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Cooler Master MasterBox Q300L Micro

Original price was: $39.99.Current price is: $36.99.

(8 customer reviews)
Last updated on April 16, 2025 9:10 pm
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$37.99 Amazon.com
November 7, 2024
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January 1, 2025
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$36.99 Amazon.com
April 17, 2025
Since November 7, 2024
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Set Alert for Product: 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) - $36.99

Specification: Cooler Master MasterBox Q300L Micro

Product
Brand

Model

MCB-Q300L-KANN-S00

Main
Color

Charcoal

Specification
Best Seller Ranking

#37 in Computer Cases

Internal 2.5 Drive Bays

2

Features

High Flexibility for System Building: The I/O panel can be adjusted to six different locations. On both side of the body you can install the I/O panel at the front, top or bottom.Minimized Dimension with ATX PSU Support: Despite the Micro-ATX form factor and the body depth and height of only 370mm x 370mm, the MasterBox Q300L can accommodate a normal ATX PSU.Patterned Dust Filter: Special pattern on the dust filter creates a unique outlook for the chassis.Clean Routing Space: Behind the motherboard tray, it offers 28mm wide and spacy room for hidden cable management.Excellent Thermal Performance: The open design of the perforated front, top and bottom guarantees excellent thermal performance.Edgo-to-Edge Acrylic Transparent Side Panel: Show off your build through the full size transparent side panel.Vertical and Horizontal position: The case can be put in vertical and horizontal position.

Weight

8.16 lbs.

Dimensions H x W x D

15.00" x 9.06" x 15.24"

Max PSU Length

160 mm

Max CPU Cooler Height

157 mm

Max GPU Length

360 mm

Radiator Options

Front – Up to 240mm, Rear – Up to 120mm

Fan Options

Front – 2 x 120mm, 2 x 140mm fanRear: 1 x 120mm fan (Pre-installed)Top: 2 x 120mm fanBottom: 1 x 120mm fan

Front Ports

2 x USB 3.0, Audio In & Out

Expansion Slots

4

Internal 3.5 Drive Bays

1

Dust Filters

Bottom

Side Panel Window

Yes

Motherboard Compatibility

Micro ATX, Mini ITX

Power Supply Mounted

Bottom

With Power Supply

No

Case Material

Plastic, Steel

Type

Micro ATX Tower

Series

MasterBox Q300L

Date First Available

February 09, 2022

Photos: Cooler Master MasterBox Q300L Micro

8 reviews for Cooler Master MasterBox Q300L Micro

4.9 out of 5
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  1. Anonymous

    Pros: styling ease of use modular io board build quality Cons: rough cut/jagged filter cover edges no grommets Overall Review: This is for a budget build and is an insanely cool looking case. For the price it is extremely hard to beat.

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  2. Anonymous

    Pros: Great airflow Small (did i say small) Cable management is great. This case seems very cheap due to it being so light, but it is well build. This case is very small and I love all of the universatility for the case. I am running a ryzen 2200G build with 2 140mm and 3 120mm fans with it being underload i am getting between 55 and 60C. This is using the stock cooler from my Ryzen chipset. This would also be a great case for lan parties with it being so light. Cons: I really wish the…

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  3. Lain M.

    Pros: – small – easy to build in – air flow is nuts Cons: none Overall Review: This is an excellent budget case. I transfered my brother’s rig into this from the Masterbox 5 lite and what an improvement. The air flow in this case is super good! I love the magnetica dust filters, you can reposition the front i/o and it manages to stay tiny without feeling restrictive.

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  4. Marshall J.

    Pros: I love this case. First mATX build. Plenty of room left in there too, will hold a nice sized graphics card, easily 12.5 inches of room in there. Cons: I. Love. Lamp? Overall Review: Highly Recommended for mATX. Cool qubits

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  5. Michael C.

    Pros: It’s cheap, and it has airflow second only to a test bench. Has some built-in cable management. Dust filters are easy to remove and clean. Cons: Not spill-proof Not the easiest case to build in (i.e. installing boards and drives). Almost no elevation on the feet, you may want to install power supply upside down (fan up) Built-in case fan doesn’t really push much air. Overall Review: Replace the exhaust fan with something better, put a couple 120-140mm fans in the front and use software…

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  6. David J.

    Pros: -looks great -cools great -tons of room for a mATX case -ATX power supply -The side panel screws on the metal side are rubber and can be used as feet to lay it down on its side -plenty of room for cable management -great idea to place the filters on the outside incognito Cons: -the slots in the back for the GPU are not replaceable, punch out only -the front panel does not have holes for fans, you use the ventilation holes – you can’t center 120mm fans on the front Overall Review: I…

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  7. Douglas M.

    Pros: Can’t argue about the price, perfect for budget build! Love the design, These magnetic filters/covers are awesome!! Lots of room for future upgrades. Box can lay on side or upright with rubber stands, nice addition! Plenty of room for fans, thanks for the free one! Cons: well…those PCI covers aren’t reusable, but you can buy replacements. and no drive bay (don’t need anyway- download everything today, think budget build) My large graphics card will have no problem fitting in here….

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  8. Hugh

    Pros: -Compact yet roomy enough for big GPUs and most standard CPU coolers (Coolermaster Hyper 212 Black LED at 157mm fits just right with a mm or two to spare. -Great cable management -Lots of ventilation/fanconfigurability Cons: -Could use another CM or so above the MB for a second exhaust fan. With an aftermarket full size cooler it’s quite cramped. -Screws and threads are quite cheap and come close to stripping easily -Of all the holes on the front, top, and bottom panel, only one of the…

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    Cooler Master MasterBox Q300L Micro

    Original price was: $39.99.Current price is: $36.99.

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