Your Lego Collection Deserves Better Than a Big Plastic Tub

Every Lego builder knows the feeling: you need one specific 2x4 brick in dark bluish gray, and it is buried somewhere in a 10,000-piece bin. You spend more time digging than building. Tackle boxes help, but they are rigid, waste space, and can not grow with your collection. What if you could 3D print custom sorting bins sized to your exact parts, your exact drawers, and rearrange them whenever your collection changes?

That is exactly what Gridfinity was built for — and it works remarkably well for Lego sorting. In this guide, we will walk through how to use Gridfinity bins to organize your brick collection, what makes it better than off-the-shelf solutions, and how to generate custom tray layouts from a single photo.

What Is Gridfinity (and Why Lego Builders Love It)

Gridfinity is a free, open-source modular storage system designed by Zack Freedman in 2022. It uses a standardized 42mm grid: baseplates sit in your drawers, and bins snap into them with a simple interlocking profile. Every bin is compatible with every baseplate, so you can rearrange your entire layout in seconds without tools.

For Lego builders, this matters because collections are never static. You buy a new set, you get a bulk lot, you sort by color one month and by part type the next. Gridfinity lets you swap bins around freely — pull out a single bin of 1x2 plates, use it at your build table, and snap it back when you are done. No other system offers that flexibility at this price point.

How to Sort Lego With Gridfinity: A Practical Approach

The best Lego sorting strategy depends on the size of your collection. Here is a progression that works well with Gridfinity:

Under 5,000 pieces: Sort by part type only. Use larger 2x2 or 3x2 Gridfinity bins for broad categories — bricks, plates, slopes, tiles, Technic. A single IKEA ALEX drawer with a Gridfinity baseplate can hold your entire collection.
5,000 to 20,000 pieces: Sort by part type first, then subdivide popular types by color. Use 1x1 and 1x2 bins for high-count parts like 1x2 plates and 2x4 bricks. Dedicate one drawer per major category.
Over 20,000 pieces: Full element sorting — each bin holds one specific part in one color. This is where Gridfinity shines, because you can fit dozens of small 1x1 bins in a single drawer, each precisely sized.

The key advantage over tackle boxes or plastic drawer units: Gridfinity bins come in any size you need. A 1x1 bin is perfect for rare Technic pins. A 4x2 bin holds bulk bricks. You are not stuck with whatever compartment sizes the manufacturer decided on.

Choosing the Right Bin Sizes for Lego Parts

Here are recommended Gridfinity bin sizes for common Lego part categories:

1x1 bins (42mm square): Rare parts, small Technic connectors, jewelry-sized elements, minifigure accessories
1x2 bins: Standard plates (1x2, 1x4, 1x6), tiles, small slopes
2x2 bins: Standard bricks (2x4, 2x6), larger slopes, windows, doors
2x3 or 3x3 bins: Bulk storage for your highest-count parts, large plates, baseplates, wheels

Bin height matters too. Gridfinity bins come in different unit heights (typically 1U through 6U). For Lego, 3U bins work well for most parts — tall enough to hold a decent quantity, short enough that you can see and grab individual pieces without digging.

Gridfinity vs Traditional Lego Storage Solutions

How does Gridfinity compare to the most popular Lego storage options?

Tackle boxes and Plano containers are the classic choice. They are cheap and portable, but compartment sizes are fixed. You end up with tiny parts rattling in oversized slots and large parts crammed into compartments that are too small. Worse, opening the lid sends parts flying if the box is bumped. Gridfinity bins sit open in a drawer — no lids to fight with.

Akro-Mils cabinets and small-parts drawers work well for medium collections, but each drawer is one big compartment. You need to add dividers manually, and they are never quite the right size. Gridfinity bins replace the drawer entirely with a precisely gridded layout.

LEGO-branded storage tends to be expensive for what you get and is optimized for display, not serious building. The compartments are too few and too large for real element sorting.

Gridfinity wins on flexibility, cost per bin (pennies of filament versus dollars per container), and the ability to customize every dimension. The tradeoff is that you need a 3D printer — but if you are reading this, you probably have one already.

Generate Custom Lego Sorting Trays From a Photo

Here is where it gets interesting. Instead of manually designing bins in CAD or downloading generic sizes from Printables, you can use GridPilot to generate a complete tray layout from a single photo.

Snap a picture of the Lego parts you want to organize — spread them out on a table or photograph them in their current messy state. GridPilot's AI identifies the individual objects, measures their relative sizes, and generates a Gridfinity tray with pockets sized to fit each piece. You get a print-ready 3MF file in under a minute, no CAD skills required.

This is especially powerful for Technic collections, where parts come in dozens of odd shapes that do not fit standard bins. A photo of your Technic axles, gears, and connectors produces bins with slots shaped for each piece — every axle length gets its own compartment.

The same workflow works for minifigure collections, where you might want individual compartments for figures and their accessories, or for specialized parts like train wheels, Bionicle pieces, or Duplo.

Try it with your Lego collection →

Tips for Printing Gridfinity Lego Bins

A few practical tips to get the best results:

Print in a light color. White, light gray, or pastel filament makes it much easier to spot parts at a glance. Black bins look sleek but hide dark-colored pieces.
Use 0.2mm layer height. Gridfinity bins do not need fine detail. Print fast at 0.2mm layers and you can churn out a full drawer of bins in a single overnight session.
Skip the scoop and label features for small bins. For 1x1 bins holding tiny parts, the full scoop profile wastes space. Use simple straight-walled bins to maximize capacity.
Print baseplates in one piece if your bed is large enough. A single baseplate per drawer is sturdier than tiling multiple small ones. Most Gridfinity baseplates print flat without supports.
Label your bins. Use a label maker or print bins with built-in label slots. When you have 50+ bins in a drawer, labels save enormous time.

Start Sorting Smarter

Gridfinity turns Lego storage from a frustrating compromise into a system that actually works the way builders think. Start with one drawer, sort your most-used parts, and expand from there. Every bin you print is one less minute spent digging through a parts bin when inspiration strikes.

If you want to skip the manual design process entirely, try GridPilot — photograph your parts, get a print-ready tray, and start building instead of searching.

Gridfinity for Lego Sorting: Custom 3D-Printed Bins to Organize Your Brick Collection