An Automated Paper Cutter
As you can see in the video below, a user simply inputs the length of paper and the number of strips needed via a series of buttons and a tiny OLED display, and the automated machine does the rest.
The system works by pulling paper inserted into the machine’s body at precise intervals using a stepper motor and rollers. When in place, a second stepper moves a razor blade over the paper, cutting it into perfect strips for whatever craft project you have in mind. An Arduino Mega controls the device, along with a pair of stepper drivers via a custom designed PCB shield. Code and PCB files are available here for download.