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Super Awesome Sylvia's WaterColorBot's video poster

The Friendly and Educational Art Robot that Paints with Watercolors! Read more

Sunnyvale, CA Hardware
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This project was successfully funded on August 15, 2013.

The Friendly and Educational Art Robot that Paints with Watercolors!

Sunnyvale, CA Hardware
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About this project

Our Kickstarter campaign has ended, but you can still get a WaterColorBot! Please visit for more information and to place your order.

Starting with vector artwork on your computer-- or following along as you sketch in real time --the WaterColorBot dips its brush in water, goes and gets the right color of paint, and paints before your eyes.

The WaterColorBot works with standard watercolor paints and paper, so that you never need to purchase specialized or expensive supplies. It is made in the USA with a tough and sturdy wooden frame to last for years of use.

While a robotic painting "printer" can be an incredibly fun thing on its own, the WaterColorBot is also a genuine (if simple and friendly) computer-automated, numerically controlled (CNC) machine-- and that lets you do some amazing things.

For an example, take a look at the two paintings shown above-- they are nearly perfect copies. One was painted right one painted right after the other. With the WaterColorBot, you can easily make an extra painting for Grandma. (And you can always save the file for later, just in case something happens to the one on the fridge.)

How the WaterColorBot works

The WaterColorBot is essentially a specialized pen plotter that uses a set of watercolors.

To move the paint brush, there are two motors built into the frame of the robot. Each motor drives a little winch that moves a length of cord attached to a rod that controls either the X or Y position of the brush.

This same mechanism (right down to the winches and cords) can be found inside many vintage plotters and chart recorders. It is also the same mechanism that an Etch-a-Sketch uses, except that instead of a stylus, we have a carriage that moves the brush up and down.

What's in the box?

The WaterColorBot comes as a kit, with some assembly required. The major components (chassis, carriage, and motor controller board) come pre-assembled. It also comes with a starter set of watercolor paints, paper, and a brush. Please see the FAQ below for a more detailed list of the kit contents.

You will need a recent-vintage computer (say, made within the last five years) with an available USB port. You will also need internet access to download software, instructions, and (optional) instructional videos.

To put the kit together, you'll need small and medium philips-head screwdrivers, and a sharp pair of scissors. Pre-teen and younger kids will need adult help to put it together and get started using it.

History of the project

Sylvia Todd, star of Sylvia's Super-Awesome Maker Show, came up with the idea for the WaterColorBot because she wanted to create an art robot and enter it in the RoboGames competition. She approached us at Evil Mad Scientist Laboratories about collaborating on the project, and we loved it.

Together we designed and built our first prototype in February, and had a nicely-working robot about a month later. As we realized that this project had a lot of appeal beyond just a one-off project, we started developing it into a kit. Sylvia exhibited her prototype at RoboGames (and won a Silver medal), and we also brought the WaterColorBot to Maker Faire, where thousands of people got to play with it.

Sylvia was also invited to the White House Science Fair in April, where she got to demonstrate the WaterColorBot for President Obama (pictures and media coverage here).

Manufacturing the WaterColorBot

We will be manufacturing the WaterColorBot right here at our shop in Sunnyvale, California. The main chassis of the WaterColorBot is cut from American hardwood plywood using a CNC router, sanded, and finally laser engraved to provide the markings. The carriage and winches are built out of laser-cut wood. We also laser cut and machine Delrin parts, such as the cable guide. The lower "spoilboard" that holds the water, paints, and paper is machined from MDF.

Because we're manufacturing it in-house, we've been able to prototype our manufacturing processes in parallel with the design, every step of the way. We're also building on two years of experience of manufacturing our Ostrich Eggbot kit, which is also made from a combination of CNC routed and laser cut wood and Delrin parts, along with the same motion-control platform that drives the WaterColorBot.

Why Kickstarter?

We're launching the WaterColorBot on Kickstarter for a few different reasons. The most obvious reason is to finance the initial manufacturing run, but more importantly, we are really excited about the WaterColorBot and we want to help it reach as wide of an audience as possible.

Why we're excited about the watercolorbot

A young visitor plays with the WaterColorBot at Maker Faire
A young visitor plays with the WaterColorBot at Maker Faire

Beyond simple fun, we think that the WaterColorBot has enormous potential for STEM and STEAM education, especially as a way to get young people engaged with hands-on technology and robotics. We are particularly interested finding ways to inspire young women to pursue careers in science and technology. We cannot imagine any better way to do so, than starting with a robot co-designed by a 12 year old girl.

