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)








Key features
- •I/O panel can be adjusted in 6 different locations and the Case can be positioned: vertical or horizontal
- •Edge-to-Edge Acrylic Transparent Side Panel offers a full view inside
- •Body depth height: can support normal size ATX power supply
- •Front Magnetic Design Dust Filter with open perforated front, top and bottom for high air performance
- •Extra space behind the motherboard tray for hidden cable management
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)
List Price: $69.82$62.84DEALYou Save: $6.98 (10%)
Free shippingFree Returns – 30 daysFree Order CancellationSecure Payment2–3 Days DeliveryGet It June 23, 2026In Stock (14)No marketing spamNo account requiredFulfilment by FedEx / Amazon / UPS / ShipwirePayPal / Card Buyer Protection
Customer Reviews
Reviews sourced from verified Amazon purchasers4.5
out of 5
Based on 10 reviews
5★
50%
4★
50%
3★
0%
2★
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1★
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Amazing.
Hunter✓ Verified Purchase•July 25, 2023
I wanted a case that can fit a large GPU but take the smallest space. This pc case is incredible. I've got 2. And are going to buy 3 more to use as ArtNet/rendering stations. Absolutely incredible and only take up 4-5Us of rack space. I think I can fit a 4090 in one with almost no clearance space if I were to try.
I will say. The magnetic dust covers are nice and all, but they can easily fall off if you peel at them. They stay put by themselves and this isn't a dealbreaker at all
I will say. The magnetic dust covers are nice and all, but they can easily fall off if you peel at them. They stay put by themselves and this isn't a dealbreaker at all
No slots for dvdrw
don'thaveone✓ Verified Purchase•July 4, 2023
Nice case. Plenty of room. Just wish there was at least one skit for a dvdrw or similar drive
MICRO ATX😆
Josue Escobar✓ Verified Purchase•June 29, 2023
Finally got around to build my micro atx build that I've been dying to build diffently recommend this case 👌 for anyone that's looking to build in it just remember micro atx cases are small so might have to stick your hand in to plug in the cpu cable recommend connecting the cpu before putting the motherboard into the caseðŸ˜
Needs high static pressure fans
Laryssa Skiles✓ Verified Purchase•June 21, 2023
This is a nice small case at this price point, and it fits a full ATX power supply and a big GPU. The window is tinted so if you don't have loads of RGB your build is tastefully concealed, the "front" port placement is a little odd but nice in that you can move it to either side of the case (albeit putting the window on the wrong side), and the little rubber feet on the right side that let you use it as a laughably thick desktop case are a nice touch. The sheet metal is cheap but sturdy enough, cable routing in the top corner is difficult if you have a large cooler and install it before you finish your cable routing. The mesh "filter" panels look cool, but like other reviews have mentioned they're rough around the edges and slide off of the case so you have to either take them off or be very careful when lifting.
But the BIG problem that nobody has mentioned is this: the airflow of this case is laughable. Now you may be thinking, "but the whole thing is mesh!", but that's where you would be wrong. See, the "mesh" is not all that fine to begin with, but UNDER the mesh, the case is even less porous. I have no idea what Cooler Master, a company known for making well-optimized cooling products, was thinking. The fans everywhere except the one 120mm on the back are probably more than 70% obstructed. I would seriously hesitate to consider this case if you're using a radiator. You should either plan to (a) buy a very powerful fan for behind the cooler and run it negative pressure or (b) buy a bunch of high static pressure fans. I have 5 arctic P12s in this thing and they seem to do the job.
But the BIG problem that nobody has mentioned is this: the airflow of this case is laughable. Now you may be thinking, "but the whole thing is mesh!", but that's where you would be wrong. See, the "mesh" is not all that fine to begin with, but UNDER the mesh, the case is even less porous. I have no idea what Cooler Master, a company known for making well-optimized cooling products, was thinking. The fans everywhere except the one 120mm on the back are probably more than 70% obstructed. I would seriously hesitate to consider this case if you're using a radiator. You should either plan to (a) buy a very powerful fan for behind the cooler and run it negative pressure or (b) buy a bunch of high static pressure fans. I have 5 arctic P12s in this thing and they seem to do the job.
Cute and compact PC case!
Anthony M.✓ Verified Purchase•June 20, 2023
I managed to get this case for $18 on Black Friday using a combination of credit card points and promotional credits at the time. There was even a $15 rebate for this case I could have filled out to make it even cheaper for me but I forgot about it by the time the offer expired"¦
This case is compact and simple, perfect for my use since I have a tiny room. It's good to know that there is space for an aio in the case I want to upgrade my cpu cooler. The acrylic side panel is a big plus, making the insides look more aesthetically pleasing with RGB lighting.
This case is compact and simple, perfect for my use since I have a tiny room. It's good to know that there is space for an aio in the case I want to upgrade my cpu cooler. The acrylic side panel is a big plus, making the insides look more aesthetically pleasing with RGB lighting.
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