Free Laser Cut Box Generator

Box Dimensions

The box generator takes three core dimensions: width, height, and depth. You enter these as the internal or external measurements of the finished box, and the tool calculates the panel sizes accounting for material thickness. Whether you need a small storage box or a large organizer, the parametric design adapts to any size you enter.

All dimensions can be entered in millimeters or inches, matching the units you use in the rest of Cut List Maker. The generator handles the conversion so your cutting files stay accurate regardless of your preferred measurement system.

When you change a dimension, the 3D preview updates in real time so you can see exactly how the assembled box will look before you cut anything.

Material Thickness

Material thickness is the single most important setting for a laser-cut box. It determines the size of every finger joint tab and slot, the depth of the kerf offset, and the final external dimensions of the assembled box. Common laser-cut materials include 3mm acrylic, 3mm plywood, 6mm MDF, and 1/8-inch birch ply.

The generator reads your material thickness and adjusts the finger joint pattern so tabs and slots match exactly. A material that is even slightly thicker or thinner than the setting can cause a loose or tight fit, so measure your stock with calipers before entering the value.

Because laser-cut parts rely on press-fit assembly, getting the material thickness right is what makes a box that snaps together without glue versus one that falls apart or will not fit.

Finger Joints

Finger joints, also called box joints or tab-and-slot joints, are the standard way to assemble laser-cut boxes. Each edge of a panel has a repeating pattern of tabs and slots that interlock with the mating panel. The result is a strong corner connection that holds itself together during assembly and provides a large glue surface for a permanent bond.

The box generator calculates the finger joint pattern automatically. The number of tabs depends on the edge length and material thickness: shorter edges get fewer tabs, longer edges get more, and the generator distributes them evenly so corners line up cleanly.

Each corner is generated with a consistent tab direction, so when you assemble the box the pattern is symmetric and the joints are hidden on the inside of the corner for a clean appearance on the outside.

Press-Fit Bumps

Press-fit bumps are small additions to the sides of finger joint tabs that create friction when the tab is inserted into its slot. The slight bulge compresses during assembly and holds the parts together without glue, which is useful for prototype boxes, adjustable designs, or when you want to disassemble the box later.

The box generator can add press-fit bumps to the finger joint tabs. The bump size is derived from your kerf setting, so the interference fit is consistent across different materials and laser setups. A larger kerf value produces larger bumps for a tighter hold.

For permanent boxes, you can disable press-fit bumps and rely on the finger joints alone with wood glue applied during assembly. The choice depends on whether you want a removable or a fixed box.

Kerf Compensation

Kerf is the width of material removed by the laser beam as it cuts. A typical laser kerf ranges from 0.1mm to 0.3mm depending on the laser power, lens, speed, and material. Because the laser removes material on both sides of the cut line, the finished part is slightly smaller than the drawn outline.

The box generator includes a kerf setting that offsets the cutting paths inward by half the kerf width. This compensates for the material loss so the finished tabs and slots match their intended dimensions. Without kerf compensation, finger joints tend to be loose because both the tab and the slot are oversized.

To find your kerf value, cut a small square and measure the width of the cut slot with calipers. Enter that value as the kerf setting, and the generator applies the offset to every cut path in the layout automatically.

Lids

The box generator supports optional lids that fit on top of the assembled box. You can choose a press-fit lid that slots into finger joints on the top edge of the side panels, or a removable lid that rests on an internal lip. Both styles are generated with matching finger joint patterns so the lid sits flush and stays in place.

A press-fit lid uses the same finger joint pattern as the bottom panel, creating a symmetric box that can be opened from either side. A lip lid sits on a narrow ledge cut into the inside of the side panels, which keeps the top surface flat and unbroken.

When a lid is enabled, the generator adds it to the cutting layout and includes it in the stock sheet plan, so you get a complete parts list for the entire box in one export.

Dividers

Dividers create internal compartments inside a box. The box generator can add dividers that run in either or both directions, splitting the interior into a grid of cells. Each divider is a flat panel with finger joint tabs on its top and bottom edges that slot into matching grooves cut into the side panels.

When two dividers cross in the middle of the box, the generator cuts a half-depth slot in each one so they interlock at the intersection without gaps. This creates a rigid internal grid that stays in place without glue.

Divider positions are specified as distances from one wall, and the generator calculates the divider length based on the box interior dimensions minus the material thickness on each side. The 3D preview shows the dividers in place so you can verify the compartment layout before cutting.

Stock Sheet Planning

Every part of your box, including the sides, lid, and dividers, needs to fit on your laser cutter bed. The box generator includes a stock sheet planner that arranges all the flat panels onto your specified sheet size and shows how many sheets you need.

You enter the dimensions of your laser bed or your stock material, and the planner arranges the panels to minimize waste. Parts are rotated and nested to fit the most pieces on each sheet, and the planner shows the remaining usable area so you can decide whether to squeeze in another part or save the offcut.

This is especially useful when a box has many dividers or large panels, since the total number of parts can exceed a single sheet. The planner tells you how much material to prepare and how to arrange the cuts.

SVG and DXF Exports

The box generator exports cutting files in two formats: SVG and DXF. SVG (Scalable Vector Graphics) is a vector format supported by many laser-cutting tools. DXF (Drawing Exchange Format) is commonly used by CAD and laser-cutting workflows.

Both export formats contain the generated cutting layout with panels, finger joints, optional lid parts, dividers, and kerf compensation applied. Review the file in your cutting software before sending it to your machine.

The exported files use real-world units matching your project settings, so a dimension entered in millimeters produces an SVG or DXF file measured in millimeters. This means the file imports into your laser software at the correct scale without manual rescaling.

3D Preview

Before you cut anything, the box generator shows a live 3D preview of the assembled box. The preview is rendered in your browser using Three.js, so it updates instantly when you change any dimension, toggle the lid, add dividers, or adjust the material thickness.

You can rotate the box, zoom in to inspect finger joint details, and confirm that the dividers and lid look right. The 3D preview shows the box as it will appear after assembly, with all panels joined at the corners.

The preview is a visual check only. The cutting files are generated separately from the same parameters, so what you see in 3D matches what the laser will cut.

Frequently Asked Questions

What box types are supported?

The generator supports open boxes, closed finger-joint boxes, removable lids, sliding lids, and single or double doors. Add internal dividers when you need compartments.

How should I measure the material?

Measure the actual material with calipers and enter its thickness, then choose millimeters or inches and enter internal or external box dimensions.

How do I set the kerf?

Cut a small test piece, measure the material removed by the laser, and enter that measured kerf value in the Joint Fit settings.

What do the exports include?

SVG and DXF exports include the generated panels, joints, optional lid or door parts, dividers, and the applied kerf compensation in the selected units.