CNC PENCIL — watch a pen plotter draw, stroke by stroke

Drop an SVG and watch a virtual pen plotter draw it, stroke by stroke, motor sounds included. CNC PENCIL is a simulator of the most hypnotic machine in the maker world — the robotic arm that draws with a real pen — without the hardware bill.

Frequently asked questions

What is a pen plotter?

A machine that moves a real pen over paper along programmed paths — the ancestor of the printer, reborn as an art tool. Watching one draw is famously mesmerising, which is exactly what this simulates.

What does the simulator do?

It takes a vector image (SVG) and draws it the way a physical plotter would: line by line, with the pen travelling, lifting and landing — motor sounds included.

Can I use my own drawings?

Yes — drop in an SVG file and watch it drawn. Any vector graphic becomes a little performance.

Where do I get SVG files?

Any vector editor exports them — Inkscape and Illustrator among others — and the web is full of free SVG art. Line art works best; plotters think in strokes, not pixels.

Why is watching a plotter so satisfying?

It is slow, precise and irreversible — the picture assembles in real time and your brain narrates every stroke. It is ASMR for the eyes.

Is it free?

Yes, it runs free in the browser at plotter.bnj.app.

Do I need to install anything?

No — open the page, drop a file, watch.

Does it sound like a real machine?

Yes, the stepper-motor whirr is part of the show. Headphones recommended.

Is this useful or just relaxing?

Both: it is a lovely idle watch, and if you own or want a real plotter it is a way to preview how a design will draw before committing pen to paper.

Does it work on a phone?

Yes, it runs in the mobile browser too — a tiny drawing machine in your pocket.

More from BNJ: KARALAMA · VICIK · BETONBOX · KIPIRTI — see them all at bnj.app.