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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
£39.98Item due on 21 July 2020
Due 21st Jul
spend over £225 and Buy Now, Pay Later or spread the cost of your finance over 24-48 months with a 10% deposit.
Delivery Options
  • By DPD to your specified address. | £5.48 Receive SMS with one-hour delivery window Weekend, timed and European delivery options are available at checkout

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    Weekend, timed and European delivery options are available at checkout
  • Collect instore Collect from our Bolton store, BL6 6PE | Free

    Order online, collect from our Bolton store (25-28 Enterprise Park, Middlebrook, Horwich, Bolton, BL6 6PE)

  • UPS and DPD Pickup Pickup from local convenience store | £4.79

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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
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 Contruction Materials Steel / Plastic
Dimensions 230 x 378 x 387 (WxHxD mm)
Weight 3.7 kg (Approx)
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 4.6 out of 5 by 10.
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
Rated 5 out of 5 by from Great case for a low cost build From the outset I am going to say that this is ideal for a build using integrated graphics and less than 600W power supply. If you keep to a low spec build then this case will not disappoint and will prove easy to assemble. If you start fitting high end parts (those that give out heat) then you start having to add fans as this case is not good at masking fan noise. I built a system using this case and managed to get in a 240mm radiator up front, 120mm radiator at the rear and another two exhaust fans on top. A 200mm long power supply (Corsair AX1200i) fitted inside without issue as did a Radeon R9 295X2. A GPU up to 13 inches long can fit, leaving enough room for the fan(s) to breathe because the power supply is not shrouded. The power supply is fitted slightly further into the case than standard which can cause clearance issues with the power supply cord. The PCIe slot covers are not reusable so only remove if there is something to go in their place. The removable dust filters on top and on front panel can become creased and the one underneath is easily damaged as well as not doing very much anyway. Case is well designed and it can be turned upside down so that the power supply is on top. Good value for money and even comes with one non LED fan. The acrylic smoked side panel can become scratched easily and may fall out once the four thumbscrews are removed. Lots of space behind the motherboard for cable management. I have no major complaints about this case other than air flow is not the best so you may need to add additional fans to keep temps under control.
Date published: 2020-01-09
Rated 4 out of 5 by from Cheap Compact case Good for the cost, feels like a 50 quid case but that's what I wanted, downsized from a fractal define as it has to go on the desk, good depth though it did fit a very large noctua fan
Date published: 2019-04-29
Rated 4 out of 5 by from Great little case bad acoustics I ordered this case on the recommendation of a friend who said it was good for the price and whilst that is true, the noise levels in the case are a little too noisy for my liking especially when the graphics card fans are going. The build quality is good, very sturdy and has a decent amount of space for extra cooling but this also impacts on the noise levels in the case too. I would recommend this case to someone who would only be using the oboard graphics on their cpu or as a media server.
Date published: 2019-03-15
Rated 4 out of 5 by from This case has potential! Pro's: On the sides of the case you can fit fans wherever the holes line up, yes there are holes smaller to indicate where the fans go but you could fit even two 240 rads if you have enough clearence from the motherboard.(would recommend the smallest pump/res you can find if you are trying to do this) The case can be any orientation you choose, be it flat, upside down or vertical as the feet are removable. The case has a nice side panel to cover cable management and storage drives. Con's: The window panel is standard plexi, the PCI-e covers are not reuseable and air flow will be restricting if you do not you High static pressure fans. Final summary: This case is awesome and compact, i get its cheap but a second Gen case with Tempered glass, reusable PCI-e covers and better materials would be a treat.
Date published: 2018-05-21
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Questions & Answers

Aio cooler

Will a corsair h110i fit into this case?
Asked by: Tommytucka
If is ATX power supply yes it will fit in :)
Answered by: Henry125
Date published: 2020-07-09
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CoolerMaster MasterBox Q300L Windowed micro-ATX/ITX PC Gaming Case
CoolerMaster MasterBox Q300L Windowed micro-ATX/ITX PC Gaming Case