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MasterBox Lite 3.1 mATX Case with DarkMirror Front Panel and External Customization options by Cooler Master

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  • DarkMirror front panel
  • Customizable trim colors (included in box)
  • Full black coating
  • Transparent side panel
  • Support for up to three 120mm fans & watercooling
  • Graphic card support up to 380mm

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  • Overview
  • Specifications
  • Warranty & Returns
  • Reviews

General information

MASTERBOX LITE 3.1

The Gateway to Stylish Gaming

Focused on good looks, customization and performance, the MasterBox Lite 3.1 mATX case is a great choice for your new little powerhouse. A sleek DarkMirror front panel and three custom trim colors (included in the box) offer a great first entry point for customization. Additionally, it comes with an edge to edge transparent acrylic side panel to show your internal components.

Inside the case you'll find ample room for mAXT/mini ITX motherboard, graphics card up to 380mm in length and CPU cooler up to 158mm high. It also feature bottom-mounted PSU design and adequate cable routing space behind motherboard. And with support for up to 3 cooling fans and a watercooling system, we ensure your performance will not suffer.

3D Printing

Freely Express Yourself

Cooler Master knows the community also has some awesome ideas, and the ability to express them in everything you make or do. So with that in mind, Cooler Master is set to release the 3D printing schematics of the top and bottom trim.

General information

Expanding the Possibilities

For All Your Components

Let your configuration stand out with an all-black background.

General information

For CPU Coolers

General information

For Graphics Cards

General information

DarkMirror Front Panel

Because Your Case Doesn’t Have to Be Boring

A sleek, tinted side window panel and DarkMirror removable front panel allows for easy access to your components. And with support for up to three cooling fans and a watercooling system, Cooler Master ensures that your performance doesn't suffer.

General information


Learn more about the Cooler Master MCW-L3B3-KANN-01

Warranty, Returns, And Additional Information
  • Warranty
  • Limited Warranty period (parts): 1 year
  • Limited Warranty period (labor): 1 year
  • Read full details
  • Return Policies
  • We want to ensure your holiday shopping this year is hassle-free. That’s why we’re automatically extending our return policies on almost every product! For purchases placed between November 1, 2018 and December 24, 2018 you will have until January 31, 2019 to return your product. There's nothing additional that you have to do!
    • Return for refund until: January 31, 2019
    • Return for replacement until: January 31, 2019
  • This item is covered by Newegg.com's Extended Holiday Return Policy.
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Simplistic. Love this case!

Pros: Extremely simple case, with quality plastics and metal used throughout. Love the Airflow, too!

Cons: Only one included fan, so make sure you have a few extra fans handy when building with this case.

Other Thoughts: Cooler Master doesn’t disappoint!

1 out of 1 people found this review helpful. Did you?
4/ 5
good but bad airflow

Pros: This case looks great with RGB fans and is a perfect case for any first time builder

Cons: Airflow is pretty bad

Other Thoughts: Good case for the price but maybe spend a little more for one with better airflow

1 out of 2 people found this review helpful. Did you?
2/ 5
Aesthetically Pleasing, Practically Pathetic

Pros: Nice aesthetics
RGB Fans
PSU shroud
Relatively competent cable management solution
Multiple points offered to mount 2.5" drive via proprietary mounting tray

Cons: Incredibly restricted airflow
No top panel fan/radiator mounts
Awkward 3.5" drive cage placement which can interfere with PSU and cable management
Only 1 proprietary 2.5" tray included in the box

