The Onkon-4040 Writing and Drawing Machine Pen Plotter by BDTronics is a professional-grade 2D drawing bot designed for precision writing, sketching, plotting, and CAD-based drawing applications. Built on a highly stable CoreXY motion system, this pen plotter delivers smooth, accurate, and repeatable movement across a large drawing area, making it suitable for educational use, art creation, engineering diagrams, school projects, logo sketching, PCB marking, and automation tasks.
With a generous 34x30cm drawing surface, the Onkon-4040 supports a wide variety of writing instruments including pencils, ball pens, gel pens, markers, and permanent markers, thanks to its adjustable and replaceable pen holder system.
The machine is controlled by a reliable Arduino UNO + GRBL control system, offering compatibility with widely used software such as Universal Gcode Sender and Inkscape, enabling users to work with G-code files easily. Lightweight at around 4kg, the Onkon-4040 arrives fully assembled and ready to operate, making it ideal for beginners, students, hobbyists, artists, designers, and professionals looking for a dependable, large-format writing robot.

Features:

• CoreXY motion system for high-precision drawing and writing

• Large 34x30cm effective drawing area for bigger artwork and documents

• Fully assembled machine—no complex setup required

• Adjustable writing angle from 35° to 90° for different pen styles

• Supports pencils, ball pens, markers, gel pens, permanent markers

• Smooth belt-driven movement for stable and consistent output

• Compatible with Universal Gcode Sender and Inkscape for easy workflow

• High-quality Nema17 Twotrees stepper motors for accurate motion

• Replaceable pen holder for various writing tools

• Lightweight (~4kg) and easy to place on any flat surface

• Suitable for drawing, writing, plotting, sketching, signatures, CAD diagrams

How to Use:

• Place the Onkon-4040 on a flat and stable surface

• Connect the power adapter and USB cable to your computer

• Install required software from the included USB flash drive

• Import or create your drawing in Inkscape or CAD software

• Generate G-code and load it into Universal Gcode Sender

• Adjust the pen holder and writing angle based on the tool being used

• Secure your paper or drawing sheet onto the platform

• Start the plot job and monitor the drawing process

• Replace or adjust the pen holder if switching between writing instruments

Product Instructions:

• Ensure the pen tip touches the paper lightly to avoid motor strain

• Do not forcefully press down on the pen holder during installation

• Keep belts properly tensioned for optimal performance

• Clean dust or debris from the linear rails regularly

• Verify stepper driver settings (DRV8825 or TMC2208) before long tasks

• Use smooth, stable pens or markers for best drawing quality

• Save artwork as SVG or DXF format before generating G-code

• Keep cables organized and avoid placing objects near moving axes

Specifications:

• Model: Onkon-4040

• Brand: BDTronics

• X Axis Length: 400mm

• Y Axis Length: 400mm

• Drawing Area: 34x30cm (13.5 x 11.8 inches)

• Power Supply: 12V 3A

• Writing Angle: 35–90° adjustable

• Weight: ~4kg

• Control Board: Arduino UNO with GRBL Shield

• Drive System: Belt Drive

• Stepper Motor: Twotrees Nema17 17HS8401

• Motor Driver: DRV8825 / TMC2208

• Supported Tools: Pencil, ballpoint pen, marker pen, gel pen, etc.

• Supported Software: Universal Gcode Sender, Inkscape

Package Includes:

• 1 × Onkon-4040 Drawing Bot

• 1 × Instruction Manual

• 1 × 4.5A Power Adapter

• 1 × Gel Pen

• 1 × USB Cable

• 1 × USB Flash Disk (Software)

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