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Cooler Master MasterBox Q300L Micro-ATX Tower with Magnetic Design Dust Filter, Transparent Acrylic Side Panel, Adjustable I/O & Fully Ventilated Airflow, Black (MCB-Q300L-KANN-S00)

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13,195 ratings

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Color: Black

Style: Micro-ATX MB

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Brand	Cooler Master
Color	Black
Material	STEEL, PLASTIC
Hard Disk Form Factor	3.5 Inches
Cooling Method	Air
Motherboard Compatability	Micro-ATX and Mini-ITX
Power Supply Mounting Type	Bottom Mount
Item Weight	480 Grams
Item Dimensions LxWxH	15.39 x 9.06 x 15 inches
Case Type	Mini-Tower

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I/O panel can be adjusted in 6 different locations and the Case can be positioned: Vertical or horizontal
Edge to edge acrylic transparent side panel offers a full view inside
Body depth height: Can support normal size ATX power supply
Front magnetic design dust filter with open perforated front, top and bottom for high air performance
Extra space behind the motherboard tray for hidden cable management
Motherboard Support: Micro ATX, Mini ITX, CPU Cooler: 159mm/6.2", GPU 360mm, Radiator Support Front: 120mm/240mm, Rear: 120mm

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Customer Rating	(13195)	(251)	(4023)	(201)	(3734)	(4593)
Price	$69.99	$69.99	$54.99	$65.99	$69.99	$74.99
Sold By	Amazon.com	Antec Prime	Super Component Store	MOROVOL	Amazon.com	Amazon.com
Item Dimensions	15.39 x 9.06 x 15 inches	13.82 x 7.87 x 15.35 inches	15.35 x 8.07 x 14.96 inches	13.78 x 7.87 x 15.23 inches	16.7 x 12.6 x 13.25 inches	17.15 x 8.56 x 16.14 inches
Item Weight	1.06 lbs	7.72 lbs	10.21 lbs	9.00 lbs	4.41 lbs	13.89 lbs
Model Year	2017	—	—	—	2014	—

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Product Description

The Master Box Q300L is your straightforward option in the lineup of the brand new Master Box Series from Cooler Master. A Series that might be small in size but excels in functionality and modularity without compromising on the thermal performance. Although the size wouldn't tell, the Master Box Q300L supports a standard ATX PSU which we don't see often in the market with this size. Based on the different system setup, the I/O panel can be adjusted to six different locations, three options at each side of the case. You can decide which setup fits your system best. Due to the cube design of the frame and special pattern design on the magnetic dust filter will make the chassis stand out from the rest. The combination of a practical design and the unique customizable outlook makes the Master Box Q300L The perfect choice for office and home.

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Technical Details

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Other Technical Details

Brand

‎Cooler Master

Item model number

‎MCB-Q300L-KANN-S00

Item Weight

‎1.06 pounds

Product Dimensions

‎15.39 x 9.06 x 15 inches

Item Dimensions LxWxH

‎15.39 x 9.06 x 15 inches

Color

‎Black

Batteries

‎1 Unknown batteries required.

Manufacturer

‎Coolermaster

ASIN

‎B0785GRMPG

Country of Origin

‎China

Is Discontinued By Manufacturer

‎No

Date First Available

‎March 1, 2018

Additional Information

Customer Reviews

13,195 ratings

4.5 out of 5 stars

Best Sellers Rank

#4 in Computer Cases

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.

If you'd like a copy of the manufacturer's warranty for a product found on Amazon.com, you can contact the manufacturer directly or visit their website for more information. Manufacturer's warranties may not apply in all cases, depending on factors like the use of the product, where the product was purchased, or who you purchased the product from. Please review the warranty carefully, and contact the manufacturer if you have any questions.

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1 computer case

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From the manufacturer

Make It Yours.

We're all about the things that make building a PC such a rewarding experience. The sense of achievement. The joy of making and creating something uniquely yours in form and function and, of course, the thrill of bringing your creation to life without melting your components.

MasterBox Q300L

Choose Your Style

The MasterBox Q300L is your straightforward option in the MasterBox Q-series from Cooler Master, a series that might be small in size but excels in functionality, modularity, and thermal performance. The combination of a practical design and the unique customizable aesthetic makes the Q300L the perfect choice for office and home use.

