[SQFMI] creates an E-Ink clock.
[Jean Simonet] creates RGB LED "smart" dice called Pixels Dice.
The dice know their orientation when they land and can light up accordingly. They can communicate back their position, opening the possibility of novel interfaces, such as speaking which face they landed on, and allowing custom light patterns for different rolls.
[Jean Simonet] has videos on the creation process, including solder, casting and testing the dice.
[Mike Rankin] creates a tiny laser cutter.
Source is available on GitHub.
Details are light but [sailorhg] creates cute computer cases and keyboards.
bubblesort.io has more information as well.
[Sean Hodgins] creates a volumetric OLED display.
[Naomi Wu] creates a cyberpunk ultrasonic microphone jammer that uses ultrasonic transducers to jam nearby microphones.
Source code and design files are open source and available on GitHub.
[Sam Underwood] is working on an experimental bellows instrument.
[llvllch] creates a daily basic-bitch quote machine.
[Chris Courses] creates an automated water dispenser
Though the details are light, [s3msify] creates an automated drink mixer.