PenBot Mini is a credit-card-sized drawing robot that moves a pen using linked arms. Creator Dorian Todd originally began the project with the goal of building a robot to sign a senior yearbook. Along the way, a toaster-sized version drew more than 50 vector portraits of visitors at a 2025 event.

Shrinking the mechanism made even tiny motor inaccuracies visible on paper, so Todd added miniature bearings to its joints and software that calculates and corrects the pen's position.