Spring Loaded CNC Pen Holder

Introduction: Spring Loaded CNC Pen Holder

About: Hey! I'm Henri and I love making things

Hello! This instructables will show how to make an inexpensive yet very effective pen holder which will help maintain even pressure across the printing/machining surface of a CNC machine. I was inspired by this instructable by ähöüokul :


However, I couldn't find the required bits at the time. And so, instead, I searched for an alternative. What I have come up with is an unintentionally steampunk looking, pen holder made from widely available plumbing supplies.

Step 1: Tools & Materials

You'll require only a few fairly basic tools:

  • Pipe cutter link or you could use a hacksaw
  • Glue gun

And the materials:

  • 15mm Ø copper pipe
  • 1/2" Brass hex nipple link x 4
  • 1/2" Flanged brass end cap link x 1
  • 1/2" Brass socket link x 4
  • Duct tape
  • Two part epoxy
  • Fine liner pen of your choosing
  • Spring from a disposable biro

These bits should cost you around £10 and are available from most hardware stores.

Step 2: Assemble

I have made a short video going through the steps I took to build this holder. If you have any questions please leave me a comment and I'll do my best to answer them.

Happy making!

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    Tip 3 years ago

    What a simple idea. I built this and it works perfectly. One thing to watch though - not all 1/2" Brass hex nipples are the same. Even from the same supplier I found that some had a slightly smaller I/D and the 15mm pipe was too tight a fit. However by visiting a few plumbing merchants with a piece of 15mm pipe in my hand I was able to find 4 that were the right size.

    I also 3D printed a set of collars of different sizes to hold my pen securely in the pipe