pythonscad-gridfinity

A Python library for generating Gridfinity-compatible baseplates and bins using PythonSCAD.

Gallery

These previews are generated by the deterministic scripts/render_gallery_*.py models using PythonSCAD.

pythonscad --trust-python --backend=Manifold \
  -o baseplate.stl scripts/render_gallery_baseplate.py

Baseplate	Standard bin	Vase-mode bin

Dependencies

• Runtime: PythonSCAD 1.1.0 or newer (pythonscad>=1.1.0 on PyPI)
• Python: 3.10+

The library imports gridfinity in PythonSCAD scripts. Geometry is built with PythonSCAD's pythonscad module (from pythonscad import * in examples).

Installation

pip install pythonscad-gridfinity

For development:

git clone https://github.com/nomike/pythonscad-gridfinity.git
cd pythonscad-gridfinity
uv sync --all-groups

When opening examples from a clone without installing, add src/ to the path (see examples/basic_baseplate.py).

Use it as a project dependency

Put this in requirements.txt:

pythonscad-gridfinity

Or add it to another project's pyproject.toml:

[project]
dependencies = [
  "pythonscad-gridfinity",
]

Usage

from pythonscad import *
from gridfinity import GridfinityBaseplate, GridfinityBin, HoleOptions

bp = GridfinityBaseplate(2, 2, style="weighted",
                         hole_options=HoleOptions(magnet_hole=True))
bp.render().color("SteelBlue").show()

b = GridfinityBin(2, 1, 3, div_x=2, scoop=1.0)
b.render().color("Tomato").show()

Export without the GUI:

pythonscad --trust-python -o baseplate.stl my_script.py

What is this?

Gridfinity is a modular storage system created by Zack Freedman. It uses a standardised grid of interlocking baseplates and bins to organise tools, parts, and other small items.

PythonSCAD is a fork of OpenSCAD that adds a native Python API for programmatic 3D modelling. This library lets you generate Gridfinity objects directly from Python scripts inside PythonSCAD.

Features

Baseplates

• Five baseplate styles: thin, weighted, skeletonized, screw-together, and screw-together-minimal.
• Configurable magnet holes (6 mm x 2 mm) with optional crush ribs, chamfer, and supportless printing.
• Gridfinity Refined side-insert magnet holes.
• M3 screw holes with countersink or counterbore options.
• Fit-to-drawer mode with configurable padding alignment.
• Screw-together channels for joining multiple baseplates.

Bins

• Configurable grid size (X, Y) and height (in Gridfinity units, internal mm, or external mm).
• Equal compartments via div_x / div_y dividers.
• Custom compartment layouts with arbitrary placement and per-compartment scoop / tab control via the Compartment class.
• Finger scoops (adjustable weight 0--1).
• Label tabs (full, auto, left, center, right, or none).
• Stacking lip (normal, reduced, or none).
• Lite bins with hollow shell bases for faster printing and less material.
• Half-grid bins with 21 mm base units (half the standard 42 mm).
• Cylindrical cutouts for tool holders (chamfered cylinder holes).
• Z-snap to round height to the nearest 7 mm increment.
• Only-corners hole placement to save print time.
• Compartment depth override.
• Tab placement control (everywhere or top-left only).
• Gridfinity Refined thumbscrew holes (M15 x 1.5 compatible) for secure baseplate attachment.
• Scoop chamfer for easier part removal.
• Solid bin option with configurable fill ratio.
• Bottom magnet/screw holes (same options as baseplates).
• Interior edge fillets using PythonSCAD's native .fillet().

Spiral / vase-mode bins

• Bins designed for spiral (vase) mode printing with single-wall extrusions.
• Configurable nozzle width and layer height.
• Single-wall dividers.
• Magic slice for slicer compatibility.
• Base cross pattern for baseplate attachment.
• Scoop chamfer on the front wall for easy part removal.
• Lip pinch for added structural strength.
• Front inset for reinforcement at the scoop area.

Hole options

• Standard magnet holes
• Crush-rib press-fit magnet holes
• Chamfered holes for easy magnet insertion
• Supportless (bridged) holes for printing without supports
• Gridfinity Refined friction-fit holes
• Underside screw mounting (countersink / counterbore)

Architecture

• All Gridfinity standard dimensions are encoded in a single GridfinitySpec class, making it easy to reference or override measurements.
• Clean Python API using dataclasses, operator overloading (|, -), and PythonSCAD convenience methods (.up(), .rotz(), etc.).

