Today we're ecstatic to publish our first demo showing a homemade BusKill Cable (in the prototype 3D-printed case) triggering a lockscreen.

| [!3D-Printed USB Dead Man Switch (Prototype Demo)](https://www.buskill.in/3d-print-2024-05/) | |:--:| | Watch the 3D-Printed USB Dead Man Switch (Prototype Demo) for more info youtube.com/v/vFTQatw94VU |

via @[email protected]

In our last update, I showed a video demo where I successfully triggered a lockscreen using a BusKill prototype without the 3D-printed body for the case and N35 disc magnets. I realized that the N35 disc magnets were not strong enough. In this update, I show a demo with the prototype built inside a 3D-printed case and with (stronger) N42 and N52 cube magnets.

What is BusKill?

BusKill is a laptop kill-cord. It's a USB cable with a magnetic breakaway that you attach to your body and connect to your computer.

| [!What is BusKill? (Explainer Video)](https://www.buskill.in/#demo) | |:--:| | Watch the BusKill Explainer Video for more info youtube.com/v/qPwyoD_cQR4 |

If the connection between you to your computer is severed, then your device will lock, shutdown, or shred its encryption keys -- thus keeping your encrypted data safe from thieves that steal your device.

Why?

While we do what we can to allow at-risk folks to purchase BusKill cables anonymously, there is always the risk of interdiction.

We don't consider hologram stickers or tamper-evident tape/crisps/glitter to be sufficient solutions to supply-chain security. Rather, the solution to these attacks is to build open-source, easily inspectable hardware whose integrity can be validated without damaging the device and without sophisticated technology.

Actually, the best way to confirm the integrity of your hardware is to build it yourself. Fortunately, BusKill doesn't have any circuit boards, microcontrollers, or silicon; it's trivial to print your own BusKill cable -- which is essentially a USB extension cable with a magnetic breakaway in the middle

Mitigating interdiction via 3D printing is one of many reasons that Melanie Allen has been diligently working on prototyping a 3D-printable BusKill cable this year. In this article, we hope to showcase her progress and provide you with some OpenSCAD and .stl files you can use to build your own version of the prototype, if you want to help us test and improve the design.

Print BusKill

[!Photo of the 3D-Printed BusKill Prototype](https://www.buskill.in/3d-print-2024-05/)

If you'd like to reproduce our experiment and print your own BusKill cable prototype, you can download the stl files and read our instructions here:

• buskill.in/3d-print-2024-05

Iterate with us!

If you have access to a 3D Printer, you have basic EE experience, or you'd like to help us test our 3D printable BusKill prototype, please let us know. The whole is greater than the sum of its parts, and we're eager to finish-off this 3D printable BusKill prototype to help make this security-critical tool accessible to more people world-wide!

cross-posted from: https://lemm.ee/post/27620066

> Stl is https://www.printables.com/model/498730-raspberry-pi-3-model-b-case-with-raspberry-pi-logo/

cross-posted from: https://lemm.ee/post/27376719

> I redesigned a dog poop bag holder and printed it out. The original model was good, but I don't like flat over hangs. https://www.printables.com/model/812982-dog-poop-bag-roll-dispenser #3Dprinting > >

We're happy to announce that we were successfully able to initiate a BusKill lockscreen trigger using a 3D-printed BusKill prototype!

| [!3D Printable BusKill (Proof-of-Concept Demo)](https://www.buskill.in/3d-print-2023-08/) | |:--:| | Watch the 3D Printable BusKill Proof-of-Concept Demo for more info youtube.com/v/Q-QjHelRvvk |

Via @[email protected]

What is BusKill?

BusKill is a laptop kill-cord. It's a USB cable with a magnetic breakaway that you attach to your body and connect to your computer.

| [!What is BusKill? (Explainer Video)](https://www.buskill.in/#demo) | |:--:| | Watch the BusKill Explainer Video for more info youtube.com/v/qPwyoD_cQR4 |

If the connection between you to your computer is severed, then your device will lock, shutdown, or shred its encryption keys -- thus keeping your encrypted data safe from thieves that steal your device.

Why?

While we do what we can to allow at-risk folks to purchase BusKill cables anonymously, there is always the risk of interdiction.

We don't consider hologram stickers or tamper-evident tape/crisps/glitter to be sufficient solutions to supply-chain security. Rather, the solution to these attacks is to build open-source, disassembleable, and easily inspectable hardware whose integrity can be validated without damaging the device and without sophisticated technology.

Actually, the best way to confirm the integrity of your hardware is to build it yourself. Fortunately, printing your own circuit boards, microcontroller, or silicon has a steeper learning curve than a BusKill cable -- which is essentially just a USB extension cable with a magnetic breakaway in the middle.

Mitigating interdiction via 3D printing is one of many reasons that Melanie Allen has been diligently working on prototyping a 3D-printable BusKill cable this year. In our latest update, we hope to showcase her progress and provide you some OpenSCAD and .stl files so you can experiment with building your own and help test and improve our designs.

Print BusKill

[!Photo of the 3D-Printed BusKill Prototype](https://www.buskill.in/3d-print-2023-08)

If you'd like to reproduce our experiment and print your own BusKill cable prototype, you can download the stl files and read our instructions here:

• buskill.in/3d-print-2023-08/

Iterate with us!

If you have access to a 3D Printer, you have basic EE experience, or you'd like to help us test our 3D printable BusKill prototype, please let us know. The whole is greater than the sum of its parts, and we're eager to finish-off this 3D printable BusKill prototype to help make this security-critical tool accessible to more people world-wide!