Scan code: LN86432 Manufacturer code: MCB-Q300L-KANN-S00

CoolerMaster MasterBox Q300L Windowed micro-ATX/ITX PC Gaming Case

Cooler Master MasterBox Q300L, Black, Mini Tower Computer Chassis, w/ Window, micro-ATX/Mini-ITX, 120mm Fan, USB 3.0

Thumbnail 1 : CoolerMaster MasterBox Q300L Windowed micro-ATX/ITX PC Gaming Case Thumbnail 2 : CoolerMaster MasterBox Q300L Windowed micro-ATX/ITX PC Gaming Case Thumbnail 3 : CoolerMaster MasterBox Q300L Windowed micro-ATX/ITX PC Gaming Case Thumbnail 4 : CoolerMaster MasterBox Q300L Windowed micro-ATX/ITX PC Gaming Case
Scan code: LN86432 Manufacturer code: MCB-Q300L-KANN-S00
£49.99Item due on 15 July 2024
Due 15th Jul
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  • SCANPROTECT Protect against installation damage for 28 days. More info

    ScanProtect is an enhanced warranty specifically designed and offered by Scan to reduce the risk of any mishap or damage to components during installation.

    Our aim with ScanProtect is to encourage our customers to upgrade or build their own PC confidently. For a small additional fee our customers are provided with complete peace of mind.

  • 48HR REPLACEMENT If you need to return this item, your replacement will be dispatched within 2 working days of your product arriving back at Scan. More info

Masterbox Q300L – Windowed Black Mini Tower Gaming PC Case

Cooler Master MasterBox Q300L Mini Tower Gaming PC Case

BUILD YOUR DREAM PC IN A COMPACT FORM The Masterbox Q300L is your straightforward option in the brand new lineup of MasterBox Q series from Cooler Master. This small micro-ATX/ITX gaming case excels in functionality and even supports a standard ATX PSU which is something not common with this size. This unique, cube-design system allows you to choose a setup that suits your play style best, with the I/O panel that can be adjusted to six different locations with three options at each side of the chassis. The Q300L comes in a smooth black finish with a distinctive pattern design on the magnetic dust filter, making your PC totally unique to the rest.

Relish in total Power with a Smaller Design

Cooler Master Micro-Atx Form Factor

SMALLER DIMENSIONS WITH ATX PSU SUPPORT The Q300L has a small Micro-ATX form factor, but despite the depth and height of only 370mm x 370mm, this adaptive case can accommodate a normal ATX PSU, delivering the highest performance out of a small machine.

Show off the Power behind your Rig

Cooler Master Q300L Masterbox Glass Side panel

EDGE-TO-EDGE ACRYLIC SIDE PANEL Display the superiority of your components with the crystal clear side panel that puts your build on show for everyone to see.

Future-Proof Customization

Cooler Master Q300L I/O panel

HIGH FLEXIBILITY FOR SYSTEM BUILDING The adaptive I/O panel can be adjusted to six different locations giving you complete control over the layout over your PC and allowing you to configure it however you want. On both sides of the body you can install the I/O panel at the front, top or bottom to best suit your components.

An Open Design for Optimal Cooling

Cooler Master Q300L Open Design Layout

HIGH COOLING, HIGH PERFORMANCE The Q300L comes with an open design with a perforated front, top and bottom to guarantee exceptional thermal performance to give you fantastic cooling during long gaming sessions.

Compact but Cool Design

Q300L Fan and Radiator Fittings & Sizes

EXTENSIVE FAN AND RADIATOR SUPPORT The Masterbox Q300L comes impresses once again with its ability to hold up to 6 fans on your rig. The front support up to two 140mm fans and up to a 240mm radiator, with the rear supporting a 120mm fan or radiator. The top additionally supports two 120mm fans. This small chassis never compromises on performance.

Keep your PC On-Point with the Dedicated Space

Cooler Master Q300L Component compatibility

MAIN COMPONENTS CLEARANCE The Masterbox Q300L case supports CPU coolers up to 159mm in height, GPUs up to a length of 360mm and power supplies up to 160mm in length. Behind the motherboard tray this impressive case offers a 28mm wide space to keep your cables tidy and hidden away, allowing your build to show off what’s truly important.

Enjoy a Vast Range of Setups

Cooler Master MasterBox Q300L Positions

VERSATILE VERTICAL AND HORIZONTAL POSITIONING The Masterbox Q300L can be placed on its on its side or kept vertical to optimize your space or to change up how you display your components.

Impressive Filtering providing a Clean Build

Cooler Master MasterBox Dust Filtering System

GEOMETRIC PATTERNED DUST FILTERS The unique pattern on the dust filters creates an impressive exterior for the chassis to make your rig stand out from the rest.

