This is a creative 3D-printed model that combines mechanical mechanisms, a Halloween theme, and tabletop collectible play.

The model features a unique gear-driven dual-lid lifting mechanism: when you turn the skull-shaped gear knob on the front, an internal mechanical system moves the left and right racks, causing the top double lid to open simultaneously while the internal tray rises and lowers, delivering an interactive “surprise-opening” experience for hidden trinkets, holiday gifts, or collectibles.

The exterior design draws inspiration from a Halloween tomb, incorporating:

• A black-and-gray stone‑style tomb door structure
• Orange mechanical gears and coffin‑inspired accents
• Skeleton‑sealed emblems
• Dual‑winged coffin‑style opening lids

to create a visual effect reminiscent of an “ancient underground tomb‑like treasure chest.”

This model is not just a static display piece—it’s also a tabletop interactive toy with genuine mechanical feedback.

Structural Features

⚙️ Gear‑Driven Mechanism

A large gear knob at the front serves as the control interface, driving the lifting mechanism via an internal gear train.

The rotational action provides a distinct mechanical feel, making it ideal as:

• A desk‑top stress‑relief toy
• A Halloween decoration
• A collectible mechanism model

🪦 Dual‑Lid Lifting Design

The top left and right lids are mounted on independent hinge structures, connected by 1.75 mm PLA filament acting as pivot pins.

During opening:

• The two lids swing outward to either side
• The internal tray rises
• Hidden contents are revealed

resulting in a ceremonial, satisfying opening sequence.

🎃 Expandable Hidden Compartments

The internal tray can accommodate various themed items according to your needs:

For example:

• Small Halloween monsters
• Skeleton characters
• Mini gifts
• Candy
• Collectible figurines
• Surprise desk decorations

In the future, additional themed inserts can be added to further expand its versatility.