How to design custom cookie cutters in Tinkercad.

Before you start: the numbers that matter

A good cookie cutter is not just a shape. It is a shape with specific dimensions that make it work on real dough. Before opening Tinkercad, know these numbers:

• Cutting edge thickness: 0.4mm to 0.8mm. Thinner cuts cleaner but is fragile. We use 0.4mm (single nozzle width) for simple shapes and 0.8mm for complex shapes with thin peninsulas.
• Cutting edge height: 10-15mm. This is how deep the cutter presses into the dough. Standard rolled cookie dough is 5-8mm thick, so 10-15mm gives enough clearance to cut through without the handle contacting the dough.
• Handle/grip wall thickness: 3-5mm. This is the wider section at the top of the cutter that you press with your fingers. It needs to be thick enough to be comfortable and rigid.
• Handle height: 5-10mm. Combined with the cutting edge height, the total cutter height is typically 15-25mm.
• Overall cutter size: 50-100mm across for most designs. Smaller than 40mm and detail is lost. Larger than 120mm and the cutter becomes difficult to print flat and requires more force to cut through dough.

Step 1: Create your base shape

Open Tinkercad and create a new design. The workspace shows a grid-marked plane.

For a simple geometric cutter (circle, star, heart), you can build directly from Tinkercad's built-in shapes. Drag a shape onto the workspace and resize it to your desired cookie dimensions.

For a custom shape (a logo, a pet silhouette, a custom lettering), the approach is different. You will need an SVG file of the outline. You can create this in any vector drawing program (Inkscape is free) or find SVG files online. In Tinkercad, click "Import" in the top right, select your SVG file, and it will appear as a solid 3D shape on the workspace. Set the height to your desired cutting-edge height (10-15mm).

Step 2: Turn the solid shape into a cutter outline

A cookie cutter is not a solid shape. It is the outline of a shape, thin enough to cut dough. Here is how to create that outline in Tinkercad:

1. Place your solid shape on the workspace. Set its height to 15mm (this will be the cutting edge + handle).
2. Duplicate the shape (Ctrl+D). Scale the duplicate down by 1-2mm on each side. This creates a slightly smaller version of the same shape.
3. Change the duplicate to a "hole" (the hollow cylinder icon in the inspector). A hole in Tinkercad subtracts from solid objects when they are grouped.
4. Center the hole shape inside the original solid shape. Both should be at the same height.
5. Select both shapes and click "Group" (Ctrl+G). Tinkercad subtracts the hole from the solid, leaving you with just the outline wall. This wall is your cutting edge.

The wall thickness from this method equals half the size difference between the original and the scaled-down duplicate. If you scaled down by 1mm on each side, the wall is 1mm thick. For a 0.8mm cutting edge, scale down by 0.8mm on each side.

Step 3: Add the handle/grip

The cutting edge alone is too thin to press comfortably. You need a wider section at the top that your fingers can grip. There are several approaches:

Method A: Tapered wall. Duplicate your outline shape, scale it up by 3-4mm on each side, and set the height to 8mm. Position it on top of the cutting edge so the two parts share a common wall at the junction. Group everything together. This creates a cutter that is thin at the bottom (the cutting edge) and thicker at the top (the grip).

Method B: Flat rim. Create a second copy of the outline at the full handle thickness (4-5mm wall) and a height of 5-8mm. Place it on top of the cutting edge section. This creates a stepped profile: thin blade at the bottom, flat wide rim at the top. This is the approach most commercial cookie cutters use.

Method C: Internal bracing. For large or complex cutters, add a cross-brace inside the cutter. This is a thin wall that spans across the interior, connecting opposite sides. It prevents the cutter from flexing when pressed into dough. In Tinkercad, create a thin box shape and position it across the interior of the cutter at the handle height.

Step 4: Check your dimensions

Before exporting, verify these measurements in Tinkercad's dimension display:

• Total height: 15-25mm
• Cutting edge wall thickness: 0.4-0.8mm
• Handle wall thickness: 3-5mm
• No thin peninsulas less than 3mm wide (they break during printing or dough-pressing)
• No sharp internal corners less than 1mm radius (dough sticks in sharp corners and the print may fail there)

If your design has very thin points or deep narrow channels, consider simplifying those areas. A cookie loses detail when baked anyway, so features smaller than about 3mm will not be visible on the final cookie.

Step 5: Export as STL

Click "Export" in the top right of Tinkercad. Choose STL format. The file downloads to your computer and is ready for your slicer software (Bambu Studio, PrusaSlicer, Cura, or OrcaSlicer).

In your slicer, orient the cutter with the cutting edge down (on the build plate) and the handle/grip facing up. This orientation gives the cleanest cutting edge because the first layers printed on the build plate are the smoothest.

Step 6: Test print and bake test

Print the cutter with these settings:

• Layer height: 0.2mm
• 3-4 wall lines
• 0% infill (for the cutting edge section; the walls are the structure)
• No supports needed if the cutter is oriented correctly

Once printed, do a real dough test. Roll out your standard cookie dough to 6-8mm thickness. Press the cutter through the dough with even pressure. Check:

• Does it cut cleanly through the full depth?
• Does the dough release from the cutter without sticking?
• Does the cutter flex or bend during pressing?
• Are any thin sections too fragile?

If the dough sticks, lightly flour the cutter or chill it in the freezer for 5 minutes before cutting. If the cutter flexes, add internal bracing or increase the wall thickness. If a thin section breaks, thicken it in the model or simplify the outline in that area.

Common mistakes and how to fix them

• Cutting edge too thick (>1mm): The cutter does not cut cleanly and pushes dough sideways rather than slicing through. Reduce the wall thickness to 0.4-0.8mm.
• Design too detailed: Tiny features (letters under 10mm, thin tendrils, sharp points under 2mm) either fail during printing or break during use. Simplify the design and increase the minimum feature size.
• No draft angle on the walls: Cookie cutter walls should be perfectly vertical (no draft). If the walls are tapered inward, the dough will stick when you lift the cutter. In Tinkercad, shapes default to vertical walls, so this is usually not an issue.
• Forgetting to group all parts: If you have multiple shapes that make up the cutter (outline + handle + bracing), make sure everything is grouped into a single object before exporting. Ungrouped parts may shift position when imported into a slicer.

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