Custom Cooler Master MasterBox Q300L

Available below is a fully customizable Cooler Master MasterBox Q300L. Please click on “Processor” to get started. Then there will be a series of component options to choose from. Prices include labor costs, shipping to the United States, and a one-year warranty. Contact me at with any questions.


The Cooler Master Q300L is a well-ventilated pc case that supports fanless CPU coolers. The case measures 15.2×9.1×14.9 inches (LxWxH). It is compatible with Micro ATX motherboards. There are 4 standard size PCIe slots for expansion cards. The side of the case has a power on/off button, two USB 3.0 ports, and an audio in and audio out jack. It is compatible with external or internal power supplies. The case can be laid vertically or horizontally.


All orders come with a one-year warranty and free shipping in the United States. International shipping is a flat $100. All PCs are stress and performance tested to ensure component compatibility and function. Please allow 2-3 weeks for procurement and build time before shipping. Contact me at with any questions or for a custom PC with components not listed on this website.

Additional information

Weight 1 lbs
Dimensions 1 × 1 × 1 in