Magnetic Dust Filters
6-Orientation I/O Panel
Edge-to-Edge Acrylic Side Panel
Routing Space
Thermal Performance
ATX PSU Support
CPU Cooler: 159mm, GPU 360mm, Radiator Support Front: 120mm/240mm, Rear: 120mm
Motherboard Support: Micro-ATX, Mini-ITX


Versatile Cooling Versatile mounting options on Top, Bottom and Rear. Fit up to 240mm Liquid Cooler to stay ahead of the game.	Components Clearance Supports CPU coolers up to a height of 159mm, graphics cards up to a length of 360mm, and power supplies up to a length of 160mm.	Roomy Interior Support for Micro-ATX or Mini-IT length motherboards for upgrades to stay ahead of the game.	Open Thermal Design The open design of the perforated front, top and bottom assures excellent thermal airflow.

5 star		70%
4 star		17%
3 star		7%
2 star		2%
1 star		4%

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Joey Bee

Better than you'd think

Reviewed in the United States on September 11, 2022

Color: Q500LStyle: ATX MBVerified Purchase

I was worried at first after reading some of the low star reviews, understanding ordering anything online is a bit of a gamble. BUT, I was one of the lucky ones, This case is amazing! Yes it is THIGHT, that's to be expected, so I tore out the guts from my REDUX pre-built that was Way too large. And it came together without compromising performance. A lot of the bad reviews were about insufficient thermals, considering the case is extremely modular, it's fairly easy to achieve proper airflow if you are creative enough the fan placement, it may have been a different story if I was air cooling rather than water, but my large 240mm radiator fits just fine. Having cool air come from the bottom and front, and exhaust hot out the top and back, my thermals are holding strong. The dust filters are a great addition for aesthetic and functionality. But if you have a 2 or even 3 fan GPU you may struggle to fit it. Overall I'm giving it 5 stars because as a experienced PC builder it was at most a 5/10 for difficulty and a 10/10 for style. Material is sturdy and well put together. And noise is all about fans and airflow so weigh your options there.

One person found this helpful

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AdamL.

Don't let the size fool you. This is the most pleasant case I've ever built in.

Reviewed in the United States on August 13, 2022

Color: Q500LStyle: ATX MBVerified Purchase

I bought this case because it's relatively small and supports full sized ATX motherboards. Despite the size, this case is actually more pleasant to build in than most full sized cases. The bottom line is that Cooler Master did a fantastic job designing this case. Every step of the build process has been considered and it results in a friction-free experience. In fact, the size optimized power supply layout makes the power connections far easier to plug in than standard cases! The fit and finish is also really good. There are no idiotic brackets scratching you as you bend over trying to plug in a cable. There are no sharp corners to give you cuts. The IO panel can be removed during building and replaced after you find extra space in the case and have it plugged in properly. There are cable cutouts everywhere you need them, and some places where you never knew you needed them! The only significant limitation I notice is that fitting a radiator in this case may be frustrating or nearly impossible. However, don't let that stop you. This case can fit very large CPU and GPU parts inside it which is really shocking considering the size. I got rid of my Phanteks and I won't miss it. This is designed so much better. Cooler Master really hit a home run with this case layout and I hope they continue to make more cases with this compact design which is actually superior to a standard ATX mid tower.

I do suggest you invest in an intake fan for the front to maximize airflow.

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Scott

Case could be improved in some aspects

Reviewed in the United States on September 14, 2022

Color: Q500LStyle: ATX MBVerified Purchase

The cable management of the system could be improved, and the psu holster is bare bones as possible. There is a LOT of autonomy in positioning of almost everything other than the mother board and it’s components, so if you don’t like self-direction on psu and fan placement, then this case probably isn’t for you. I needed a compact space for the PC because its going into an RV, otherwise I likely would not get a case like this one. I’m not a huge fan of the way the SSDs/HHDs are equipped in this system. It works, but could have been better implemented. A lot of shortcuts were taken with this case. However, it is a very budget case, so you get what you pay for, and in that respect, you get a little more. So, price to quality is a positive here despite my criticisms.

Helpful

Nice little case for big motherboards and GPUs

Reviewed in the United States on September 6, 2022

Color: Q500LStyle: ATX MBVerified Purchase

This case works well even for full-sized motherboads and GPUs. Upgraded it with 4 RGB fans: one front, one back, two on top, put Gigabyte X570 Aorus Ultra with MSI NVidia RTX 3080 ti, AMD Ryzen 7 5800X. Even with a huge Noctua fan - everything fits and the build looks decent. Airflow with extra fans is superb. The system runs cool, quiet and smooth, no thermal throttling. Front and top are basically all open surface covered by magnetic air filters. Nice aesthetically pleasing case. Would recommend highly to anyone, but consider installing extra fans. I think just one fan coming with it would've not been exactly enough.

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Faaa

Amazing Case For an Amazing Price! (Model: Q300L)

Reviewed in the United States on June 25, 2020

Color: BlackStyle: Micro-ATX MBVerified Purchase

So first I'd like to state that this review is specifically for the Q300L model. Amazon does this annoying thing where they mix all the reviews of all the models together and I can't stand it so I'm just stating the model flat out.

