Gundam Unicorn “Laplace’s Box” Pen Holder

The idea for this project came from the Universal Century Charter inside Mobile Suit Gundam Unicorn’s Laplace’s Box.

When I first saw its geometric design, I thought — this looks like a perfect pen holder.

So I decided to design and 3D print my own version: a functional desk organizer inspired by that legendary artifact.

Supplies

Size

171 × 117 × 110 mm (after 1450 % scale)

Material

Grey PLA filament

Tools

3D printer, hot air gun, hobby knife, side cutters

Purpose

Store pens, modeling tools, and small parts

Software

Modeled in Sharp 3D, sliced with Orca Slicer

I modeled the box in Sharp 3D, keeping the angular, symmetrical look of Laplace’s Box.

The lid is a hexagonal cap that opens to a small compartment for parts or screws.

Inside, I added a triangular grid (edge ≈ 3 cm) to organize tools.

To maintain printability and strength, I kept all wall thicknesses above 2 mm and used proportional scaling for a total height of about 11 cm.

I used grey PLA on an FDM printer.

Print settings

Printing took around 8 hours, and the model came out cleanly with minor stringing.

Cut supports carefully with side cutters to avoid scratching the surface.
Use the hobby knife to scrape off leftover brims and small seams.
Apply low heat (≈ 200 °C air) from the hot air gun at a distance — just enough to smooth out thin strings and restore the matte grey finish.
Avoid heating one spot too long to prevent warping.

The final model measures 171 × 117 × 110 mm, large enough to hold multiple pens, knives, and pliers.

The triangular inner grid keeps tools upright, while the top lid compartment stores small spare parts.

The surface retains a subtle PLA texture, giving it a solid, mechanical look that fits the Gundam theme perfectly.

I also uploaded it into Makerworld, you can print this by the link:

If you love model-making or mechanical design, this is a fun way to bring a piece of the Universal Century to your own workspace.