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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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)

4.4/5
Product ID: 59059637
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Details

  • Brand
    Cooler Master
  • Motherboard Compatability
    Micro-ATX and
  • Case Type
    Mini-Tower
  • Recommended Uses For Product
    Gaming
  • Color
    Black
  • Material
    Alloy Steel
🧲Magnetic dust filters for easy cleaning
❄️Optimized airflow with 5 fan slots + 240mm liquid cooler
🖥️Supports GPUs up to 360mm for powerful builds

Description

🖤 Build Bold, Stay Cool, and Stand Out.

  • OPEN THERMAL DESIGN - Perforated panels on all sides ensure your components stay cool under pressure.
  • MAGNETIC DUST FILTERS - Effortless maintenance meets sleek design—keep your rig pristine without the hassle.
  • SPACIOUS MICRO ATX INTERIOR - Room to grow with support for large GPUs, tall coolers, and future upgrades.
  • ADJUSTABLE MODULAR I O PANEL - Customize your setup with flexible I/O placement for ultimate desk ergonomics.
  • TRANSPARENT ACRYLIC SIDE PANEL - Show off your build like a pro—edge-to-edge clarity that demands attention.

The Cooler Master MasterBox Q300L is a versatile Micro-ATX tower featuring magnetic dust filters, a fully ventilated open thermal design, and a transparent acrylic side panel. It supports large GPUs up to 360mm, CPU coolers up to 159mm, and offers flexible I/O positioning, making it perfect for professionals seeking a sleek, customizable, and high-performance PC case.

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Specifications

Wireless Type802.11a
Number of USB 3.0 Ports2
BrandCooler Master
SeriesQ300L
Item model numberMCB-Q300L-KANN-S00
Item Weight1.06 pounds
Product Dimensions15.39 x 9.06 x 15 inches
Item Dimensions LxWxH15.39 x 9.06 x 15 inches
ColorBlack
DepartmentComputer Cases
ManufacturerCooler Master
ASINB0785GRMPG
Is Discontinued By ManufacturerNo
Date First AvailableDecember 5, 2017

Have a Question? See What Others Asked

Is this case wide enough to support a cooler master hyper 212 evo?
I've seen photos of the handle (from a Q300P) being attached to the center of the top panel of this case. Is this possible?
what are the size and placements of the fans?
Does the case come pre-assembled?

Reviews

4.4

All from verified purchases

B**M

This is THE best case below $40

When I was picking my parts, I wanted to spend as little as possible on a case without going into the ultra budget rosewills and what not. Pretty much every case I was interested in was either in the $60 range or the $100+ range.I was going to settle on the thermaltake v21 and replace all the sides with windows, then I was going to settle on the fancy version of the q300l.I kept researching and researching and it sounds like cooler master fans aren't that great so getting two rgb ones with the fancy version sounded like a good deal but I had found plenty of cheap 6 packs of rgb fans and would prefer if all matched. This case at below $40 was just simply the most unique one at this price range and I had already decided on all the other parts (don't pick the case first) and tried imagining the build.I changed my mind on getting ring style fans, the perforated nature of this case would completely ruin the rings' lighting thru the walls, so the other option was fully lighted fans. Definitely the right choice in this one. You need to be careful with CPU coolers too, several popular ones are too tall by less than a mm. Just happens that the fans I got, uphere's (I took a chance and they are so good, don't let the brand scare you) also come on uphere's cooler and it fits PERFECT. No touching the side panel or anything.I didn't realize how black the case was as well and that is such a good thing. It is black, not grey.Cable management was as easy as can be with zip ties and fabric ties. Plenty of space to feed any cable heads thru any open route, I never got frustrated or had a problem making it look how I wanted.There's mixed info on the cooling performance. Lots of holes=lots of air. Gamers Nexus proved that false but I have yet to see temps over 75c during all benchmarks. Probably due to 9 fans.It just looks clean. I don't know if you can tell from the pictures.Cons: it's a cheap case so it's got more of a bare bones metal look than a sleek spaceship look. Not necessarily a bad thing.I really can't think of anything else, it was a complete joy to build in and everyone who's seen it really appreciates it. Would definitely recommend for budget builds and high end ones and is a perfect choice for custom builds built in quantity for offices and such at such a cheap price.Don't hesitate, if you think this case looks good even a little bit, it looks better in person and you shouldn't be disappointed.Make sure you are using micro atx motherboard. Just saying. Some people. Normal atx psu fits with a recessed bracket, thought it was weird but now I actually like it. It allows the power cable to bend at the edge of the case as opposed to sticking out and inch or so.Definitely a buy for those on a budget.

F**A

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

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.

Common Questions

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Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

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Excellent communication throughout the order process. Product is perfect.

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Sneha T.

Received my product in pristine condition. Great service overall.

1 month ago

Ali H.

Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

Cooler Master Masterbox Q300l Micro Atx Tower With Magnetic Design | Desertcart GERMANY