UBB Store

Cooler Master MasterBox Q300L Micro ATX PC Case Compact Computer Case Black
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Cooler Master MasterBox Q300L Micro ATX PC Case Compact Computer Case Black
Price: US $54.01
Product Overview

Build your next high-performance system inside a highly versatile and compact Micro-ATX enclosure designed for optimal thermal efficiency and customization. Featuring a fully perforated layout, this computer case ensures consistent air circulation to keep your internal components running cool under heavy processing loads. Its clever modular design allows you to adjust the orientation of the system to perfectly match your desk space, while the full-view side panel offers a clear, edge-to-edge view of your hardware configuration.

Key Features & Benefits
  • Open Thermal Architecture: Fully perforated front, top, and bottom panels maximize cross-ventilation, facilitating rapid heat dissipation across all major internal hardware.

  • Modular I/O Placement: Offers unique structural flexibility with an input/output panel that can be repositioned to six different locations on either side of the chassis (front, top, or bottom).

  • Patterned Magnetic Dust Filters: Includes custom-designed magnetic dust filters that protect sensitive internal components from dust buildup while giving the exterior a distinctive, modern look.

  • Full View Acrylic Side Panel: Features a crystal-clear, edge-to-edge transparent side window to showcase your custom wiring, component lighting, and meticulous build layout.

  • Excellent Hardware Clearance: Formatted with a spacious interior footprint that supports full-sized graphics cards, substantial tower CPU coolers, and standard power supply units without spatial constraints.

Multiple Uses / Applications
  • Compact Gaming Rigs: Ideal for assembling high-end mATX or Mini-ITX gaming computers that require extensive cooling and large GPU clearance.

  • Home Office Workstations: Perfect for building low-profile, quiet, and space-efficient productivity desktops that fit neatly on or under small workspaces.

  • Custom Liquid-Cooled Setups: Highly adaptable for PC enthusiasts who want to install advanced AIO liquid cooling loops and multiple high-airflow cooling fans.

Product Details / Specifications
  • Product Type: Compact Micro-ATX Computer Tower Case

  • Motherboard Compatibility: Micro-ATX, Mini-ITX

  • Color: Matte Black

  • Cooling Support: Up to 5 x Case Fans / 240mm Liquid Cooling Radiator

  • Maximum CPU Cooler Height: 159mm

  • Maximum GPU Length Allowance: 360mm

  • Maximum Power Supply (PSU) Length: 160mm

  • Included Components: 1 x 120mm Rear Exhaust Fan, Removable Magnetic Dust Filters

Shipping Policy

All computer components are handled with the highest level of care and packaged securely in protective padding to safeguard against transit shock and cosmetic wear. We coordinate with reliable shipping networks to maintain quick and consistent handling times. If your shipment encounters any unexpected delivery delays, tracking discrepancies, or arrives with external package damage, please message us directly before opening an automated case or dispute. Our team will work quickly to ensure your delivery concerns are completely resolved.

Return Policy

Returns are accepted strictly for merchandise that arrives damaged, faulty, or incorrect. If you notice any structural defects or layout discrepancies upon unboxing your computer case, please contact us first via messages before opening an automated return claim. We maintain a highly professional, polite approach and will work with you directly to provide a smooth, prompt resolution.

Payment Policy

To ensure secure order validation and immediate warehouse processing, payment is required at the time of checkout. We accept all major, platform-approved payment methods. Your order will be officially scheduled for fulfillment as soon as secure payment confirmation is completed.



Buy Now