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Building a mini PC in an NES case is practical, but “NES case” can mean three different projects: a full-size original or 3D-printed shell holding Mini-ITX hardware, a scaled Raspberry Pi replica such as the Retroflag NESPi 4, or an NES cartridge containing a Pi Zero. Their parts, tools, cooling and software are not interchangeable. For the easiest assembly, use a Raspberry Pi 4 with a Pi 4-specific replica case. For desktop-class Windows or Steam software, use a Mini-ITX board in a full-size shell. For the smallest build, use a Raspberry Pi Zero 2 W in a common cartridge and expect to cut the plastic.
Start by choosing the enclosure path, then test the computer outside the shell, plan every port and ventilation opening, and protect the microSD card before seating any Raspberry Pi. The procedures below cover the documented parts, dimensions, wiring and failure points for each route.
Which NES-case computer should you build?
| Name | Best for | Key spec | Platforms | Checked |
|---|---|---|---|---|
| Original NES sleeper | Windows, Steam and light 1080p gaming in a full-size shell | About 10 × 8 × 3.5 inches; Mini-ITX with low-profile graphics | x86 Mini-ITX | Oct 2026 |
| Replica NESPi or 3D-printed Mini NES | Fastest retro-console build | NESPi 4: 114.65 × 143.37 × 53.7 mm; Raspberry Pi 4 only | Raspberry Pi | Oct 2026 |
| NES cartridge | Small shelf display, portable emulator or custom handheld | Raspberry Pi Zero 2 W; 3.8 mm gamebit and shell cutting required | Raspberry Pi | Oct 2026 |
What does “NES case” mean for a mini-PC build?
An original Nintendo Entertainment System shell is a full-size donor enclosure. Its exterior is approximately 10 inches wide, 8 inches deep and 3.5 inches high according to a 2026 builder measurement; a separate 2023 build records a 260 mm length for a full-size printed shell. Those are builder measurements, not Nintendo service-manual dimensions. Sloping interior walls reduce the usable floor, so a board that appears to fit the outside footprint can still collide with the shell.
A scaled replica is roughly 40–45 percent of the original console. The Retroflag NESPi 4 measures 114.65 × 143.37 × 53.7 mm in a 2020 GBAtemp review and is designed only for Raspberry Pi 4. Older “Old Skool” style cases for Pi 3, Pi 2 and Model B boards are a different product, measuring about 3.7 × 3.5 × 1.7 inches in a 2017 review.
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An NES cartridge is a third enclosure altogether. It has room for a Pi Zero-class board, short cable extensions and a small controller or display circuit, not a Mini-ITX motherboard. Do not reuse the console-shell parts list for a cartridge project.
How do you build a Mini-ITX PC in an original NES shell?
Use an APU or low-profile graphics card, a short cooler, and a pico-PSU or fanless GaN supply. The shell must be cut for rear I/O, front USB and ventilation, and the final layout should be designed around those openings before you buy parts.
Parts that have been documented in a full-size build
- AMD Ryzen 5 5600X six-core processor with its Wraith Stealth cooler.
- Gigabyte B550I AORUS Pro Mini-ITX motherboard.
- 32 GB DDR4-3200 memory and a 1 TB NVMe drive.
- Gigabyte GeForce RTX 560 low-profile graphics card with 8 GB of memory, as specified by the 2026 builder.
- HDPLEX fanless 250 W GaN ATX supply, reported by that builder at about $150, plus a suitable input brick or mains arrangement.
- An NES donor shell or a full-size printed replacement. One donor console in the documented build cost about $10 at a garage sale.
A lower-heat alternative is the 2023 full-size printed HTPC: Ryzen 5 5600G integrated graphics, an ASRock B550 M-ITX/ac board, two 16 GB DDR4-3600 modules, a 1 TB Teamgroup PCIe 3.0 M.2 SSD, and an RGEEK 250 W pico-PSU with a 120 W brick. That builder used two 40 mm Noctua fans, side vents, a rear I/O cutout, a 5.5/2.5 mm DC jack and USB 3 panel cables in place of the original controller ports. The 120 W brick surviving Prime95 and FurMark was that builder’s result, not a universal rating for every configuration.