Risks and challenges

The WaterColorBot is manufacturable and at a late stage of development, so we forsee no overall obstacles to completing the project and shipping our first units. However, our production schedule is ambitious, and could be delayed by parts availability, production time, and other factors.

From our experience manufacturing and shipping thousands of kits (such as our Deluxe Egg-Bot kit) over the past few years, we know about inventory delays, and the havoc that they can wreak upon a project. We mitigate this in a few different ways. First, thanks to Kickstarter, we will know exactly how many machines to build. This allows us to order our parts and materials early, and in the actual quantities needed. Second, most of our parts and materials are common types, for which alternate suppliers are available. Finally, the motion control platform on the WaterColorBot (the motor and controller combination) is the same one that we already use in our Egg-Bot kits, for which we have already established reliable supply chains.

There are other things that could potentially delay shipment-- for example a truly unavoidable chip shortage at the manufacturer level. We will be in close contact with our backers should anything of this nature occur, and will do our best to work around any problems as needed.

We have had the experience of backing projects on Kickstarter, with both stellar and less-than-stellar outcomes. We want to ensure that the WaterColorBot ships on-time, and is a delight to use.

Learn about accountability on Kickstarter


  • The WaterColorBot Chassis (already built)
    The lower deck ("spoilboard") of the WaterColorBot
    The WaterColorBot Carriage (already built) with integrated brush holder, brush-lift servo motor, and cable guide
    Two precision stepper motors
    The EiBotBoard 2.0 USB motor controller (readymade)
    USB Cable
    Universal input plug-in power supply (with US-style plug)
    A set of Crayola water colors with brush
    Five sheets of 9x12" watercolor paper
    Three polypropylene water dishes
    Winches, cord, and the X and Y guide rods
    Hex wrench and fasteners
    A quick start guide

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  • The WaterColorBot is designed to work with commonly available watercolor paints and paper, available at any office supply store. Our intention is that the robot lasts for years of service and that no special inks, paints, or other supplies are ever needed.

    In the event that it should be needed for any reason, we do also plan to offer replacement parts for every single component of the WaterColorBot.

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  • The WaterColorBot is designed to fit 9x12" watercolor paper, which is one of the most common sizes at art and office supply stores. Smaller paper including US letter (8 1/2 x 11"), A4, and blank greeting cards can be used as well. We generally recommend putting a full-size (9x12") sheet of scrap paper behind smaller paper sizes, to catch any drips or paint that would have gone over the edge.

    The actual printable area is 8x11", for a 1/2" margin on all sides of the paper. (The total range of motion is somewhat wider than this, as the brush has to also reach the paints and water dishes.)

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  • The WaterColorBot comes with a Crayola watercolor paint set that includes a (small and simple) natural-hair brush. The brush holder on the WaterColorBot has a hole of about 0.4" (10 mm) diameter, so you can use larger brushes (or other writing implements, like pens or pencils) that do fit in the holder.

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  • The cutout on the WaterColorBot's lower deck is designed to fit inexpensive and commonly available 8-color watercolor pan sets, including types from Crayola, Prang, and others. (A full list of supported paint sets will be maintained as part of our documentation.)

    Artist-grade watercolors are supported in a couple of different ways. Once the paint is washed out, the original set of pans can be used as a palette for use with any tube type watercolor paints. We will also be creating permanent accessory multi-well palettes (as optional add-ons) that allow you to use tube watercolor paints or high-quality watercolor half pans (for example, those Winsor & Newton). We may also be able to offer customized lower decks ("spoilboards") designed to fit particular artist-grade watercolor sets or pans upon request.

    While we have not experimented with them, we also believe that liquid watercolors, tempera paints, and watercolor pencils will all work in the WaterColorBot without any particular difficulty.

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  • Yes!

    We have a few different painting modes. For "automatic" painting (especially when filling in large regions), the software automatically goes and gets more paint-- dipping in water, then swirling around in the correct color paint pan --after painting for a certain distance that you can change in the settings.

    For "manual" painting (e.g., drawing a sketch on the screen for real-time painting), you can turn this off, so that it only re-wets the brush when you ask it to (by clicking the paint pan on the screen)-- this is much more like painting by hand. We are still fine-tuning the software before release, but we are likely to leave this as the default mode for real-time sketching.

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  • Our driver software imports vector artwork in the SVG file format. You can use Inkscape to convert from many different file formats (including PDF, Illustrator, and others with the help of extensions) to SVG.

