Free Custom Bin, Sorting Tray & Baseplate Generator for 3D Printing

Create perfectly sized storage bins, sorting trays, drawer organizers, parts bins — and Gridfinity-compatible grid bins and baseplates — all customized to your exact needs. This parametric bin generator runs entirely in your browser using CSG (Constructive Solid Geometry) powered by the Manifold engine. Adjust dimensions, wall and divider thickness and corner radius; split the bin into an even grid, or place walls, label ledges and finger scoops anywhere for irregular layouts. Add a self-centering stacking lip, a label shelf or tab, magnet holes, or filament-saving floor holes. Check the fit against your printer's build plate and download a print-ready STL file instantly — no sign-up, nothing to install, and your design never leaves your computer.

Popular Use Cases

Irregular layouts, not just rows and columns

Columns and rows give you an even grid in one move. For anything else, open Layout and press Add: a Wall at any millimeter position — for instance one long compartment across the back for pencils with three short ones in front — with a from and to so it can span only part of the bin; a Label ledge to put a shelf on one compartment only; a Scoop on the left wall of a deep bin. Click any placed feature in the 3D preview to select it, then drag its sliders, duplicate it or delete it. The compartment count and material volume update live, and every layout is exported as a single watertight STL.

Gridfinity-compatible grid bins and baseplates

Gridfinity is an open, modular storage standard created by Zack Freedman for 3D-printed workshop organization. Everything sits on a 42 × 42 mm grid: baseplates have a pocket for every grid cell, and bins have a matching chamfered foot under every cell so they drop in, locate precisely, and lift out again. Heights come in 7 mm units, so a 3U bin is 21 mm tall to the base of its lip and a 6U bin is 42 mm. Because the dimensions are published, bins from any designer or generator are interchangeable — including the ones you make here. The Grid Bin and Baseplate modes of this tool follow those published dimensions.

Baseplates

Switch to Baseplate to generate a Gridfinity-compatible baseplate for any number of columns and rows. Choose a thin frame with open pockets for the least filament, or a solid plate with a flat bottom, Ø6.5 mm magnet pockets that line up with bin magnets, and countersunk mounting holes for screwing the plate into a drawer — in every cell or just the corners. Type the inside width and depth of a drawer, press Fit, and the tool picks the largest grid that fits; tick Pad the plate to extend the edges so the baseplate fills the drawer exactly with the grid centered.

How to size a baseplate for a drawer

1. Measure the inside width and depth of the drawer in millimeters.
2. Divide each by 42 and round down — that is the number of columns and rows. A 250 × 200 mm drawer takes a 5 × 4 grid (210 × 168 mm).
3. Enter the measurements in Fit to a drawer and press Fit; the leftover space is shown underneath.
4. Enable Pad the plate to fill the leftover space, or leave it off and print the plate at exactly 42 mm per cell.
5. If the plate is bigger than your print bed, pick your printer under Check Printer Fit and print two or more smaller plates that tile edge to edge — the grid pitch stays continuous.

Dimensions used by the grid modes

How It Works

1. Pick what to make: a custom bin, a grid bin, or a baseplate
2. Adjust dimensions using the sliders or type exact values (mm or inches); grid bins use 42 mm units or a custom footprint
3. Set the quick grid (columns × rows), then place walls, label ledges or scoops anywhere you need them
4. Customize outer wall, floor and inner wall thickness plus corner radius
5. Optional: stacking lip, label shelf or tab, front scoop, floor holes, magnet and screw holes
6. Select your printer to confirm the model fits your build plate
7. Click Download STL to get a watertight, print-ready file

Recommended Print Settings

• Layer height: 0.2 mm (0.16 mm if you want the chamfers extra smooth)
• Infill: 10–20 % (bins are mostly walls and need little infill)
• Walls: 2–3 perimeters for durability
• Material: PLA for general use, PETG for heavy tools or a hot garage
• Supports: not needed — feet, lip, ledges and scoops are all 45° or shallower; the thin lip has a 1.4 mm bridge that prints without help
• Print feet-down directly on the bed; press magnets in after printing (a drop of CA glue helps)

Frequently Asked Questions

What is a parametric bin generator?

A parametric bin generator lets you create custom 3D-printable storage bins by adjusting parameters like width, depth, height, number of compartments and wall thickness. Unlike fixed STL files, every dimension is adjustable to your exact needs.

Can compartments be different sizes?

Yes. Leave the quick grid at 1 × 1 (or any grid) and place walls at the positions you want; each wall can run the full length of the bin or only part of it, so one long compartment can sit beside several short ones.

Are the grid bins compatible with other Gridfinity bins and baseplates?

Yes. The Grid Bin and Baseplate modes use the published Gridfinity dimensions — 42 mm grid, 7 mm height units, the 0.8 / 1.8 / 2.15 mm base profile and the 0.7 / 1.8 / 1.9 mm lip — so bins fit baseplates from any source and stack with other Gridfinity-compatible bins. Keep the grid pitch at 42 mm for compatibility.

Can I make a grid bin that isn't a whole number of grid units?

Yes. Turn on Custom footprint in Grid Bin mode and type the outer width and depth in millimeters. The bin keeps standard feet under every cell it overlaps, trimmed to the footprint, so it still seats in a baseplate. For a bin with no grid feet at all, use Custom Bin mode.

Which magnets do the grid bins use?

6 mm diameter × 2 mm thick neodymium disc magnets. The generator makes Ø6.5 × 2.4 mm pockets so they press in with a snug fit; bin magnets line up with the magnet pockets in a solid baseplate from this tool.

How tall is a 3U or 6U grid bin?

Heights are 7 mm per unit measured from the bottom of the base to the base of the stacking lip: 3U is 21 mm and 6U is 42 mm. With the lip enabled, add 4 mm. The inside floor sits at 7 mm by default, which you can lower for extra depth.

Can I make bins that stack?

Yes. For custom bins, enable "Stacking Lip" to add a 45° chamfered rim to the top and a matching chamfer to the bottom edge, so identical bins self-center when stacked. Grid bins use the standard Gridfinity-compatible stacking lip.

What are finger scoops?

Finger scoops add a curved ramp along a wall so small parts such as screws, nuts and SMD components slide up the curve and are easy to pick out. The curve is concave, so it prints without supports.

Do I need supports?

No. The base chamfers, lip, lip support, ledge wedges and finger scoops are all designed to print without supports. Magnet pockets are short bridges that FDM printers handle without help.

Do I need to install any software?

No. This tool runs entirely in your web browser using WebAssembly. There's nothing to download or install, and the 3D model is generated on your device — your data never leaves your computer.

What file format is the output?

A watertight binary STL, Z-up and already sitting on the build plate, which opens in Bambu Studio, OrcaSlicer, PrusaSlicer and Cura. Downloading requires a PrintPal Pro or Studio subscription; designing and previewing is free.

Gridfinity is an open storage standard created by Zack Freedman. PrintPal is not affiliated with or endorsed by Gridfinity or its creator; "Gridfinity-compatible" describes the published dimensions the grid modes follow so that parts interoperate.