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- Measure the shell’s real floor. Account for the inward slants and the cartridge-slot structure. Leave clearance around RAM latches, the CPU cooler and any GPU shroud.
- Choose the I/O face. Mark the motherboard rear I/O shield, HDMI or DisplayPort, DC inlet, and front USB panel before drilling. The original controller openings are useful for USB, but their spacing does not automatically match a PC panel.
- Set the power architecture. A conventional ATX supply is too large. Use a pico-PSU with its correctly rated brick or a fanless 250 W-class supply; verify the total CPU and GPU draw against the supply’s specification.
- Prototype the layout. Place the board, storage and cooler on cardboard or a printed mock-up. Trim screw posts in small passes with a rotary tool rather than removing all supports at once.
- Provide airflow. The stock shell is a closed plastic box. Add side or underside vents and mount intake and exhaust fans where their frames will not touch the lid.
Assembly sequence
- Strip the donor console or print both shell halves. Keep the original switches if you want authentic power and reset controls.
- Cut a clean rear opening for the I/O shield and display connector. Test-fit the shield repeatedly; the opening must not force the board sideways.
- Remove only the internal posts that collide with the Mini-ITX board. Preserve posts that can support standoffs or the bottom panel.
- Install the processor, cooler, memory and NVMe drive on the motherboard while it is outside the shell.
- Fit the motherboard and low-profile GPU, then route the DC input and front USB cables. Do not close the clamshell over a cable bend that presses on a connector.
- Install vents and fans, checking that the lid still clears the tallest component. Use the original bottom screw direction or a printed bottom plate for serviceability.
- Boot the system open on a nonconductive surface, confirm display output and storage detection, then close the case and recheck every switch.
Do not assume a full-height graphics card, ATX supply or tower cooler can fit. No independent thermal-lab result was found for an original-NES Mini-ITX sleeper, so component temperatures must be measured for the finished build rather than borrowed from another enclosure.
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How do you assemble a Retroflag NESPi 4 with a Raspberry Pi?
The NESPi 4 is the shortest path from parts to a working replica console: it includes the shell, a Pi 4 heatsink and fan, a 2.5-inch drive enclosure, screws, a screwdriver and a 5 V 3 A USB-C supply. The cited review describes it as Pi 4-only, not backward-compatible with earlier Raspberry Pi generations. Its front panel exposes two USB ports, power and reset; the rear provides dual micro-HDMI, 3.5 mm audio, USB-C power and an RJ45 pass-through.
What the NESPi 4 provides
- Case dimensions of 114.65 × 143.37 × 53.7 mm, approximately 45 percent of a full-size NES.
- Included heatsink, fan and thermal pads.
- 100–240 V input, 5.0 V 3 A USB-C supply with an approximately 120 cm cable.
- A cartridge-style bay for a 7 mm 2.5-inch SSD connected by USB 3. The Pi has no native SATA controller.
- Only two of the Pi’s four USB ports are brought to the exterior; a daughterboard blocks one USB 2 port.
- A microSD opening on the right side and a red status LED that blinks during shutdown or reboot.
GBAtemp listed a street price of $39.99 in 2020. That is a historical figure, not a current October 2026 price; check the live listing before budgeting.
Exact NESPi 4 installation steps
- Prepare the software outside the case. Flash an operating-system image to the microSD card, boot the Pi on the bench, and install safe-shutdown scripts if you want the front power button to stop services instead of abruptly removing 5 V. The RetroFlag scripts are published at https://github.com/RetroFlag/retroflag-picase/.
- Turn on the internal toggle. Set the case’s internal power switch to On before fitting the board.
