A Ford Festiva was split down the middle and rebuilt into a car 10 feet (about 3 meters) wide. New floor and roof sections fill the expanded middle, and the cabin has two steering wheels.

The creators at Prop Department obtained a special wide-load permit and filmed both the build and the finished car driving on public roads.

To beat a friend who keeps winning at badminton, Jack Saito built a motorized racket that spins rapidly to hit shuttlecocks. A single racket vibrated too violently, so he mounted a second one on the opposite side to balance the mechanism. Powered by an electric-skateboard motor and batteries carried in a backpack, it returned shots on court, but ran out of power before he could win.

Inventor Kazuya Shibata built the Portable Ice Keeper, a freezer designed specifically to transport a single ice cream without melting it. He presents the creation as part of his series of barely useful inventions.

Maker DocJade developed a custom file system to load the game Factorio from a large collection of floppy disks. Files are split across disks, and the user must manually swap in the disk requested during loading.

With only one drive, swapping disks becomes the main bottleneck. Even after optimizing the system to reduce swaps, loading the game takes about a week.

Electron Dust built the Hexa-Bouncer to keep a ping-pong ball bouncing on a moving platform. Two cameras track the ball while six arms move and tilt a triangular platform to meet its predicted landing point.

According to the creator, the machine uses a Teensy 4.0, six geared NEMA 23 stepper motors, six motor drivers, a 36 V 14 A power supply, two cameras and a GPU-equipped Windows PC. The image-recognition and motor-control software are custom-built, and the many aluminum parts were machined on a desktop CNC.

Photon Matrix is a device that detects flying mosquitoes and other small insects and knocks them out of the air with a laser. It scans a six-meter-radius, 90-degree sector with LiDAR 50,000 times per second and is described as detecting flying objects 2–20 mm long moving at up to 1 m/s. After AI vision confirms a target, the laser fires within 0.003 seconds.

A millimeter-wave radar stops the laser when larger objects such as people or pets approach. Its companion app also includes a mosquito kill-count ranking. The system was developed by Changzhou Photon Matrix Intelligent Technology in China.

The Fully Automated Motomura Shichimi Sorting Machine separates the chili peppers from shichimi, a Japanese seven-spice blend, to produce ichimi, or single-spice chili pepper seasoning. It is designed to sort different types of ingredients.

The machine also incorporates Pockét YUZAN, a large language model that predicts the comments of Kaibara Yuzan, a gourmet character from the manga Oishinbo. Its creators, the five-member group Bishoku Club, work on recreating the labor-intensive food preparation depicted in the manga using modern technology.

See the Motomura Shichimi sorting machine section in the linked report.

A fully FDM-printed mechanical calculator performs addition and multiplication by setting digits and turning a hand crank. It uses no electronics; rotations through printed gears perform the calculation, including a mechanical carry mechanism.

3D All Workshop spent about two months developing the design. Because FDM-printed gears are sensitive to tolerances, the mechanism went through roughly one hundred design iterations before it worked reliably.

A custom version of the roughly 12 cm cube Kubb Fanless mini PC has been built with a chassis made from solid 24-karat gold rather than gold plating. The standard model weighs about 2.1 kg, while the gold version reaches about 13 kg and costs roughly $1.7 million.

Because the fanless PC uses its chassis as a heatsink, gold's high thermal conductivity does provide a cooling benefit. GIGAZINE notes, however, that copper and silver conduct heat even better, so gold is not the optimal material if cooling alone is the goal.

The Long Clock uses a roughly 2.3-meter rail mounted on the ceiling, with a single hand slowly traveling along it to show the time. It was built so children watching movies would notice time passing through a large visible mechanical movement rather than an alarm.

Mechanically, it is essentially a one-axis CNC machine. The build reuses a roughly three-meter aluminum extrusion, linear rails, a stepper motor and other parts salvaged from older projects. A carriage moves the pointer along an elongated clock face. It was created by freefoote.

The original 1993 DOOM has been rebuilt so that its game logic and graphics run in SQL inside a database. The game loop runs at the original 35 FPS, while the database can produce the complete 320×200 frame buffer at up to 60 Hz. The project was created by a team at CedarDB.

The renderer alone takes about 1,300 lines of SQL, with roughly another 4,000 lines for the rest of the project. Python only handles keyboard input, timing and displaying the bitmap returned by the database, and multiplayer deathmatch works too.

For his student final project, Jude Robinson built Daisy, a robot that automatically makes literal daisy chains. Two opposing XY gantries with grippers alternate handling flowers, taking each daisy from a conveyor and threading its stem through the previous flower.

The machine makes a short slit in each newly added stem, then places a thin threading post through the opening to prepare for the next flower. Because daisy stems vary in shape and diameter, V-shaped grippers and other mechanical constraints keep the process aligned without relying on sensing.