I just built my 10 year old nephew’s PC using this case and I have to say that I was very surprised at how much I loved building in this case. Originally I bought the Compucase HEC HX300 case for 30$ from Newegg and I was just frustrated at the lack of air flow from that case. It only had room for one fan which was the back exhaust and that's it. It didn't even have holes for the power supply's intake fan! It was my fault for not researching enough and buying something so cheap. Then I did a little research and came across this case. It is only 50$ but has everything I want. I've seen PC builders on youtube build with this case and they all had great things to say.

So the first thing I like about this case is obviously how much airflow it allows. It's an interesting design because there are holes all over the top, all over the bottom, and all over the front and you can install 4 fans if you wanted to (2 up top, 2 in front, 2 in bottom) in addition to the included exhaust fan at the back making it support up to 5 fans! Now with all those holes you might be thinking this is going to be an ugly case but as you'll see in the pictures this is not the case (pun intended) and it has very sleek looking dust filters to cover the top, front, and it’s not obvious from the picture but it has a filter on the bottom as well. I was pleasantly surprised to see that the filter is magnetic which made removing them to install my fans a breeze (pun intended). I also imagine cleaning them when they get dirty will also be very simple. You can simple remove them and just rinse with water. One tip when installing fans is that since there’s air holes all over, they actually made a very small indentation around the holes that you should screw in your fans. These “guides” are hard to notice but if you look closely you’ll see them. They have space for 140mm and 120mm fans depending on whatever you want. Air is able to easily flow through the filter so my air flow issues were resolved!

The case also looks very nice in my opinion. I have the black model just because that’s what my nephew wanted but in review videos I’ve seen, the white one looks very nice as well. Cable management at the back is pretty good too and the case comes with a lot of zip ties. The filters I mention above are also very aesthetically pleasing. The power button, 2 USB ports, headphone jack, and speaker jack are on the side which I don’t mind. The interesting thing is that this IO panel can be unscrewed and moved to the other side which is nice. The clear side panel is acrylic but it’s a 50$ case so it’s fine. It doesn’t look bad at all. There’s also room in the cable management area for a 3.5” hard drive and 2 SSD’s inside the main area which is very good.

Overall the case was pretty simple to build in. It’s designed very well to maximize airflow while looking great. I think this is an excellent case especially for the price. If you’re in the market for a cheap but good PC case, then you my friends have stumbled on a cheap but GREAT PC case. I would highly recommend this case and am willing to do even more expensive builds with this case in the future.

One final note I’ll add, I built my nephew’s pc with a Ryzen 5 1600 processor and RX 480 gpu reference model targeting 1080p gaming and the heat in my old case with that one exhaust fan was reaching around 87 degrees C. After I added two intake fans in the front and one exhaust fan in the top along with the back exhaust fan that comes with this case my temperatures went down into the mid 70’s while gaming which is great. If you want looks as well as functionality for a great price, go with this case.

One person found this helpful

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Jim

✔ Awesome Little Case! (with a Few Small Flaws)

Reviewed in the United Kingdom on October 3, 2018

Color: BlackStyle: Micro-ATX MBVerified Purchase

Having had a larger PC case for a while I thought it was time to move to a smaller option. I liked the look of the BitFenix cases but at around the £50 mark, the CoolerMaster Q300L was just what I was looking for price and design-wise.

Being able to choose where the USB and power buttons are placed is a cool idea but if you want to use it at the top (like in my setup - Pic above) you will need a USB extension to run the cable down the back of the case.

There's plenty of room for cable management and the build quality is good. I have a full sized HDD at the back and there's also space for two SSD's.

Having all the holes means that you don't get much airflow pressure but I haven't had any heat issues with my overclocked AMD 1700X. If you're looking at having your PC on the floor, I woudn't choose this case as it'll most likely be full of dust in a few months. For desktop, I've had it running 4 months with minimal dust although you can see a slight dust ring around the front intake fan.

When setting up be careful with any fluff and this will easily get stuck into magnet dust filter mesh.

If you do decide to buy the CoolerMaster Q300L, you'll also need to invest in some fans as it only comes with one medium-volume fan. LED fans looks great and I've added three plus used the included fan as a front-intake.

Pros
✔ Cool Design
✔ Build Quality + Cable Management
✔ Removable Magnet Dust Filters
✔ Compact Size

Cons
- Only One Fan Included
- Perspex Window Tint Is Very Dark
- USB Cables a little short

I also upgraded the CPU fan to a Arctic Freezer 7 Pro and there's plenty of horizontal room left. If you're going for a big CPU cooler, you might have to watch out with the clearance.