- Apply the thermal pads. Remove both protective films and place the pads on the Pi CPU, memory and Wi-Fi areas as shown in the manual.
- Remove the microSD card. This is mandatory before insertion. The card can catch on the case and damage the board or snap when the Pi slides into position.
- Connect internal cables. Plug in the USB and RJ45 leads, then lower the Pi at an angle, using the HDMI and audio openings as guides. Seat the screw holes without forcing the board.
- Fit the GPIO cable. With the front buttons facing you, place the tagged conductor toward the bottom-right corner and attach the five-pin header.
- Install the cooler. Drop the heatsink over the pads, connect the fan with red on positive, and fasten the two 15 mm screws beside the GPIO header.
- Route the USB 3 lead. Bring it from the top, close the lid and install the six 20 mm case screws.
- Install the SSD enclosure if used. Use the shortest screws plus the two side screws, insert the drive until it clicks, and remember that the leftmost HDMI opening is HDMI 0 even though the case does not label it.
- Reinsert the microSD card last. Boot, test safe shutdown and verify that the SSD appears before loading a large game library.
For a Pi 4, use the supplied fan and 5 V 3 A supply rather than assuming a phone charger is adequate. Mechanical 7 mm drives can fit the bay, but the enclosure is not ventilated; an SSD is the quieter, lower-risk choice.
What about older or 3D-printed replica cases?
The older NESPi and NESPi+ designs use a different board layout and smaller dimensions of about 93.5 × 119.5 × 45.1 mm. Electromaker’s assembly order is USB and Ethernet first, align the I/O with the cutouts, attach the GPIO cable, secure the Pi and install the bottom screws. The board has one practical orientation, so do not rotate it to make a cable reach.
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A DaftMike-style 3D-printed Mini NES is about 40 percent of the original and was documented with a Raspberry Pi 3 Model B. A Westaby clone kit adds custom USB and front-panel PCBs, a Pro Micro, optional PN532 NFC reader and NTAG216 tags, power and reset switches, a 3 mm LED and an optional 25 mm fan. Remove the microSD card before inserting or removing the Pi: the case defect can snap the card in half. In that kit, the Pro Micro’s fuse/diode must be shorted to let the Pi draw more than 500 mA; after that modification, do not reconnect the Pro Micro to a computer.
How do you put a Raspberry Pi inside an NES cartridge?
Use a common, duplicate, cracked or dead cartridge rather than a rare game. A Pi Zero 2 W is the easiest current fit because it is thin and wireless; a Pi 3A+ is a middle ground, while a Pi 4 needs more cutting, heat management and port extensions. A Pi 5 is generally a poor cartridge fit unless you add active cooling and accept major modifications.
Parts and tools
- Raspberry Pi Zero or Zero 2 W, preferably without headers when space is tight.
- 3.8 mm NES security-bit screwdriver (gamebit), Phillips screwdriver and flush cutters.
- Short or right-angle mini-HDMI and USB power extensions.
- 5 V supply appropriate to the board; Adafruit’s Pi Zero guide specifies approximately 2.4–2.5 A.
- MicroSD card, USB OTG adapter and, for the Adafruit layout, a Joy Bonnet, 2×20 male header and double-stick foam tape.
- Hobby knife, files, sandpaper, painter’s tape, pin vise or step bits, optional rotary tool, nylon M2.5 standoffs and zip ties.
- Optional heatsinks and a 30 or 40 mm 5 V fan. Use eye protection and a dust mask when cutting ABS or styrene.
Basic cartridge build
- Remove the three security screws with the 3.8 mm gamebit and take out the original ROM PCB. Keep the PCB and label stored separately.
- Trace the Pi Zero in the lower shell. Mark the inner lip that blocks the HDMI, power and USB openings.
- Cut the lip in short passes. ABS and styrene melt when overheated, so let the plastic cool instead of leaning on a rotary bit.
