A modular 3D-printed pen holder specially designed for desktop tool organization, featuring a detachable, modular structure that allows users to freely configure and combine modules to meet the storage needs of various tools.

- Tool-Placement Modules: The top module is equipped with five large-diameter circular holes, suitable for storing ballpoint pens, markers, and similar items; the middle layer includes eight differently sized slots (five small holes and three medium-sized holes), ideal for holding screwdriver bits, tweezers, probes, and other small tools; the side features open-ended storage slots for flat tools such as scissors and pry bars, enabling categorized storage and easy access at a glance.
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- Storage Module: The bottom section consists of a two-compartment open-top storage box, perfect for organizing loose screws, parts, and accessories, thereby keeping the workspace tidy.
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- Practical Design Details: The modules are designed with a snap-together assembly, making them quick and easy to disassemble and reconfigure, with the flexibility to add or remove modules as needed. The overall design features rounded corners to eliminate sharp edges, ensuring structural stability and compatibility with fixed desktop or workstation setups. This versatile solution meets the tool-storage needs of various scenarios, including manual work, repairs, and DIY projects, and can be customized to accommodate additional tool-specific modules as required.