Visitors at this year’s Toronto Mini Maker Faire were able to effortlessly turn air drawings into plastic sculptures, thanks to a 3D printer and the Leap Motion Controller. Created by Hot Pop Factory, the exhibit brought to life the possibilities of 3D design for people of all ages. We’ll let Hot Pop Factory tell you the full story below:

We had such a blast at this year’s Toronto Mini Maker Faire! For this special weekend event, we revisited one of our favorite childhood activities, finger painting, and updated it to our digital age with a Leap Motion Controller, some 3D printers (of course) and a little bit of home-made code. The result is the 3D Printer Finger Painting booth!

Over the course of two days, we watched the bewildered faces of hundreds of kids, parents, grandparents, and friends as they waved their fingers over the Leap Motion micro sensor, and saw their doodles instantly appear on a digital monitor. The best part of all, is seeing those doodles come to life in 3 dimensions on our 3D printers as funky, abstract sculptures. Read on for a review of our Leap Motion experience.


We are passionate about finding the creative applications of 3D printing. We’re enamored by how 3D printing can empower people from all walks of life to shape the world around them and the products they own. Right now the tools used to create content for 3D printers are often rather archaic and unintuitive for those who are not already experienced 3D designers. The projects that are exciting us most at the moment involve finding new means of interacting with these machines that break down these barriers.

Why Finger Painting?

We knew that Maker Faire would be a busy place with many kids in attendance. Our mission was to create a fun and easy way for people to generate their own 3D content in just a few seconds without any training. Since 3D printing is a new technology, we find it’s very helpful to get people comfortable with it by tying it to a familiar metaphor like finger painting or kissing booths. This allows people to approach 3D printing on familiar terms without being overwhelmed by the technology itself.

Hardware + Software

We used the Leap Motion Controller, Makerbot Replicator 3D printers, and a couple of regular old desktop computers. We tied them all together by writing our own software in Processing. The program we wrote allows people to generate colorful 3D models on the screen using their fingers and the Leap Motion Controller. We then exported these models to the 3D printers using standard file formats so that they could be reconstructed in real life.


The response at Maker Faire was fantastic! It drew crowds throughout the weekend. I think the most rewarding part was seeing how many people were able to use it without any instruction – especially kids. Our favorite finger painter was a little boy who was convinced that clapping his hands and spreading his little fingers out like a fan resulted in explosion of cubes on the doodle screen. It was really the speed of his motion that the program responded to, but he was having so much fun creating with his big clapping gestures, all we could do was sit back and smile. We loved seeing how different people approached the sensor and learned to self-navigate our program on their own terms, bringing their own personality.

Future Applications

What’s nice about the Leap Motion Controller is that casually interacting with the computer becomes a very low cost investment of time and attention for a passerby at a busy venue like Maker Faire. People don’t have to waste time fumbling around with a keyboard and mouse – this is a big part of why we chose it for this event. For 3D printing in particular the Leap Motion Controller is especially interesting, because unlike a mouse, which moves around on a 2D plane, it’s specifically equipped to interpret 3D input. This helps alleviate one of the major pain points in getting new users to create 3D content, which is navigating 3D space on a 2D screen with a 2D input device.

3D Printed Leap Motion

3D Printed Heart Leap Motion

3D Printing Finger Painting Leap Motion

Hot Pop Factory Maker Faire Leap Motion

Hot Pop Factory experiments with 3D printing, software, and form to create printed jewelry. This post originally appeared on their blog, where they showcase their ongoing 3D art innovations.