Cooler Master MasterBox Q300L Computer Case ‘Magnetic Patterned Dust Filters, mini tower, Alloy Steel, Modular I/O Panel, Window Side Panel’ MCB-Q300L-KANN-S00, Black

£71.71

Added to wishlistRemoved from wishlist 0
Add to compare


Price: £71.71
(as of Jun 05, 2025 08:38:22 UTC – Details)

From the brand

Cooler Master brand banner featuring a PC, a keyboard and a mouseCooler Master brand banner featuring a PC, a keyboard and a mouse

Building a PC is a highly personalized journey. Our components represent so many different personalities because PC enthusiasts don’t fit into just one mold. It doesn’t matter if you’re a student on a tight budget, a graphic designer that’s brand new to building, or a veteran modder of high-end gaming PCs; we offer components to inspire creative freedom in everyone.

MasterLiquid Core II 360MasterLiquid Core II 360

Air & Liquid Cooling Solutions

MasterBox 600MasterBox 600

SFF to Full-Tower PC Cases

V850 SFX Gold ATX 3.1V850 SFX Gold ATX 3.1

ATX & SFX PSU

MM712 RGBMM712 RGB

Wired & Wireless Gaming Gear

GPU Holder Kit V3GPU Holder Kit V3

Storage & Desktop Accessories

Is discontinued by manufacturer ‏ : ‎ No
Product Dimensions ‏ : ‎ 39.08 x 23 x 38.1 cm; 480 g
Date First Available ‏ : ‎ 3 Dec. 2017
Manufacturer ‏ : ‎ Cooler Master Europe B.V.
ASIN ‏ : ‎ B0785GRMPG
Item model number ‏ : ‎ MCB-Q300L-KANN-S00
Guaranteed software updates until ‏ : ‎ unknown

PATTERNED MAGNETIC DUST FILTERS – The custom-designed front and top magnetic dust filters are completely removeable and present a sophisticated, yet cunningly minimalist, functional chassis facade.
VERTICAL OR HORIZONTAL- The MasterBox case features rubberized thumbscrews that enable either a standing or laying orientation with fully-perforated panels for multiple airflow configurations.
MULTIPLE COOLING OPTIONS – The front panel can support up to two 140mm fans or a 240mm liquid cooler radiator. The rear panel supports a 120mm cooling module (fan or radiator), while the top can house two 120mm fans.
EDGE-TO-EDGE DISPLAY – The square edge-to-edge transparent side panel enables a full display of any system build, and includes an I/O panel which can be rotated into 3 different orientations on either side. Behind the motherboard tray is 28mm of allocated space for clean cable management.
SPACIOUS INTERIOR – The MasterBox Q300L supports CPU coolers up to a height of 159mm, graphics cards (GFX) up to a length of 360mm, and power supplies (PSU) up to 160mm in length.

Customers say

Customers find the computer case well-built and appreciate its industrial black look. They consider it excellent value for money and praise its compact design that accommodates large graphics cards. The case is easy to build in, with plenty of space for cable management and room for big GPUs. While some customers report good airflow, others mention very little airflow.

12 reviews for Cooler Master MasterBox Q300L Computer Case ‘Magnetic Patterned Dust Filters, mini tower, Alloy Steel, Modular I/O Panel, Window Side Panel’ MCB-Q300L-KANN-S00, Black

0.0 out of 5
0
0
0
0
0
Write a review
Show all Most Helpful Highest Rating Lowest Rating
  1. Thomas Harris

    Mastic cooler case
    This case is really good. I use PC part picker and I highly recommend it for beginners but this case is very cheap if you can’t afford a very expensive case and I had no issues I’m using it my pre-build as a home server to store all my stuff and so far it’s been fine with temperature. What’s good about this case? It’s very small and compact and easy and it’s not that heavy and the filters are easy to change.

    Helpful(0) Unhelpful(0)You have already voted this
  2. Jim

    ✔ Awesome Little Case! (with a Few Small Flaws)
    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 SizeCons- Only One Fan Included- Perspex Window Tint Is Very Dark- USB Cables a little shortI 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!

