Free CNC and laser box maker
Four numbers. Width, height, depth, and the thickness you measured. This one is a finger-joint box, and it updates while you type. No CAD, and no account until you export.
A box maker gives you a cube
The next size, the shelf, and the joint you actually wanted are the part that usually means redrawing.
| What traditional box makers give you | What you actually want |
|---|---|
| Plain 6-sided squares | Internal dividers and custom shelving |
| Fingers that stick through the edge | Hidden finger joints and custom pockets |
| Flat 2D layout guessing games | Real-time 3D assembly and material preview |
| Flat edges only | Curves, chamfers, and edge profiles (PartLab) |
Box maker questions
Kerf is the strip the beam removes. A slot cut on the line comes out wide, and the finger comes out narrow. GCrafter keeps kerf on the machine, with a separate value for X and for Y, because a laser often burns differently in the two directions. The fingers are generated from those numbers. Measure a test square, type what the calipers say, and export again.
A router bit is round. The inside corner of a slot is round, and a square finger stops on that radius and sits proud. On a CNC project, GCrafter cuts corner relief, a dogbone, so the finger seats. A laser project uses the beam instead, and it does not inherit the router dogbone.
LightBurn takes .lbrn2. MillMage takes .mage. Carbide Create takes .c2d. SVG and DXF are there when the same box has to move between programs. SVG is the usual laser file. DXF is the safer handoff to a router CAM package, because it carries real units.