Other Thoughts: Copied from my review from PCPP: "By far one of the most disappointing chassis that I've ever worked with. First and foremost, the airflow is incredibly poor with my idles hovering around 45°C on both my CPU and GPU. My CPU (i5-8400) is on an AIO so there should be no reason why it should be idling so hot other than poor airflow. My GPU is an air cooled Zotac GTX 1060 6GB. I removed the mostly aesthetic plastic front panel and I dropped my idles by nearly 20°C. This is, in my honest opinion, a grave oversight in Cooler Master's R&D dept. and while it's not exactly lethal to a rig, it's definitely not helping in providing optimal performance for a rig of any caliber. Now, moving to what's under the hood. The shroud is a nice touch and it has several points to run cables through, it's not one solid piece. However, this also presents a problem and that is very little wiggle room for PSUs. This problem is exacerbated by the 3.5" drive cage placed directly next to where the PSU goes so if you've got a larger PSU you may have some issues running cables from the unit. This problem is compounded if you're like me who doesn't solely rely on solid state for your storage needs. Speaking of storage, the case comes with a little tray used to mount 2.5" drives in the case. There are several points where this tray could be mounted but you are only provided with one. At the time of me building my rig, spare trays were not available for purchase from Cooler Master's website. I do not know if this is still the case, I would honestly hope not. Overall I cannot recommend this chassis due to the glaring airflow issues and the poor storage expandability. You're better off going with almost anything else."

0 out of 4 people found this review helpful. Did you?
Ownership: 1 day to 1 week
Verified Owner
3/ 5
Very small

Pros: - The only good looking mATX case besides the inwins which cost twice as much.
- The best looking case at the price point.
- Acrylic side panel reduces the weight and makes the case easier to wield.

Cons: - Extremely small, there is barely enough space for just the 24 pin cable. I still have the gpu, an extra fan, and led lights to put in. That means 2 more pcie cables, a SATA, and a weird molex thing for the fan and I'm having trouble closing the case now. Sometimes wires touch the mobo when u close it so it shorts out and wont turn on.

Other Thoughts: I recommend only if u are upto the task of extreme cable management. I do not recommend this for novice builders. In fact, I recommend u put in a little more money and get an ATX mid-tower that actually has some room for wires.

1 out of 4 people found this review helpful. Did you?
Ownership: 1 month to 1 year
Verified Owner
3/ 5
Good looks but with caveats

Pros: - Good looks, mirrored front paired with led fans is a must.
- Fairly easy to build in.
- Decent cable management.

Cons: There's really no nice way of saying this but the airflow is just really atrocious. Even with 2 corsair AF120 High air flow fans up front set to run at max speed, the gtx 1080 in the build would nearly hit 100C (212F) while running the superposition benckmark. I was worried that the side panel was going to melt or warp.

Other Thoughts: Built two identical systems in this case with the following specs:

- MSI B350M Mortar
- AMD Ryzen 5 1600
- G. Skill Ripjaws V (2x8GB 2666Mhz)
- WD Black NVME SSD 512Gb
- EVGA GTX 1080 FTW2 ICX
- Corsair CX-M 550W PSU

1 out of 2 people found this review helpful. Did you?
Ownership: 1 week to 1 month
Verified Owner
5/ 5
Nice budget case

Pros: Cheap
Nice quality
Looks great!

Cons: you have to be careful not to scratch the plastics

Other Thoughts: Make sure you mount the front fans INSIDE the case, not outside between the metal and the front cover. Airflow is best this way, I don't have a problem with a lack of airflow with this case in that configuration. If anything you get good pressure and the rear fan spins a little faster in result. Great exhaust

Did you find this review helpful?
Ownership: 1 month to 1 year
Verified Owner
3/ 5
nice little case

Pros: small and simple, they give ya a extra led which is nice.

Cons: the side panel sint tempered glass. And I didn't receive my rebate. bought it last years 2017, still waiting.

1 out of 1 people found this review helpful. Did you?
Manufacturer Response:
Hello Anon,

Very sorry for the troubles you've encountered with your rebate, and would like to assist in correcting the issue. A 3rd party organization handles our rebates. They can be contacted here status-now.com or 1-800-953-3098.
Phone: 888-624-5099
Web: http://bit.do/CMsupport

Regards,
CM Customer Care
Mychal
Ownership: 1 week to 1 month
Verified Owner
4/ 5
Decent

Pros: I don't ever have cooling issues , most my components stay below 60 c

Cons: cable management was ass

Other Thoughts: I'll put more into this

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