- Build the board height with stacked foam tape or nylon standoffs. Do not let the cartridge screws clamp the Pi directly.
- Cut a matching clearance in the upper shell and, if using a Joy Bonnet, open a window for its GPIO header. A heated blade can make the opening, but keep the tool moving and work in a ventilated area.
- Install the Pi, extensions and controller board, then insert the microSD card before closing the shell. The Adafruit design uses the cartridge as a wired controller through the Joy Bonnet.
- Close the shell with the original three screws, connect the power supply and test HDMI, buttons and audio before adding adhesive or a display.
- Transfer additional games with a USB stick through the OTG adapter after the system boots.
Advanced cartridge variations
The 2024 “NinTARDIS” project demonstrates how far the cartridge format can be pushed: a Pi Zero 2 without headers, a 4-inch capacitive touchscreen, vibration motor, USB audio DAC, 8-ohm speaker, PowerBoost 1000C, 1,200 mAh LiPo, USB hub and sensors. It reported a 600-game library, but that figure belongs to that particular build and software image. The builder documented that heat from Gorilla Glue warped the shell near the PowerBoost and used a heatsink afterward; do not use glue as a substitute for a mechanical mount.
Laser-cutting ABS is a poor choice because of toxic fumes. Dremeling or hand-cutting with short passes is slower but avoids concentrating heat along the entire shell.
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Which operating system should you install?
For Raspberry Pi builds, choose a distribution that matches the exact board. Flash and boot it before final assembly, expand the filesystem and configure networking while the ports are accessible.
| System | Strength | Trade-off | Typical transfer method |
|---|---|---|---|
| RetroPie | Largest community and the most shader and package options | More settings to configure | SMB share, USB stick or SSD; USB instructions are at https://retropie.org.uk/docs/Running-ROMs-from-a-USB-drive/ |
| Recalbox | Beginner-oriented interface with Kodi included | Less package-level customization than RetroPie | Network share or external storage |
| Batocera | Simple setup and external-drive ROM folders | Different menus and file layout from RetroPie | External storage or network copy |
| Lakka | RetroArch/XMB gaming-only environment | No Kodi media-center layer | Network or removable storage |
RetroPie uses the network share \retropie (or smb://retropie on systems that use that notation). Recalbox and Batocera can use external storage, while the NESPi 4’s USB 3 SSD bay is useful for a large library. Use ROM files made from games you physically own; do not download or distribute unauthorized copies.
A Mini-ITX sleeper can instead run Windows or a Linux desktop and use ordinary PC game stores, which avoids the cartridge-style ROM workflow. The operating system choice should follow the hardware path rather than forcing a Pi image onto an x86 board.
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- Match the supply to the board. The NESPi 4 kit specifies 5 V 3 A for a Pi 4. The Adafruit Pi Zero cartridge guide specifies approximately 5 V at 2.4–2.5 A. Undervoltage can cause crashes and microSD corruption.
- Keep Pi airflow local. Use the NESPi 4’s supplied heatsink and fan. A Zero 2 W generally produces less heat than a Pi 4 or Pi 5, but a cartridge may still need a small heatsink or 30/40 mm fan if it is enclosed tightly.
- Vent a Mini-ITX shell. An APU reduces heat and eliminates a graphics-card riser, while a low-profile GPU needs direct intake and exhaust paths. Do not publish or rely on a precise temperature target without measuring your own enclosure.
- Use controlled shutdown. A front switch that simply disconnects 5 V can corrupt the filesystem. On supported replica cases, install the manufacturer’s shutdown scripts and test the button with the system idle and under disk activity.
- Relieve cable strain. Right-angle HDMI and power extensions reduce pressure on cartridge shells and replica cutouts. Add heat-shrink to soldered splices and keep wires away from fan blades.
