This 3D-printed pen holder, inspired by industrial chemical processes, seamlessly integrates a factory‑style pen compartment, piping, and a reaction‑tank motif. Its bold, industrial‑inspired lines are complemented by a modular storage design that allows you to organize pens, paper clips, and other stationery items. The “reaction tank” on the right can also serve as a small storage box, making it a desk accessory that combines creative aesthetics with practical functionality—perfect for engineers and chemistry enthusiasts who appreciate a workspace that reflects their passion.