How to Make a Cardboard Safe with Combination Lock | DIY STEM Project (Easy Tutorial)

Cardboard + a little imagination = a secret safe with a working lock! 🔒
In this video, I’ll show you how to make a mini password-protected box out of cardboard. No metal, no fancy tools—just creativity and some clever mechanics.

This idea is inspired by The Q, one of the channels that first amazed me with what you can build from cardboard. But here, I’ve focused on improving the lock core mechanism and breaking down the steps more clearly, so you can really see how a combination lock works inside.

It’s a fun DIY project with a hidden STEM twist—engineering, math, and design all inside a cardboard safe.

Give it a try, and see if your friends can crack the code!

Видео How to Make a Cardboard Safe with Combination Lock | DIY STEM Project (Easy Tutorial) канала Resilient Craft