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Cooler Master - MasterBox Q300L MicroATX Mini Tower Case

( 4.5 Average / 25 Ratings )



Cooler Master


MasterBox Q300L

Part #





MicroATX Mini Tower

Includes Power Supply


Internal 2.5" Bays


Internal 3.5" Bays


Motherboard Compatibility

Micro ATX, Mini ITX

Front Panel USB 3.0 Ports


Maximum Video Card Length

360 mm / 14.173 "


387 mm x 230 mm x 378 mm

Completed Builds Using This Part

See All Completed Builds


Prices for this part are not available.

Price History (Excluding Tax) History:


steveheavy 15 points 10 months ago
from completed build Downsized Build

One of the best cases I've ever seen, only downside is the acrylic panel is a dust magnet.

Lavazutra 17 points 9 months ago
from completed build Tiny and Tidy

For the price tag....it is awesome. Small and specious, good looking and easy to work with. It has some minor issues though. 1. No antivabration mounts for the 3,5" HDD 2. Acrylic side window....dust/scratch magnet. 3. the pre drilled holes in the front panel cause air turbulence, which leads to more noise at high fan rpm (140mm fans)

Everything else is good and well thought.

ozals 8 points 8 months ago
from completed build Haswell and Maxwell

Pretty good case for the money, really nice outside and I like the idea of removable dust filter, my problems are only with the PCIe brackets and the back case fan.

elvarg9685 16 points 6 months ago

Now this is the true star of my build. I love how easy it was to build in. The cable management was super helpful. Only complaint I have is that the magnetic screens on the exterior of the case fall off easily so I'm taking a star.

Gilroar 8 points 6 months ago
from completed build A Little Old, And A Little New

Compact and Roomy 4/5 only because of the limited space available for storage. It also will fit taller coolers then listed, but only when the I/O is mounted away from the CPU cooler. Ventilation is okay but the dust filtration is somewhat poor.

WasThatSketchy 5 points 5 months ago
from completed build Dedicated Streaming PC (Updated)

This case is amazing for the price. It has awesome side panels, nice magnet mesh to go over the front and top of the case. And, it can be inverted and flipped upside down, exactly what I needed.

Matt_bot 5 points 5 months ago

Awesome aesthetic case. Checks off all major points in terms of compactness, flexibility and customization. The magnetic filters are prone to warping during transport, and feel a little flimsy but it's fine otherwise. Great airflow and fits all my parts!

miller.eric79@yahoo.com 7 points 4 months ago

Good looking case, glass is tinted though. Airflow seems solid and cable mgmt is OK.

Sawyer2077 9 points 4 months ago
from completed build Budget Build

I really like the aesthetics of this case. Being able to put the HDD and SSDs hidden away in the back allows for ample space to decorate. I'll be interested to see what the GF does with it.

Building in it was a breeze except for the 8-pin CPU connector but half of that is on the power supply. It's 4+4 and there is very little room at the top of the case above the MB, so getting both pins in was a challenge.

csmyth662 2 points 3 months ago

Strange choice of build with this, such as the PCI-E slots that you have to remove at the back and the weird PSU mounting mechanism, but with beautiful looks and 3cm of cable management for this price, I can't say anything bad.