path):
+    time = ModelTime(perlen=[1.0], nstp=[1], tsmult=[1.0])
+    grid = StructuredGrid(nlay=1, nrow=10, ncol=10)
+    sim = Simulation(tdis=time, path=tmp_path)
+    gwf = Gwf(parent=sim, dis=grid)
+    ic = Ic(parent=gwf)
+    oc = Oc(parent=gwf)
+    npf = Npf(parent=gwf)
+    chd = Chd(parent=gwf, head={"*": {(0, 0, 0): 1.0, (0, 9, 9): 0.0}})
+
+    sim.write("ascii")
+
+    files = Path(tmp_path).glob("*")
+    assert "mfsim.nam" in files
diff --git a/test/test_jinja.py b/test/test_jinja.py
new file mode 100644
index 00000000..0be00bf7
--- /dev/null
+++ b/test/test_jinja.py
@@ -0,0 +1,51 @@
+from pathlib import Path
+
+from flopy.discretization import StructuredGrid
+from flopy.discretization.modeltime import ModelTime
+from jinja2 import Environment, PackageLoader
+
+from flopy4.mf6 import filters
+from flopy4.mf6.gwf import Chd, Gwf, Npf, Oc
+from flopy4.mf6.ims import Ims
+from flopy4.mf6.simulation import Simulation
+from flopy4.mf6.spec import blocks_dict, fields_dict
+
+
+def test_simulation_to_jinja():
+    name = "quickstart"
+    workspace = Path(__file__).parent / name
+    time = ModelTime(perlen=[1.0], nstp=[1])
+    grid = StructuredGrid(nlay=1, nrow=10, ncol=10)
+    sim = Simulation(name=name, path=workspace, tdis=time)
+    ims = Ims(parent=sim)
+    gwf_name = "mymodel"
+    gwf = Gwf(parent=sim, name=gwf_name, save_flows=True, dis=grid)
+    npf = Npf(parent=gwf, save_specific_discharge=True)
+    chd = Chd(
+        parent=gwf,
+        head={"*": {(0, 0, 0): 1.0, (0, 9, 9): 0.0}},
+    )
+    oc = Oc(
+        parent=gwf,
+        budget_file=f"{gwf.name}.bud",
+        head_file=f"{gwf.name}.hds",
+        save_head={"*": "all"},
+        save_budget={"*": "all"},
+    )
+
+    env = Environment(
+        loader=PackageLoader("flopy4.mf6"),
+        trim_blocks=True,
+        lstrip_blocks=True,
+    )
+    env.filters["field_kind"] = filters.field_kind
+    env.filters["fieldvalue"] = filters.fieldvalue
+    env.filters["arraydelayed"] = filters.arraydelayed
+    env.filters["array2string"] = filters.array2string
+    env.filters["is_dict"] = filters.is_dict
+
+    fields = fields_dict(Oc)
+    blocks = blocks_dict(Oc)
+    result = env.get_template("blocks.jinja").render(fields=fields, blocks=blocks, data=oc.data)
+    print(result)
+    assert result != ""
diff --git a/uv.lock b/uv.lock
index 0bdc471d..8c8ab952 100644
--- a/uv.lock
+++ b/uv.lock
@@ -875,35 +875,35 @@ provides-extras = ["dev", "lint", "test", "build"]
 
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 name = "fonttools"
-version = "4.58.0"
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-wheels = [
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