Installation (legacy clone layout)

When not using pip install, add the src/ directory from a clone:

import sys
import os
from pythonscad import *

sys.path.insert(0, os.path.join("/path/to/pythonscad-gridfinity", "src"))

from gridfinity import GridfinityBaseplate, HoleOptions

If your script lives inside the repository (e.g. in examples/), use modelpath() for a relative path:

import sys
import os
from pythonscad import *

root = os.path.dirname(os.path.dirname(os.path.abspath(modelpath())))
sys.path.insert(0, os.path.join(root, "src"))

from gridfinity import GridfinityBaseplate, HoleOptions

Quick start

Thin baseplate (1 x 1)

from pythonscad import *
from gridfinity import GridfinityBaseplate

bp = GridfinityBaseplate(1, 1, style="thin")

Weighted baseplate with magnet holes (4 x 3)

from gridfinity import GridfinityBaseplate, HoleOptions

bp = GridfinityBaseplate(
    4, 3,
    style="weighted",
    hole_options=HoleOptions(magnet_hole=True, crush_ribs=True, chamfer=True),
)
bp.render().color("SteelBlue").show()

Skeletonized baseplate (2 x 2)

from gridfinity import GridfinityBaseplate, HoleOptions

bp = GridfinityBaseplate(
    2, 2,
    style="skeleton",
    hole_options=HoleOptions(magnet_hole=True),
)
bp.render().show()

Simple bin (2 x 1, 3U)

from gridfinity import GridfinityBin

b = GridfinityBin(2, 1, 3)
b.render().color("SteelBlue").show()

Bin with compartments, scoops, and tabs (3 x 2, 6U)

from gridfinity import GridfinityBin, HoleOptions

b = GridfinityBin(
    3, 2, 6,
    div_x=3, div_y=2,
    scoop=1.0,
    tab_style="auto",
    hole_options=HoleOptions(magnet_hole=True),
)
b.render().color("Tomato").show()

Custom compartment layout (3 x 2, 6U)

from gridfinity import GridfinityBin, Compartment, HoleOptions

b = GridfinityBin(
    3, 2, 6,
    compartments=[
        Compartment(0, 0, 2, 2, scoop=1.0, tab_style="left"),
        Compartment(2, 0, 1, 1, scoop=0.5, tab_style="right"),
        Compartment(2, 1, 1, 1, scoop=0.0, tab_style="none"),
    ],
    hole_options=HoleOptions(magnet_hole=True),
)
b.render().color("CadetBlue").show()

Lite bin with hollow base (2 x 2, 6U)

from gridfinity import GridfinityBin, HoleOptions

b = GridfinityBin(
    2, 2, 6,
    div_x=2, div_y=2,
    lite=True,
    base_thickness=1.0,
    hole_options=HoleOptions(magnet_hole=True),
)
b.render().color("LightCoral").show()

Spiral/vase-mode bin (2 x 1, 6U)

from gridfinity import GridfinityVaseBin

v = GridfinityVaseBin(2, 1, 6, n_divx=2, nozzle=0.4)
v.render().color("Tomato").show()

Baseplate styles

Hole option details

The HoleOptions dataclass controls magnet and screw hole features:

Bin options

Tab styles

Tabs are automatically disabled when the bin is shorter than 3 height units.

Lip styles

Height modes

API reference

GridfinitySpec

All Gridfinity standard dimensions as class-level constants. Key values:

• GRID_SIZE = 42.0 -- one grid unit in mm
• BASEPLATE_HEIGHT = 5.0 -- minimum baseplate height
• MAGNET_HOLE_RADIUS = 3.25 -- for 6 mm magnets
• SCREW_HOLE_RADIUS = 1.5 -- M3 screw

See spec.py for the full list.

GridfinityBaseplate

GridfinityBaseplate(
    grid_x, grid_y,
    spec=None,              # GridfinitySpec instance (default: standard)
    style="thin",           # One of: thin, weighted, skeleton, screw_together, screw_together_minimal
    hole_options=None,      # HoleOptions instance
    screw_style="none",     # Underside mounting: none, countersink, counterbore
    min_size_mm=(0, 0),     # Minimum size for fit-to-drawer
    fit_offset=(0, 0),      # Padding alignment (-1..1 per axis)
    screw_diameter=3.35,    # Screw-together channel diameter
    screw_head_diameter=5.0,
    screw_spacing=0.5,
    n_screws=1,             # Screws per grid edge (1-3)
)

Call .render() to get a PythonSCAD 3D object, then .show() or .export().