Core Chassis Specifications
Case Edition MasterBox Q300L
Case Form Factor Mini Tower
Motherboard Form Factor
  • MicroATX
  • Mini-ITX
Reverse Connection Compatible No
I/O, Bays & Expansion
Front/Side/Top Panel I/O
  • 1 x Headphone Out
  • 1 x Mic In
  • 1 x Power Button
  • 1 x Reset Button
  • 2 x USB 3.0
Drive Bays
  • 2 x 2.5" Internal
  • 1 x 3.5" Internal
Standard Expansion Slots 4
Vertical Expansion Slots  
Fans & Filters
Fan Bays
  • 2 x 120/140mm
  • 4 x 120mm
Fans Included 1 x 120mm
Fan Controller/Hub  
Dust Filters Bottom
Liquid Cooling Support
Front Radiator Compatibility 1 x 120/240mm
Top Radiator Compatibility  
Bottom Radiator Compatibility  
Rear Radiator Compatibility 1 x 120mm
Side Radiator Compatibility  
Max CPU Cooler Height 157 mm
Max GPU Card Length 360 mm
Cable Routing Space  
Side Panels
Window/s Yes
Window Configuration 1 x Main Side
Window Construction Plastic
LED Lighting Functionality
LED Lighting No
LED Lighting Emitters  
LED Lighting Colour  
LED Lighting Support & Control  
Power Supply Compatibility
PSU Included No
PSU Wattage (If Included)  
PSU 80+ Rating (If Included)  
PSU Support ATX
PSU Mounting Location Top Mount, Rear
Max PSU Length 160 mm
Chassis Physical Specifications
Colour Black
Chassis Construction Materials Steel / Plastic
Dimensions 230 x 378 x 387 (WxHxD mm)
Weight 3.7 kg (Approx)
Package Type  
Please Note  
Additional Information
Scan Code LN86432
Model Number MCB-Q300L-KANN-S00
GTIN 4719512065488

Please note your statutory rights are not affected.

For further information regarding Scan's warranty procedure please see our terms and conditions

24 months
Return to base
DOA Period:
28 days
RTB Period:
24 months
Manufacturer Contact Details
0871 472 4747
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Cooler Master MasterBox Q300L, Black, Mini Tower Computer Chassis, w/ Window, micro-ATX/Mini-ITX, 120mm Fan, USB 3.0 is rated 4.4 out of 5 by 14.
Rated 3 out of 5 by from Looks amazing, was super easy to build in, but was twisted. Sadly while it looked great and was real enjoyable to build in, the plate the motherboard screwed into was twisted, so that it moved and creaked under pressure and was a good 2mm higher on one corner so it wouldn't screw down properly. If it was just mine that was faulty then its a great case, but it may just be a flimsy case design.
Date published: 2020-08-24
Rated 3 out of 5 by from Good starter case, but very limited space to move. I bought this case for my first build and I chose it because it doesn't look like all the others and offers good (but not, it turns out, great) cooling. It's cheap which if you're building a budget system is what you're after. One of the issues I ran into early doors is that the steel is very thin and flexes/bends very easily so take care when screwing in fans. The second challenge I faced is the lack of space behind the scenes where the cable management needs to happen, so once the PSU cables, SATA and fan cables are tucked out of the way it gets very crowded. All in all, it's a decent case, I now wish I had spent another £10 - £20 on something a bit bigger with better build quality, but this will do me for now so I am not completely disappointed.
Date published: 2020-07-23
Rated 5 out of 5 by from Great case for the price The cable management is really good and the case looks really nice. However I wish it had a tempered glass side panel instead of acrylic but it’s still a good case for the money
Date published: 2020-07-18
Rated 5 out of 5 by from No Complaints Cheap, stylish case that was a pleasure to work with.
Date published: 2020-07-14
Rated 5 out of 5 by from Very good for the price Great case which offers lots is flexibility. I needed an inverted case to sit on the left hand side of my monitor, and this worked great! Additionally, I drilled 4No. 120mm holes in the case for the 2No. front fans, top fan and bottom fan using a hole saw, to increase airflow. For the price you are sacrificing tempered glass for an acrylic panel. I added a 20% tinted film to the window for a darker finish which hides any cables well, only showing the RGB elements.
Date published: 2020-07-10
Rated 5 out of 5 by from It’s Case building in I do recommend get this case ;) I really like this Case came fast easy building in case there lot room at back of case Yes I recommend this Coolermaster Q300L I am Very Happy ;)
Date published: 2020-07-09
Rated 5 out of 5 by from Excellent product by coolermaster. Used to have a clunky Corsair case before, but this slimline Coolermaster case with its intelligent modular design and easy removal filters make this perfect for me to keep on the corner of the desk. Fit perfectly for me and couldn't ask for anything better in a case.
Date published: 2020-05-05
Rated 4 out of 5 by from Almost no complaints Excellent case. Loads of room/access and lots of options for tidy cable management. Very clever design and nice solid construction. Only drawback for me is the i/o panel. While being able to position the panel in any one of 6 locations sounds great, the panel can only be paired with the windowed side cover. So if you put the i/o panel on the right hand side of the tower the glass panel creates an ugly view of all the cable routing underneath the motherboard. Not a big problem but was a small niggle for me as I wanted the i/o panel on the right and the glass on the left to display all my fancy led fans! ;-)
Date published: 2020-03-07
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Aio cooler

Will a corsair h110i fit into this case?
Asked by: Tommytucka
No, according to the Cooler Master product page; 'The front supports up to two 140mm fans and up to a 240mm radiator. The rear supports a 120mm fan or radiator and the top two 120mm fans. All to ensure you don't have to compromise on performance.' I havce a Corsair H100i in mine and fits really well. Hope that helps...
Answered by: NemesisTW
Date published: 2020-07-24
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CoolerMaster MasterBox Q300L Windowed micro-ATX/ITX PC Gaming Case
CoolerMaster MasterBox Q300L Windowed micro-ATX/ITX PC Gaming Case