    Helpful(0) Unhelpful(0)You have already voted this
  3. Gk

    Great for uatx but warps easily
    Great design, good airflow, magnetic filters at front top and a removable filter with elastic pins on bottom. Plenty of space inside for 5 fans (I’m using an RX580, would fit a bigger GPU edit: changed to a RX 6800XT had to do some maneuvers to get it in but still fits) and for cable management. But the chassis build quality could be a bit better, got a lot of warping while screwing the fans and where the motherboard sits is a bit uneven, not a deal breaker for me as it was a recreational build. Overall very good looking and great price.

    Helpful(0) Unhelpful(0)You have already voted this
  4. Vendic97

    BEST COMPACT CASE
    I was looking for something small for an ATX (later upgraded to MATX) motherboard board. Came across this pc case, its compact, unique and universal! What do I mean by that?The case can be placed almost any way! All the feet and the front panel can be rotated allowing case to be placed anyway! Even on its back as the back panel screws are also feet!Lots of YouTube videos I found before buying said thermals are really bad in this case, which has put me off but the size and the price were too good to pass up on. Using this pc case for almost 2 years, I haven’t come across any thermal issues. I have stock AMD Wraith prism for CPU and GPU is also stock cooling. I do have 4 fans on the case 2 intake and 2 exhausts, thermals are around 60° when under load.It was a bit of a challenge putting everything in as my psu wasn’t modular so more cables to hide, but the back side of pc has a lot of clearance allowing easier “tucking” in of cables.PS. Thought the back plate was too boring so I did a stickerboom on it and not regretting it ever so slightly!

    Helpful(0) Unhelpful(0)You have already voted this
  5. marcus adburgham

    Stylish and easy to assemble
    I had absolutely no problems with this case building a PC from scratch. I like the magnetic dust filters which can be peeled off according to taste, and the industrial black look, it’s better than I was expecting. It has a tinted perspex side, which looks nifty when the computer is switched on. I accidentally removed too many of the rear blanking plates, which are lightly spot welded into place, so cannot be put back once removed. Just something to be aware of.

    Helpful(0) Unhelpful(0)You have already voted this
  6. Amornyos Horprasert

    Good Value Case (Amazon Resale)
    The case came in good shape. Seem new

    Helpful(0) Unhelpful(0)You have already voted this
  7. WildlifeTog

    Case easy to work with, spacious and looks great. A+ to seller for quickly solving a minor problem
    I used this for my first ever PC build; I am a wildlife photographer starting to venture into the world of wildlife videography; I built this PC for 4k video editing as my 4 year old laptop with an i7 processor and integrated GPU just wasn’t up to the job, very frustrating to use. Spec for this build:- Asus Tuf B550M motherboard- AMD Ryzen 3600 CPU- Phoenix GEFORCE GTX 1660 super GPU- Corsair RM550x PSU- Western 500gb M.2 NVME primary drive- Seagate Barracuda 4gb storage drive- x3 Antec RGB cooling fans- BenQ 27 inch 4k monitorI have used Windows 10 home OS. All worked a treat and is absolutely rapid, handles the 4k editing and multiple large photoshop RAW files with ease. The case provided ample room for the above build with all cables neatly tidied away. I have space for a third 2.5 inch HDD/SSD should I require it in the future. Case looks great with the full open glass front displaying the build and RGB lighting.I don’t often write reviews, however the seller was wonderful. The case originally came with one of the rubber feet missing. Not a huge issue, but all the same I wanted it to be right. I contacted the seller and within 3 days I had a replacement rubber foot in my postbox. Great service and all around a happy customer.

    Helpful(0) Unhelpful(0)You have already voted this
  8. Lincoln de Macêdo

    o aproveitamento de espaço tem um motivo claro: HD e SSDs ficam por trás da placa mãe pendurados, é uma boa saída mas quem tem vários SSDs e/ou HDs num servidor doméstico este gabinete pode não ser interessante mesmo tendo um fluxo de ar tão bom, este fluxo não vai para onde os SSDs e/ou HD ficam.o cabeamento nele é ótimo, a placa lateral transparente quando as luzes de placa mãe e outros componentes estão desligadas deixa o gabinete super discreto (prefiro bem mais assim)

    Helpful(0) Unhelpful(0)You have already voted this
  9. Didwaf

    Attention aucune baie extérieure pour lecteur graveur ou accessoire lecteur de cartes intégré.Place pour un seul hdd 3.5 et pour 2 ssd 2.5.Possibilités d’usage en vertical ou horizontal avec tableau de bord déplaçable sur les 4 côtés.Filtres anti poussière aimantés.

