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Description
Cooler Master MasterBox Q300L Case, Black, Mini Tower, 2 x USB 3.0 Type-A, Edge-to-Edge Acrylic Transparent Side Panel, Unique Patterned Front & Top Dust Filter, Modular I/O Panel, Vertical or Horizontal PositioningThe MasterBoxQ300L is your straightforward option in the lineup of the brand new MasterBox Q series from Cooler Master. A series that might be small in size but excels in functionality and modularity without compromising on the thermal performance. Although the size wouldnt tell, the MasterBox Q300L supports a standard ATX PSU which we dont see often in the market with this size. Based on the different system setup, the I O panel can be adjusted to
The MasterBoxQ300L is your straightforward option in the lineup of the brand new MasterBox Q-series from Cooler Master. A series that might be small in size but excels in functionality and modularity without compromising on the thermal performance.Although the size wouldn’t tell, the MasterBox Q300L supports a standard ATX PSU which we don’t see often in the market with this size. Based on the different system setup, the I/O panel can be adjusted to six different locations, three options at each side of the case. You can decide which setup fits your system best.
Due to the cube design of the frame and special pattern design on the magnetic dust filter will make the chassis stand out from the rest. The combination of a practical design and the unique customizable outlook makes the MasterBox Q300L the perfect choice for office and home usage.
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 MasterBoxQ300L 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.
- Edge-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.
Model
MasterBox Q300L
MCB-Q300L-KANN-S00
Colour
Black
Materials
Steel
Plastic
Dimensions ( L x W x H )
387 x 230 x 378 mm
Motherboard Support
Micro ATX
Mini-ITX
Expansion Slots
4
Drive Bays
5.25": 0
3.5" HDD: 1
2.5" SSD: 2
I/O Port
2 x USB 3.0
Audio In / Out
Pre-Installed Fans
Front: N/A
Rear: 1 x 120mm
Fan Support
Front: 2 x 120/140mm
Top: 2 x 120mm
Rear: 1 x 120mm
Bottom: 1 x 120mm
Radiator Support
Front: 1 x 120/240mm
Rear: 1 x 120mm
Clearances
CPU Cooler: 157mm
PSU: 160mm
GPU: 360mm
Cable Routing
Behind MB Tray: 28mm
Power Supply Support
Bottom mount
ATX PS2
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.8 ★★★★★
Based on 26 reviews
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Product Reviews
★★★★★ 5
Worth it - just buy it!
Color: Matte Black
After a month experimenting with my new Breville Barista Express, I finally decided that a few of the basic accessories actually would make a difference in my coffee, so I got this as well as a distributor tool, and there is a noticeable difference. I consistently get excellent extractions, where before, I would occasionally get a shot that clearly was not distributed and tamped properly. The price for these tools was combined, less than $30 and most definitely worth it!
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Reviewed in the United States on January 4, 2026
★★★★★ 4
Great to use, little difficult to put away
Color: Matte Black
It's a perfect wdt tool and works wonderfully for it's entended purpose. Great weight to it and the base, however the base to store it is very slim, making it difficult to replace once done.
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Reviewed in the United States on January 2, 2025
★★★★★ 5
Good
Color: Matte Black
This is used nearly daily, it’s been about a month, and I haven’t noticed the needles falling out. I didn’t research if these needles were the right size for perfectly distributed coffee, but it breaks up my clumps very easily and efficiently. I made a lot of changes for my new espresso machine that have improved my coffee, and I would guess this would definitely be one of them. If you buy a WDT tool, I did my research and I can’t complain about this one that I bought. It even came with replacement needles. Would buy again. It feels nice, and I even wipe the needles after each use with a wet and then dry towel, and they still stay in place. You can bend them if you want them angled or straight.
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Reviewed in the United States on March 11, 2024
★★★★★ 5
Works well
Color: Matte Brown
I bought these for my Flair Pro 3. It does help declump as expected.
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Reviewed in the United States on December 31, 2025
★★★★★ 5
Wish I had one before
Color: Matte Black
Nice little tool. I never used one before and it does make a difference when evenly distributing the grounds and taking any clumps out.
Would recommend.
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Reviewed in the United States on January 17, 2026