How to 3D Model a Safe Knife Slice Guard in SelfCAD

 |  Moses Zikei

How to Use SelfCAD to Easily Create a Safe Knife Slice Guard 

A knife slice guard is a simple but practical accessory designed to help protect your fingers while slicing fruits, vegetables, or other ingredients. In this tutorial, we’ll walk through creating a safe knife-slice guard using SelfCAD. The process is beginner-friendly and focuses on turning simple shapes into a useful kitchen tool that can be customized to fit your needs.

By the end of the guide, you’ll have a 3D printable knife slice guard ready for use, along with a better understanding of how SelfCAD can be used to create practical everyday items.

Steps of Creating a Knife Slice Guard

You can check out the interactive tutorial to learn how 3D design it. In summary, start by launching SelfCAD, and open the workspace:

SelfCAD workspace

Select a Cylinder from the 3D Shapes:

3D shapes category

Set the parameters of the cylinder as follows:

Setting parameters

Select the Cube Selection and set Right to 65:

Cube selection

Tick the check mark to finalize the selection. Click Delete to delete the selected part:

Delete option

Activate Polygon Selection, then select the highlighted part. Then Delete them:

Polygon selection

Scale the object by scaling Z to 125:

Scaling the model


Select another Cylinder and set the parameters as follow and tick the checkmark to finalize the object:

Cylinder settings

Delete the top and bottom polygons of the cylinder:

Deleting the top and bottom sections

On the Modify category, select the Add Thickness tool and set the Thickness to 4:

Add Thickness

In the Utilities category, select the Mirror tool and Create a Copy. Set the Offset to 0.9:

Creating a copy

Tick the check mark to finalize the operation. Select Mesh_4 and use the Add Thickness tool to set thickness to 6:

Adding thickness to the model

Select all the objects on the workspace. On the Boolean tools, select Union:

Boolean operation

You can give it colour of your choice:

Coloring the model

The knife guard is finally ready. 

Creating a safe knife slice guard in SelfCAD is a great example of how simple 3D designs can improve everyday tasks. With just a few steps, you’ve designed a practical tool that can help make food preparation safer and more comfortable.

Along the way, you’ve also learned useful modeling techniques that can be applied to many other functional projects. As you continue exploring SelfCAD, you can experiment with different sizes, shapes, and features to customize the design even further.


Enjoy powerful modeling, rendering, and 3D printing tools without the steep learning curve.

Need to learn 3D modeling? Get started with interactive tutorials.

Was this blog post interesting or helpful?