    Helpful(0) Unhelpful(0)You have already voted this
  10. Praf3l

    So this q300l case was released by cooler master in 2018This Case was q500l 2019-2020 predecessorThis case has holes in top, front and bottomI had 5 fan laptop cooler on which this Case is sitting right now, my laptop had fan issues so now it’s used for PC case coolingI have attached 2 arctic fans 140mm 1600rpm and 120mm ,1200rpm in front for intake2 coolermaster fans one for exhaust (xtraflow 1500rpm) backcand one for top ( 200-1000 rpm)1 circle fan (1000-1200) rpmMy PC temp with just one exhaust fan was around 45-55 during normal usage and CPU temp was around 64-74 degrees on normal to heavy load and gpu temps were 50 – 60 degreesCPU fan was spinning at 1500 rpm maxAfter bumping up AMD wraith Cooler fan to max fan speed of 2600 rpm in bios settings, my CPU temps went down to 50 degrees.After installing all the fans,My case temps are 36-39 degreesMy CPU temp is at 42 degrees normal and at 57 on load.If your buying this case get at least 2-4 fansYou can 140mm fans or radiator in the front onlyOn top only 120mm can be attached properlyI could be wrong depends on brand and size of 140mm fanMy arctic fan screw holes weren’t able to match on top of the case.The magnetic dust filter on top and front can be cleaned easily.The side panel is acrylic, fingerprint magnet.2 USB 3.0 jacks in frontMic and headphones Jack with HD audio but can only do 5.1 channel not 7.1.I had to attach my 7.1 channel headphone in the backCable management very goodLot of spaces in the back.If you have radiator then your CPU temps will get better than mine .This case should cost around 3500 rupeesBut I had no choice but pay up 4500 rupeesCuz it I needed it urgently.This pandemic has really screwed PC enthusiast when it comes to pricing of PC components.4/5My PC specsAMD 1300X 3.8ghz (2018)Sapphire pulse RX580 8gb OC lite (2020) 😑Ballistix red 16gb (2020)😑Cooler master 550 mwe psu (2018)Acer vgo monitor 144hzLG monitor 75hz

    Helpful(0) Unhelpful(0)You have already voted this
  11. Evgeny Degtyarev

    Schönstes Gehäuse, dass ich je hatte. Und es passt sogar ein “normaler PC” mit Standard Mainboard Größe problemlos rein.Habe extra das kleinstmögliche Gehäuse gesucht, nachdem mein PC bisher in einem lange tower drin war. Alles hat perfekt rein gepasst. An der Temperatur hat sich nichts verändert, ist ehrlich gesagt sogar besser belüftet und minimal kühler. Das DVD Laufwerk musste geopfert werden, braucht aber auch niemand mehr bzw. man kann ja auch das alte mit Adapter per USB verbinden.11/10

    Helpful(0) Unhelpful(0)You have already voted this
  12. Daniël

    Goede kast met aardig wat mogelijkheden! Had zelf een kast nodig die niet te veel ruimte innam en niet al te duur was. Ik ben positief verrast.

    Helpful(0) Unhelpful(0)You have already voted this

    Add a review

    Your email address will not be published. Required fields are marked *

    Cooler Master MasterBox Q300L Computer Case ‘Magnetic Patterned Dust Filters, mini tower, Alloy Steel, Modular I/O Panel, Window Side Panel’ MCB-Q300L-KANN-S00, Black
    Cooler Master MasterBox Q300L Computer Case ‘Magnetic Patterned Dust Filters, mini tower, Alloy Steel, Modular I/O Panel, Window Side Panel’ MCB-Q300L-KANN-S00, Black

    £71.71

    buysmarthq.com
    Logo
    Compare items
    • Total (0)
    Compare
    0
    Shopping cart