GridfinityBin

GridfinityBin(
    grid_x, grid_y, height_u,
    spec=None,              # GridfinitySpec instance (default: standard)
    div_x=1,                # Compartments along X (1 = no dividers)
    div_y=1,                # Compartments along Y (1 = no dividers)
    scoop=1.0,              # Scoop weight (0.0 = off, 1.0 = full)
    tab_style="auto",       # One of: full, auto, left, center, right, none
    lip_style="normal",     # One of: normal, reduced, none
    hole_options=None,       # HoleOptions instance for bottom holes
    height_mode="units",    # One of: units, mm_internal, mm_external
    solid=False,            # Fill the interior (no compartments)
    solid_ratio=1.0,        # Fill fraction when solid (0.0--1.0)
    compartments=None,      # List of Compartment objects (overrides div_x/div_y)
    lite=False,             # Hollow shell base for faster printing
    base_thickness=1.0,     # Bottom thickness in mm (lite bins only)
    half_grid=False,        # Use 21 mm (half-size) bases; implies only_corners holes
    cut_cylinders=False,    # Cylindrical cutouts instead of compartments
    cylinder_diameter=10.0, # Diameter of cylindrical cutouts (mm)
    cylinder_chamfer=0.5,   # Chamfer radius around top rim (mm)
    enable_zsnap=False,     # Snap height to nearest 7 mm increment
    only_corners=False,     # Holes at corners only (saves print time)
    depth=0,                # Override compartment depth in mm (0 = full)
    place_tab="everywhere", # "everywhere" or "top_left"
    enable_thumbscrew=False,# M15x1.5 thumbscrew hole in each base unit
    scoop_chamfer=False,    # 45-degree chamfer at top of scoop
)

Call .render() to get a PythonSCAD 3D object, then .show() or .export().

GridfinityVaseBin

GridfinityVaseBin(
    grid_x, grid_y, height_u,
    spec=None,              # GridfinitySpec instance (default: standard)
    nozzle=0.6,             # Nozzle width in mm (walls = 2 * nozzle)
    layer_height=0.35,      # Slicer layer height in mm
    bottom_layers=3,        # Number of solid bottom layers
    n_divx=1,               # Number of X compartments (single-wall dividers)
    enable_lip=True,        # Include stacking lip
    enable_holes=True,      # Magnet holes in the base
    enable_zsnap=False,     # Snap height to nearest 7 mm increment
    enable_scoop_chamfer=True,  # Front wall chamfer for easy part removal
    enable_pinch=True,      # Pinch lip for structural strength
    enable_front_inset=True,# Front reinforcement when scoop is present
)

Call .render() to get a PythonSCAD 3D object. Print in spiral/vase mode.

Compartment

Defines a single compartment in a custom layout. Positions and sizes are in fractional grid units relative to the bin's grid_x / grid_y.

Compartment(
    x,                      # Grid X position of left edge
    y,                      # Grid Y position of front edge
    w,                      # Grid width (X)
    h,                      # Grid depth (Y)
    scoop=None,             # Scoop weight 0.0--1.0 (None inherits from bin)
    tab_style=None,         # Tab style (None inherits from bin)
)

HoleOptions

See the Hole option details table above.

Helper functions

The library also exposes lower-level building blocks in case you want to compose custom objects:

• block_base_hole(options, spec) -- single combined magnet/screw hole
• hole_pattern(obj, spec) -- place an object at the four hole positions
• refined_hole(spec) -- Gridfinity Refined magnet hole geometry
• cut_chamfered_cylinder(radius, depth, chamfer_radius, cut_lip) -- chamfered cylindrical cutout for tool holders

Project structure

pythonscad-gridfinity/
  src/gridfinity/
    __init__.py       # Package exports
    spec.py           # GridfinitySpec (all standard dimensions)
    helpers.py        # Utility functions (rounded_square, pattern_grid, etc.)
    holes.py          # HoleOptions and hole geometry builders
    baseplate.py      # GridfinityBaseplate class
    bin.py            # GridfinityBin class
    vase.py           # GridfinityVaseBin class (spiral/vase mode)
  examples/
    basic_baseplate.py
    basic_bin.py
    vase_bin.py
  scripts/
    render_gallery_*.py
  tests/
  pyproject.toml
  LICENSE
  README.md

Development

See CONTRIBUTING.md for setup and checks, VERSIONING.md for releases, and PUBLISHING.md for GitHub and PyPI trusted publishing.

Running from the command line

You can render and export baseplates without opening the PythonSCAD GUI:

pythonscad --trust-python -o baseplate.stl my_baseplate_script.py

The --trust-python flag is required to enable the Python interpreter.

Acknowledgements

This library would not exist without the following projects and people:

• Zack Freedman for designing the Gridfinity modular storage system and releasing it to the community.

• gridfinity-rebuilt-openscad by kennetek -- the definitive OpenSCAD implementation of the Gridfinity standard. This library's grid dimensions, base/lip profile geometry, stacking lip cross-section, baseplate styles (thin, weighted, skeleton, screw-together), bin construction (wall heights, compartment dividers, finger scoops, label tabs), and hole specifications (magnet, screw, crush-rib, supportless, and Gridfinity Refined) are all derived from gridfinity-rebuilt-openscad.

• cq-gridfinity by Michael Gale -- a CadQuery/Python implementation of Gridfinity. Used as an additional reference for cross-checking geometry calculations and for informing the Python-oriented API design of this library.

• PythonSCAD for making Python-based 3D modelling possible with a native Python API on top of the OpenSCAD engine.

License

BSD 3-Clause