The pen holder is designed in the shape of SpongeBob’s “head,” with a hollow interior that naturally forms a storage compartment for stationery. Brushes, pencils, and other items can be inserted into the “mouth” or “vent” areas, satisfying practical needs while adding a lively, playful touch to the desk and turning everyday organization into an interactive experience with a childhood favorite. We recommend using PLA material—environmentally friendly, easy to print, and offering vibrant colors that perfectly capture the cheerful, childlike appeal of bright yellow. For infill, a density of 20% is ideal: this lightweight design maintains structural strength while reducing material usage and preventing excessive weight that could cause the pen holder to tip over. The layer height should be set at 0.2 mm to strike a balance between print speed and detail, ensuring crisp reproduction of the vent texture and facial expressions while minimizing layer lines that might detract from the cartoon character’s refined aesthetic.