This is a bona fide “bad idea.” If you have a friend with whom you share an exceptionally close relationship—so close that you’d even consider playing a prank on them, knowing full well they won’t retaliate—or a neighbor whose emotional roller-coaster ride you’d love to put them through, then this model is tailor-made for you.

Design concept: In the Chinese cultural context, few characters evoke such wild imagination and deep-seated fear as the large circle enclosing the character “chāi” (meaning “demolish” or “tear down”). It symbolizes the end of the old order and the legendary promise of “getting rich overnight.” This model is a precisely cut, 3D-printed hollow template that recreates this iconic symbol: the character “chāi” with a broken circle.

What you can do with it (prank guide):

1. Preparation stage: Print this template. Any color will do, but we recommend using a rigid material.
2. Infiltration: On a dark, stormy night (or when they’re not home), secretly affix the template to a prominent wall in their house—preferably right by the front door.
3. Execution: Grab your spray paint. For a more realistic effect, choose a bold red or the vintage blue-green shown in the image, and aim the spray directly at the hollowed-out areas.
4. Retreat: Carefully peel off the template, leaving no trace.

Expected outcome: The next morning, your friend or neighbor will wake up to find this massive “chāi” character staring back at them as soon as they open the door. In that instant, their emotions will be a complex mix of shock and anger—followed almost immediately by greed and euphoria. They’ll instantly start calculating: How much compensation will I get? How many apartments can I buy? Can I finally retire?

Their expression when they realize it’s just a joke will be worth every penny.

Printing recommendations:

• Material: PLA or PETG are recommended. If you want the template to adhere more securely to rough walls, try a flexible material, or apply a layer of flexible tape to the back of the print.
• Layer height: 0.2 mm is sufficient; there’s no need for extreme precision.
• Filling: 15–20% is enough to ensure structural integrity.
• Size: Feel free to scale the design according to the size of the prank you’re aiming for, but we suggest keeping it reasonably large so it doesn’t lose its visual impact.

⚠️ Disclaimer: This model is intended solely for entertainment and pranking purposes. The author assumes no liability for any property damage, personal injury, neighborhood disputes, or legal consequences arising from the use of this template. Please ensure you obtain consent beforehand, or use it only in safe settings that do not harm public or others’ property. Remember, the essence of a prank lies in “fun,” not in “destruction.”