    Starting with image files (e.g., .jpg or .png) is not as straightforward. In the time before launch, we will be exploring different types of options for how best to convert pictures to color vector artwork that can be painted with the WaterColorBot.

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  • You can use a Mac, Windows, or Linux computer. For Linux, only Ubuntu (and close variants) are officially supported. For others, we'll do our best to help.

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  • Yes. Our RoboPaint software includes a RESTful API that can be used to interface with the WaterColorBot. For example, we are currently working towards an iPad app that can control the WaterColorBot in real time, in collaboration with Erin "RobotGrrl" Kennedy ( ). You can also start with any of our example apps (based in Python, Java/Processing, or Javascript), or directly from the EiBotBoard documentation, using any software that can communicate with a USB serial port.

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  • When we asked Sylvia this question, here was her reply: "The WaterColorBot's educational purpose is to help girls, kids, adults and teachers to get into robotics and making. The kit provides opportunities for people to build and learn about computer numerical control and to learn how to program a robot."

    From our perspective, the WaterColorBot is a laboratory for teaching and learning a huge number of topics and principles within the "STEAM" (Science, Technology, Engineering, Art, and Mathematics) umbrella.

    Some of the topics that you may wish to explore (either on your own or in an educational setting) include:

    Science (Physics): Additive and subtractive colors, color mixing, surface tension, wetting to surfaces, thermal conductivity, simple machines, pulleys, winches, force diagrams, tension, friction, the relationship between torque and force, electrical power, strength of materials, flexibility of materials, elasticity. Electrical conductivity experiments and electrostatic boundary value problems (with lines drawn by pencil).

    Science (Chemistry): Solubility, evaporation, chromatography. Potentially electrochemistry (etching and plating) with pen plating and similar setups.

    Science (Biology): Sample preparation, using the WaterColorBot to paint bacteria onto agar or using the WaterColorBot as a pipettor. Painting (e.g.,) moss spores onto surfaces for growth. Painting chemical inhibitors for culture growth.

    Technology & engineering: Lithography (using an etch-resist pen). Printed electronics, using a conductive pen to create circuits. Introducing students to design software, CAD, and numerical control concepts.

    Engineering (Mechanical): Motion control, power transmission, DC and stepper motors, linear translation mechanisms, rotary translation mechanisms, manufacturing processes.

    Engineering (Electrical): Circuit design, microcontrollers, power supplies, voltage regulators, digital logic interfaces, H-bridges and motor control.

    Engineering (Software): Communicate directly with the EBB, or interface with the WaterColorBot API. Introductory programming. Computer graphics. Numerical control. Firmware design. Build your own WaterColorBot software to do one or more of the other projects listed here.

    Art: Make paintings, and explore other media that can be used with the WaterColorBot. Can you do oil paints or pastels? Investigate the differences when translating artwork between different media (e.g., photos, watercolor, sketches).

    Mathematics: Paint tangrams and cut them out. Prove the pythagorean theorem. Geometric constructions. Graphing functions and data. Coordinate systems.

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  • Yes. Once it ships, the WaterColorBot will be a fully open-source project both in terms of hardware, firmware, and software. It's designed to be hackable hardware, to be extended and repurposed, how you see fit.

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  • High resolution photos and contact information are in our press kit: (19.2 MB)

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    THANK YOU! Our sincere thanks, and the opportunity to follow along with project updates.

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    39 backers Limited (161 left of 200)

    ROBO-PAINTED CARD: We'll have the WaterColorBot paint you a thank-you card, and have the humans sign it, too!

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    T-SHIRT: Show your support in a comfy 100% cotton tee, in your choice of size. Front side: Science & Technology & Engineering & Art & Mathematics. Back side: WaterColorBot logo.

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    WaterColorBot (Early Adopter): Get the WaterColorBot in its first production batch. Our goal is to begin shipping this batch 30 days after our campaign is funded.

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    WaterColorBot (Late Adopter): Want a WaterColorBot, but not in a rush? If you select this "Late Adopter" special, we'll ship yours last, so others can get theirs sooner!

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    WaterColorBot, Signature Edition: A special-edition WaterColorBot, signed by its creators, plus the Robo-painted thank-you card and the T-shirt!

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    WaterColorBot Supporter: The rewards from the Signature Edition, plus we will also laser-engrave your name (or your company/organization name) in the list of supporters on the bottom of the Chassis, for every WaterColorBot that ships as part of our Kickstarter campaign.

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Funding period

- (30 days)