Universal CNC Pen Plotter - 1/2" Shank Adapter

Turn Your CNC Router into a Precision Pen Plotter

This spring-loaded pen adapter allows you to draw, plot, and write with your CNC machine. While originally designed for the Laguna Swift 4x4, it features a standard 1/2" shank, making it compatible with any CNC router capable of accepting 1/2" tooling and having sufficient Z-height clearance.

Key Features:

• Spring-Loaded Pressure: The built-in spring mechanism (using a 10x20mm spring) allows the pen to "float" over uneven surfaces, ensuring consistent line width without damaging the pen tip or your material.
• Standard 1/2" Shank: Fits standard 1/2-inch collets found on most industrial and prosumer CNC spindles.
• Quick-Change Carriers: Includes knurled caps for tool-free swapping between different pen colors or types.

Compatibility Guide:

• Spindle: Requires a 1/2" Collet.
• Clearance: Designed for machines with high gantry clearance (approx. 7.5 inches or similar). Please check your Z-travel before printing!
• Supported Pens:
  • Fine & Ultra Fine Sharpies
  • Standard Pencils
  • Bic-style Pens (7mm to 12.25mm diameter)

Required Hardware:

• Spring: 10x20mm compression spring (Link to Home Depot).
• Alternative: You can use a foam earplug for a "soft" spring effect in a pinch.

How to Use:

1. Assembly: Clip the spring into the cap (nubs hold it in place).
2. Load Pen: Insert your pen into the carrier. It’s a friction fit—push hard!
3. Insert: Drop the carrier into the main holder. It should slide freely.
4. Secure: Screw on the cap.
5. Run: Chuck the 1/2" shank into your spindle. IMPORTANT: Ensure your Spindle RPM is set to ZERO (OFF).

There are plenty of YouTube videos on using your CNC as a pen plotter. Most are centered around using V-Carve (which is probably the best way to get images and text to your CNC). Fusion 360 works too, but doesn't have all the options V-Carve does.