Featured project Retro Computing
Apple II Rev 0 Reproduction Kit
Reproduction of the 1977 Apple II Rev 0 motherboard: bare PCB, tested parts kit or fully assembled, with 4164 RAM adapter and build guide.
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Featured project Retro Computing
Gigatron TTL Microcomputer DIY Kit
Build an 8-bit computer from TTL chips with no microprocessor: VGA graphics, sound, games and BASIC. Kit or assembled, optional wooden case.
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Featured project ESP32 & Electronics
Morse Code Trainer Card — LED Path Guidance and Recorder
Pocket-sized Morse code trainer with LED path guidance, a real Morse key, and record & playback. Learn Morse the visual way.
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Featured project Retro Computing
ZX80 Replica with 3D-Printed Case V2
Version 2 ZX80 replica: ROM-compatible Z80 + TTL re-creation of the 1980 Sinclair, tactile keyboard, 3D-printed case. Kit or assembled.
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Featured project ESP32 & Electronics
ESP-SparkBot AI LLM Desktop Robot Kit
Espressif's open-source ESP32-S3 desktop robot: LLM voice chat, camera and face recognition, games, magnetic tracked base. Kit or assembled.
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Featured project Machine Tool Models
Mechanical Punch Press Model – 3D-Printed, USB-Powered, Working Gear Train
A 180 mm 3D-printed open-frame punch press: plug it into USB and the motor turns the gears, flywheel and ram just like the real machine.
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Featured project Arduino Maker Projects
Drawbot Wall Plotter Kit for Arduino – String-Driven Drawing Robot with Stepper Motors
Two stepper motors pull a pen holder on strings across a wall or whiteboard to draw pictures from G-code or vector files.
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Featured project STEM Science Kits
GoolRC Mini RC Submarine
A compact 2.4GHz remote-control submarine for water demos, control practice, and mechanism exploration.
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Featured project Retro Computing
Apple II Floppy Disk Emulator
SD-card Disk II emulator for the Apple II: replaces the floppy drive, choose disk images on a 0.96" OLED with three buttons.
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Retro Computing Kits, ESP32 Boards & STEM Science Kits
Mematrix is a small DIY hardware lab: Apple II and TTL computer kits, ESP32 gadgets, Arduino maker projects, machine tool models and hands-on science kits, from a small maker team that started in a student maker space.
- 1,000+ items sold each year across our stores
- Worldwide shipping
- Custom work available
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Shop by category
- Desk Display & Engineering GiftsThings that look great on a desk or shelf and start conversations: machine models, retro replicas and working mechanisms.
- Projects for Teens & Makers (12+)Bigger builds for teenagers and adults: Arduino machines, ESP32 gadgets, electronics labs and computers built from logic chips.
- Gifts Under $25Affordable hands-on science kits and maker gifts, all under $25.
- Parts Packs for MakersEvery electronic-component and mechanical-parts pack in one place. Buy any 3 or more in one order and save 10% on all of them.
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Best sellers
Our most-ordered kits and boards, built and shipped to makers around the world.
Apple II Rev 0 Reproduction Kit
From $142.20
OptionsGigatron TTL Microcomputer DIY Kit
From $77.07
OptionsApple II Floppy Disk Emulator
$25.20
Apple II VGA Adapter
$19.71
HALO TOUCH USB Hub Dock with Clock V2
$69.29
ESP32 S3 AIoT all in one
From $58.00
Options
FakePod Nano – CNC Aluminum AMOLED Audio Player
$63.91
Universal ITX Backplane
From $14.40
Options
From a student maker space to your workbench
Mematrix is run by the team behind innoelement (創元素), a maker space that engineering students started in a rented village house outside Guangzhou University Town, with no funding and a shared wish to understand how things work by making them.
Retro Computing
Apple II boards and cards, TTL computers you build chip by chip, and faithful replicas of classic machines.
ZX80 Replica with 3D-Printed Case V2
From $80.10
Options
GamePad for Apple II
$19.80
4Bit TD4 CPU Self-made 74 Series Chip CPU
From $30.60
Options
SCSI to SD Adapter for Macintosh BlueSCSI v1
From $16.20
OptionsESP32 & Electronics
ESP32 devices and development boards, electronics learning kits, and the modules and parts that go with them.
HALO TOUCH USB Hub Dock with Clock V2
$69.29
ESP32 S3 AIoT all in one
From $58.00
OptionsFakePod Nano – CNC Aluminum AMOLED Audio Player
$63.91
ESP-SparkBot AI LLM Desktop Robot Kit
From $81.10
OptionsArduino Maker Projects
Laser-cut wooden and acrylic project kits built around Arduino: machines that draw, sort, play games and follow the sun.