Cheers,
Jim!

45 people found this helpful

Greg (SIPAK)

Nice looking case, but with a STUPID location of 3.5" HD mount.

Reviewed in the United Kingdom on April 4, 2019

Color: BlackStyle: Micro-ATX MBVerified Purchase

Before I get to my main criticism of this case, I will list the positives:
1) Very clever magnetic dust filters which double up as aesthetically attractive (but still understated) covers of the front and top.
2) Beautiful smoked side window, made from polycarbonate (not glass).
3) Clever option of having the case stand vertically or flat, as it has rubber screw feet on the non-windowed side panel.
4) Tons of room behind the motherboard panel for cable management, making for a very tidy build indeed.

Now the negatives (1 big one really):
1) The location of the HD mount is behind the motherboard panel. This is an area that is TOTALLY unventilated, and so the HD gets very hot here. The bracket itself is clever, which is a plate that is screwed to the HD and then this plate clips (and secured by a thumb screw) into its mount.

Because of the excessive heat build-up of the HD (obviously not helped by ZERO air-flow and heat from the back of the CPU), I decided to mount my 3.5" 2TB hybrid drive elsewhere. There's a few alternative locations for 2.5" drives, but not my bigger 3.5" HD. I re-used a mounting bracket from an old build and mounted it on the case's floor panel in front of the PSU. It stays MUCH cooler there.

Overall the result is good. But I cannot fathom the hideous design choice of mounting the 3.5" HD behind the motherboard where it will bake. If you're only using 2.5" SSD/HDs then you will be fine.

25 people found this helpful

AddzSapphire

First build went well.

Reviewed in the United Kingdom on October 9, 2019

Color: BlackStyle: Micro-ATX MBVerified Purchase

Probably not the best idea ever to do a tight mATX build as my first PC build but overall went well.

Word of advise be careful with the power panel, I didn't realise the panel had 4 screws holding it in the case (thought it was just the 2) and removed the top plate as it came off easily only to find that it would not go back on the same again and the power button was held on by this plate (rewired my case so that the reset button is now the power button, and positioned the power button for show).

Case has managed to somehow swallow 2070 super gaming X trio but this was a very tricky install (this was why the power panel had to be removed).

Cooler master ml120r argb cooler fit well too but getting the pipes in the correct position was also tricky.

I have 2 mf140r as intake at the front and the original 120 fan from the case positioned at the top as exhaust near the RAM. So case is very adaptable and nothing is running too hot.

Lots of room in the back for cables, do not have any HDD/sata SSD (only m.2) installed though so can't comment on cable space when these are taking up space. But do have the RGB controller from the ml120r back there running all the RGB fans. Some cables can be fiddly to run (especially the CPU power cable connecting to a MSI b450m mortar max).

Overall pleased with this case, looks good and functions well.

9 people found this helpful

Cliente Amazon

Gabinete simples, customizável. Uma ótima opção.

Reviewed in Brazil on September 26, 2020

Color: BlackStyle: Micro-ATX MBVerified Purchase

Gabinete pequeno e adaptável na maioria dos lugares. Recomendo para quem tem pouco espaço no móvel ou quer montar um desktop discreto.

33 people found this helpful

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Neil

Decent case, but let down by awful support for 3.5" drives..

Reviewed in the United Kingdom on December 7, 2019

Color: BlackStyle: Micro-ATX MBVerified Purchase

Right.. If you're just going to stick SSD's in this case, then great.. Room for 2 or 3 of them.
However, if you want to put a load of 3.5" drives into it, but still want a small-ish case, then beware..
I wanted this case to replace a much smaller case I use as a NAS. I wanted something with a bit more room and something a bit easier to keep cool.. It's got up to 6 drives (5 of them 3.5")..
Aside from the awful mount point for the single 3.5" drive**, there is NOTHING to allow you to natively add a load of 3.5" disks. So I had to create my own little HDD rack using white 30mm plastic angle sections.. I've managed to stack 5 of them on top of each other, with 1cm between each, and sit this 'enclosure' behind the front fan..
A total pain in the behind, but it works....
If this case were 1cm wider and 1cm longer, it would be perfect..

**even the single 3.5" mount point is unsuitable as there is NO ventilation at this position..

4 people found this helpful

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Cooler Master MasterBox Q300L Micro-ATX Tower with Magnetic Design Dust Filter, Transparent Acrylic Side Panel, Adjustable I/O & Fully Ventilated Airflow, Black (MCB-Q300L-KANN-S00)

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What's in the box

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From the manufacturer

Make It Yours.

MasterBox Q300L

Choose Your Style

Versatile Cooling

Components Clearance

Roomy Interior

Open Thermal Design

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