What tools are needed for each path?
| Tool | Where it matters |
|---|---|
| 3.8 mm NES gamebit | Opening cartridges and many original-style shells without damaging security screws |
| Phillips screwdriver | Replica-case screws, cartridge hardware and board mounting |
| Rotary tool, hobby knife and files | Rear I/O, vents, cartridge lips and internal-post removal |
| Painter’s tape and marker | Protecting labels and marking cut lines |
| Nylon M2.5 standoffs and foam tape | Supporting Pi boards without shorting or crushing them |
| Soldering iron | Kit-specific power, Joy Bonnet headers and advanced cartridge wiring |
| Eye protection and dust mask | Any cutting or sanding of ABS, styrene or printed plastic |
What commonly goes wrong, and how do you recover?
| Symptom | Likely cause | Recovery |
|---|---|---|
| Pi will not seat in a replica shell | MicroSD card still installed or HDMI/audio alignment is off | Remove power, pull the card, inspect the slot and insert the board at the documented angle. |
| Card is cracked or the Pi binds | Card was left in during insertion or a case lip catches it | Stop forcing the board; replace the damaged card if needed and file only the interfering lip. |
| Random crashes or corrupted games | Undervoltage, abrupt power removal or an undersized brick | Use the rated supply, install safe shutdown and check the power cable and solder joints. |
| No display on a NESPi 4 | Wrong micro-HDMI port or an unseated internal cable | Try the leftmost port (HDMI 0), reseat the cable with power removed and test the Pi outside the shell. |
| Lid will not close | RAM heatspreaders, GPU shroud, fan wires or a cable bend exceed the 3.5-inch shell height | Re-route cables, use a shorter cooler or low-profile card, and trim posts in small increments. |
| Cartridge plastic is soft or warped | Long rotary-tool passes or heat-producing adhesive | Let the shell cool, switch to hand tools and use mechanical standoffs instead of thick glue near power electronics. |
| Fan spins but temperatures rise | Vents are blocked or both fans are exhausting the same cavity | Open a separate intake and exhaust path and confirm airflow direction before closing the case. |
Can you keep the original NES controls and preserve the console?
Replica cases normally expose front USB ports for wired NES-style pads, and Bluetooth pads work when the Pi’s wireless hardware and operating system support them. Reusing an original NES controller port requires an additional interface circuit; it is not a drop-in feature of the NESPi 4.
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A printed full-size shell preserves a working donor console because no original plastic is cut. If you modify a real NES, photograph the board and store removed parts so the project can be reversed where practical. For cartridges, choose a common or defective donor and retain its original PCB and label rather than sacrificing a rare game.
How we picked these build paths
The three paths are separated by enclosure volume, computer board, cutting requirements, expected performance and preservation impact. The Mini-ITX route is included because a full-size NES can accommodate x86 hardware when the GPU, cooler and PSU are low-profile. The replica route is ranked as the easiest assembly because the case, cooling and power accessories are designed around a Pi. The cartridge route is treated as a related compact project because its board, power and port constraints are fundamentally different.
Frequently Asked Questions
Can a full-size NES shell be printed on a normal 250 mm printer?
A documented 260 mm-long shell required an Ender 3 Max with a 300 mm bed because common 250 mm printers could not print it in one piece. Plan to split the model or use a larger printer if your bed is smaller.
Is a Raspberry Pi Zero 2 W wireless enough for a cartridge build?
Yes. Its onboard wireless networking removes the need for an Ethernet opening, which is one reason it leaves more room for right-angle cables and a small controller board. You still need to configure Wi-Fi before the cartridge is permanently closed.
Can I use a Pi 4 in an NES cartridge?
It is possible, but the board needs more interior cutting, port extensions and active heat management than a Zero 2 W. The cartridge’s shallow shell gives the Pi 4 little room for a cooler or safe cable bends.
What happens if the NESPi 4 power switch is used without shutdown software?
The switch can remove power while Linux is writing to the microSD filesystem, producing boot errors or lost configuration. Install the case’s shutdown scripts, then allow the status LED to finish its shutdown pattern before disconnecting power.
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