MEAN WELL LRS-350-24 350.4W 24V 14.6 Amp Single Output Switchable Power
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AI Verdict
A reliable, budget-friendly 24V power supply that serves as the gold standard for 3D printer upgrades and DIY LED projects, provided you don't mind a noisy cooling fan.
This unit delivers its rated 350W continuously and fits in tight spaces thanks to its 30mm thickness. It provides reliable 24V DC power for DIY projects and 3D printer upgrades, backed by proven long-term electrical stability.
If you need completely silent operation, look at the Mean Well UHP-350-24, which is fanless and relies on conduction cooling.
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Pros
- Delivers 350W (14.6A) of continuous 24V power without voltage sag
- Voltage adjustment potentiometer lets you dial the output anywhere from 21.6V to 28.8V
- 30mm (1U) profile fits easily under 3D printer frames or inside shallow project boxes
- Built-in short circuit, overload, and over-temperature protections actively prevent electrical fires
- Massive community support provides hundreds of free 3D printable mounting brackets and terminal covers
Cons
- The stock 60mm cooling fan hits 34dB and sounds like a tiny jet engine when it kicks on
- Exposed AC screw terminals require a custom safety cover to prevent accidental shocks
- Manual 115V/230V toggle switch is recessed and easy to miss, leading to under-voltage issues
- Fan is hardwired to a thermostat and cannot be controlled via PWM or external software
Dimension Scores
Delivers a highly stable 24V at 14.6A with up to 89% efficiency and minimal ripple.
The 34dB stock fan is aggressively loud and kicks on abruptly when the thermostat triggers.
Features a rugged aluminum enclosure that withstands 5G vibration and includes robust electrical protections.
Standard screw terminals get the job done, but lack any included strain relief or safety shrouds.
Best For
- Upgrading underpowered stock 3D printer power supplies (like the Ender 3 or Prusa MK3)
- Powering long runs of 24V LED strip lights for under-cabinet or architectural lighting
- DIY CNC routers and laser engravers requiring stable 24V DC power
Not Recommended For
- Silent environments where sudden, loud 34dB fan noise would be distracting
- Beginners who aren't comfortable wiring bare AC mains cables to screw terminals
Watch Out For
- The input voltage switch defaults to 230V — if you live in North America and forget to flip it to 115V, your machine will randomly restart when under load.
- The cooling fan is notoriously loud; many owners void the warranty immediately to swap in a quieter 60x60x15mm 12V fan.
- There is no included power cord or plug; you have to wire your own AC mains cable to the bare terminals.
- If you are upgrading a 12V 3D printer, buying this 24V unit will fry your fans and heater cartridges.
Full Specifications
| ASIN | B013ETVO12 |
| Brand | MEAN WELL |
| Wattage | 350 watts |
| Form Factor | Enclosed |
| Item Weight | 1.64 pounds |
| Manufacturer | MEAN WELL |
| Connector Type | ATX |
| Cooling Method | Air |
| Output Wattage | 350 Watts |
| Item model number | LRS-350-24 |
| Compatible Devices | Personal Computer |
| Product Dimensions | 8.46 x 1.18 x 4.53 inches |
| Power Supply Design | Non-Modular |
| Item dimensions L x W x H | 8.46 x 1.18 x 4.53 inches |
| Is Discontinued By Manufacturer | No |
| ASIN : | B013ETVO12 |
| Manufacturer : | MEAN WELL |
| Item model number : | LRS-350-24 |
| Product Dimensions : | 8.46 x 1.18 x 4.53 inches; 1.64 Pounds |
| Date First Available : | June 1, 2015 |
| Is Discontinued By Manufacturer : | No |
What Buyers Say
Buyers consistently report this power supply fixes voltage sag, slow bed heating, and light flickering caused by cheap stock units. The thermal cooling fan triggers the most complaints, sounding like a hair dryer when it abruptly kicks on during heavy loads. Because the unit uses bare AC screw terminals, users strongly advise printing a safety shroud before wiring it up. The electrical reliability makes it a staple upgrade for 3D printers and CNC machines despite the noise.
“Wired it up to my Ender 3 and the bed heats up twice as fast now, but good lord the fan sounds like a drone taking off in my office.”
Common Praise
- Heats up 3D printer beds significantly faster than generic stock power supplies
- Maintains a stable 24V output even when drawing near the 14.6A maximum
- The 30mm casing makes it incredibly easy to hide under printer frames or inside enclosures
- Eliminates the AC power draw clicking and room light flickering common with cheaper units
Common Complaints
- The 60mm cooling fan hits 34dB when the internal thermostat triggers it
- The 115V/230V selector switch is recessed and easy to miss during installation
- Exposed AC mains terminals are a shock hazard without aftermarket or 3D printed covers
- Mounting holes don't perfectly align with older power supply brackets, requiring custom adapters
Ownership Tips
- The fan only turns on during heavy loads (like heating a 3D printer bed), so it stays silent during low-draw tasks.
- You can easily dial in exactly 24.0V using a multimeter and the built-in adjustment pot to account for voltage drop over long wires.
- If you swap the fan for a Noctua, you must use a 12V fan, not a 24V one, as the internal fan header steps down the voltage.
- The aluminum casing acts as a giant heatsink, so mounting it flush against a metal frame improves passive cooling.
Frequently Asked Questions
Does this come with a power cord?
No. You have to supply your own AC cable and wire the Live, Neutral, and Ground directly to the screw terminals.
Why is my power supply randomly shutting off or only outputting 12V?
Check the red voltage selector switch on the side. It ships set to 230V, so if you are on 120V mains, it will underperform and cycle off under load.
Is the cooling fan always on?
No, it is tied to an internal thermostat. It only kicks on when the internal components get hot, but when it does, it hits 34dB.
Can I adjust the output voltage?
Yes, there is a small potentiometer near the terminals that lets you tweak the output from 21.6V up to 28.8V.
Will this work as an upgrade for my Ender 3?
Yes, it is a direct 24V upgrade for the Ender 3 Pro and V2. You will need to print a mounting bracket and terminal cover first.
Can I replace the loud fan with a Noctua?
Yes, the stock fan is a 12V 60x60x15mm unit. You can swap it, but you will need to splice the wires or solder a new connector.
Buying Guide
When buying a bare power supply like this, you act as the electrician. There is no plug-and-play power cord; you must strip your own wires, crimp spade connectors, and screw them into the live AC terminals. You also need to verify your local wall voltage and manually set the red selector switch before ever plugging it in. If you are using this for a 3D printer or CNC machine, plan to print a terminal cover for safety.
350.4W / 14.6A Output
This is the total amount of power it can push. Think of voltage (24V) as water pressure and amps (14.6A) as the pipe size. If your LED strips or motors try to pull more than 14.6 amps, the supply will shut down to protect itself.
Switchable 115V/230V Input
Wall power varies by country. If you plug 120V into a unit set to 230V, it will starve for power and randomly shut off. If you plug 240V into a unit set to 115V, it will blow the internal fuse.
1U Low Profile (30mm)
1U is a server rack measurement, but here it just means the metal box is very thin (about 1.2 inches). This makes it easy to mount flat against the bottom of a desk or behind a machine.
Alternatives
If you need a completely silent setup without modifying fans, search for a fanless 24V 350W power supply with conduction cooling. If your equipment runs on 12V instead of 24V, search for the 12V variant of this exact model.
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