Designed according to the specifications of LanGuo’s direct-ink acrylic markers, the pen holder can accommodate pens with a diameter less than 15 mm and a length greater than 120 mm. It also fits LanGuo’s non‑direct‑ink acrylic markers.

Since LanGuo’s acrylic marker series comprises nine pens per set, each layer can hold up to nine pens.

Each pen holder features a recessed slot at the bottom where you can insert color swatches cut from the packaging paper—or tuck in a small piece of paper measuring 10 mm long, 8 mm wide, and less than 1 mm thick—to clearly indicate the corresponding color.

The space beneath the pen holder is also ideal for storing miscellaneous items.

By default, the configuration uses an 8% infill density with single‑wall walls, offering optimal material efficiency while still providing sufficient strength and stability.