Drawbot Wall Plotter Kit for Arduino – String-Driven Drawing Robot with Stepper Motors
From $47.00
Options
MiniRadar Kit for Arduino – Ultrasonic Radar Scanner with TFT Display, Laser-Cut Wood
From $47.00
Options
Plotclock Writing Clock Kit for Arduino – Wooden Robot Arm That Writes the Time
From $44.00
Options
MiniArm Robot Arm Kit for Arduino – 4-Servo Acrylic Desktop Arm with Gripper
From $51.00
OptionsMachine Tool Models
Detailed 3D-printed scale models of industrial machine tools, several with working motors and moving parts.
Mechanical Punch Press Model – 3D-Printed, USB-Powered, Working Gear Train
$43.00
APC-200 Double-Crank Press Model – 3D-Printed Straight-Side Press, Rechargeable
$105.00
YC1-250 Punch Press Model – 3D-Printed Straight-Side Press with Dial and Motor
$61.00
Options
Surface Grinder Model – 3D-Printed Motorized Grinding Machine, USB-Powered
$99.00
OptionsSTEM Science Kits
Boxed hands-on science experiments for children aged about 8 to 14, at home, in the classroom or at a science club.
Magnetic Levitation Kit – DIY Floating Ball with Electromagnet & Light, STEM Model
$25.00
Gear Combination Kit – Hand-Crank Gears, Chain, Belt & Worm Drive STEM Model
$11.00
DIY Camera Kit – Build a Twin-Lens Reflex Film Camera, Optics STEM Model
$15.00
Wind Robot Kit – Wind-Powered Walking Robot, Gear & Crank STEM Model
$31.00
Electronic Components & Packs
Assortment boxes and packs of through-hole parts for breadboards, repairs, classrooms and your own builds.
1818-Piece Electronic Components Kit – Resistors, Capacitors, LEDs, Transistors, Diodes and Regulators
$23.00
TTL Logic Chip Pack – 74HC and 74LS DIP ICs with IC Sockets, Voltage Regulators and Crystals (281 Parts)
$23.41
Diode and Zener Pack – 1305 Rectifier, Fast-Recovery, Schottky and Zener Diodes with 78Lxx Regulators
$27.42
Resistor and Capacitor Pack – 3120 1% Resistors, 630 Electrolytic and 960 Ceramic Capacitors (4710 Parts)
$34.49
Mechanical Parts & Packs
Screws, standoffs, heat-set inserts and other hardware for mounting boards, finishing 3D prints and building your own machines.
Screw & Standoff Hardware Pack – M2–M4 Screws and Nuts, Self-Tapping Screws, Brass Standoffs, Heat-Set Inserts
$49.46
Springs, Gears, O-Rings & E-Clips Pack – 200 Springs, 200 FKM O-Rings, 120 E-Clips, 200 Module-0.5 Gears
$29.04
Micro Shaft & Coupler Pack – 130 Steel Shafts 1–3 mm, Brass Couplers, Flange Couplings, Shaft Collars and Hex Keys
$35.80
Motor Mount & Bracket Pack – 130 Motor Clamps and Mounts, Aluminium Corner Brackets, Perforated Plates, Mini L Angles
$27.26
New arrivals
The latest kits and models added to the shop.
Connectors & Wiring Pack – PH 2.0, ZH 1.5 and GH 1.25 mm Connector Kits, 300 Jumper Caps, 328 Heat-Shrink Pieces
$22.26
Maker Essentials Pack – 500 LEDs, 20 Potentiometers with Knobs, 200 Inductors, XH2.54 Connectors, 360 Fuses
$34.64
Sensor and Special Resistor Pack – Photoresistors, NTC Thermistors, Varistors and Resistor Networks (435 Parts)
$22.07
Horizontal Machining Center Model – 3D-Printed Inverted-T Machine with Moving X/Y/Z Axes and Rotary Table
$89.00
APA-110 Punch Press Model – 3D-Printed C-Frame Press with Moving Slide, Rechargeable
$87.00
CNC Machining Center Model – 3D-Printed Desktop Replica of a Vertical Machining Center
$119.00
Go Stone Sorter Kit for Arduino – Automatic Black & White Sorting Machine, Laser-Cut Wood
$54.00
Colour Sorting Machine Kit for Arduino – Colour Sensor, TFT Screen & Stepper Turntable
$78.00