What Is Gridfinity and How Do You Create Custom Gridfinity Designs?

Updated

Gridfinity is an open, modular storage system for 3D printing: a grid of baseplates that hold interchangeable bins, so you can organize a drawer, desk, or workbench with parts that all fit together. You create custom designs by generating a baseplate or bin at the grid size you need and exporting it as an STL for printing. The main constraint is dimensional consistency — if your baseplate and bins follow the same grid unit and base profile, any part works with any other. Browser-based generators such as Extrabold Tools let you produce these files without prior CAD experience.

What Gridfinity actually is

Gridfinity is a standardized grid, not a single product. It defines:

  • A baseplate with a repeating pattern of square cells, each cell holding one "unit" of storage.
  • Bins and holders whose bases drop into those cells and lock in place.
  • A common grid unit, so a bin that occupies 2×3 cells fits any baseplate with at least that much free space.

Because the standard is open, thousands of community designs exist, and parts from different designers interoperate as long as they respect the same grid and base geometry. That interoperability is the reason makers use it: you print one baseplate, then add or replace bins over time without reprinting the whole system.

The dimensions that keep parts compatible

Compatibility comes down to a small set of measurements. Exact values vary by the specific standard revision you follow, so treat these as the categories you must match rather than fixed numbers to copy blindly:

Element What it controls Why it matters
Grid unit (cell pitch) Spacing between cell centers Determines whether a bin lands in the right cell
Base profile (footprint and taper) How a bin's base seats in a cell Mismatched profiles cause wobble or no fit
Bin outer dimensions Footprint of a bin spanning N cells Must equal N × grid unit minus clearance
Height increment Vertical stacking step Keeps stacked or adjacent bins level
Clearance / tolerance Gap between parts Too tight jams, too loose rattles

The practical rule: pick one standard revision and generate every part against it. Mixing parts generated to different revisions is the most common source of "it almost fits" failures.

Generating custom baseplates and bins in a browser

Browser-based generators handle the geometry so you only choose parameters. The general workflow:

  1. Open the generator for the part type you want — baseplate, bin, or a specific holder. Extrabold Tools describes itself as browser-based 3D generation tools for makers and 3D printing enthusiasts, with custom Gridfinity baseplates and storage solutions among its tools, and states no experience is required.
  2. Set the grid size. Choose how many cells wide and deep the part should be. A baseplate might be 5×5 cells; a bin might be 2×1.
  3. Set the height. Choose the bin height in height increments so it matches your drawer or shelf clearance.
  4. Adjust options the tool exposes — for example wall thickness, label tabs, or dividers, depending on the generator.
  5. Generate and preview the model in the browser.
  6. Export the STL and download it.

The input is your parameter set; the action is generation; the expected result is a downloadable STL whose base matches the grid you selected. If the preview looks wrong, the cause is almost always a parameter mismatch, not a rendering bug.

Choosing grid size, height, and baseplate options

There is no single correct configuration — it depends on what you are storing and where.

  • Grid size: Measure the drawer or surface first. A baseplate that is one cell too large will not fit, and trimming it after printing is difficult. Prefer a baseplate that fills the space with a small margin.
  • Bin height: Match the tallest item you plan to store in that bin, then add a little headroom so you can reach in. If the drawer has a lid or the shelf above is low, height is your hard limit.
  • Baseplate vs. individual bases: A full baseplate is faster to place and keeps alignment; separate bases or magnetic options suit surfaces where you want to rearrange cells.
  • Open bins vs. divided bins: Divided bins cost more print time and material but stop small parts from mixing.

If you are unsure, start with one small baseplate and a couple of bins, print them, and confirm the fit before committing to a large layout.

Exporting and printing successfully

Once you have an STL:

  1. Slice it in your usual slicer with the profile for your printer and filament.
  2. Check the first layer. Gridfinity parts depend on a flat, accurate base, so a good first layer matters more than on decorative prints.
  3. Print a test piece first if you changed any tolerance-related setting, and test-fit it against an existing part.
  4. Verify fit before printing a full set. A single bin is a cheap way to catch a mismatch.

Common mistakes that break compatibility:

  • Generating a bin and a baseplate from different standard revisions.
  • Scaling the model in the slicer to "make it fit" — this changes the grid unit and breaks interoperability.
  • Ignoring printer tolerance: a printer that prints slightly oversize can make tight clearances unusable, so test and adjust clearance rather than scaling the whole part.
  • Choosing bin heights that exceed the available vertical space.

Where to start

If you have no CAD experience, use a browser-based generator rather than modeling from scratch — it enforces the grid for you. Extrabold Tools is one such option, offering Gridfinity baseplate and storage generators that run in the browser and export STL files; its site notes models are licensed under CC0 1.0 Universal unless specified otherwise, and lists a guide and version history among its resources. Start with a single baseplate and one bin, confirm they fit, then expand your layout from there.