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Handheld CNC engraving pen

Darko Savic
Darko Savic Mar 08, 2022
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Handheld CNC engraving pen that is controlled via Bluetooth/phone app. Hold it against any flat surface and it autonomously engraves up to a few words.
Easy engraving of anything on any flat surface.
Usage examples
  • Engrave your adapters with the names of the devices they belong to so that in the future you know which is which.
  • Engrave your phone number on your keys in case they are lost.
  • Engrave your partner's phone number on the back of your phone for the same reason.
  • Leave love messages on wooden surfaces.
  • etc
How it works
A battery-powered, handheld CNC engraver that can engrave up to a few words within its designated working area. The working area is limited by a maximum number of characters that fit within it.
CNC stands for computer numerical control. Cutting motion is controlled by software rather than by hand. The only reason this is called a "pen" is because of its size and the way it is placed over the engraving area. You hold it still. It does the rest.
The CNC pen connects to a smartphone via Bluetooth and is operated via an app. You see a square text area with a limited number of possible characters. You type in up to a few words and send them to the pen's memory.
The pen only has one button. You place the pen's engraving head over the area where you want the words to appear. Click the button and the CNC head starts moving and cutting to engrave the words.
The engraving tips are exchangeable. Different materials require different tips.
How would you make use of this CNC pen?
Creative contributions

Obvious problems with the stillness of the hand - laser-guided projection of the text

jnikola Mar 14, 2022
I like the idea and I like how you solved the problem of different materials, but how would you solve the problem of hand stillness while engraving?
It's natural that your hand moves a bit while you hold a pen. Even a small movement could result in an engravement mistake and ruin your device/object for good.
Partial solutions
  • a laser-guided projection of the engraving text (problems with movement if the system is integrated into the pen)
  • a plastic scheme that helps you engrave the text precisely (plastic letters)
  • a vacuum-based "fixator" for the pen (like shown in the session photo; would not work good on small objects)
Can you think of any?
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Darko Savic
Darko Savic2 years ago
You press the engraver against the surface. There is no tip to be felt before you press the button. The "cage" part of the pen firmly touches the surface. You keep it pressed like this. When the tip starts engraving it's not strong enough to push your hand away. The pen stays firmly at a 90 degrees angle throughout the process. You release it when the process stops.
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jnikola2 years ago
Darko Savic Okay, that sounds feasible for the phones and other flat and solid surfaces, but how could this work on, for example, your cables, keys, or pens?
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General comments

Oguntola Tobi
Oguntola Tobi2 years ago
I'll use it on every personal item I own that can be engraved upon, especially my gadgets and accessories.
I think it'll add an extra layer of protection to them. Nothing elaborate, though. Just my initials.
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