This is one of my proudest personal creations. I’m now making the 3D model open-source for everyone to download. If you, like me, own a Jike electric vehicle or electric motorcycle, have you ever considered adding a protective case for your NFC key card? If you’re looking for just that, why not give my design a try?First, please confirm whether the NFC card in your possession is the standard small size, as shown in the image:

Currently, most mainstream Jike vehicles come equipped with this type of small NFC card. However, some models—such as the 2024 AE8 and AE6—may use a larger card (the size of a bank card), in which case my protective case won’t be compatible. Let me briefly explain this point.

The current design requires one hardware accessory: you can easily search online for “mother-and-child rivets” on major e-commerce platforms and select the 4×5 mm size, as shown in the image:

It’s very affordable—about 1–2 yuan for a set of 10 mother-and-child rivets. Just choose whichever supplier offers the best price. It’s important to note that when purchasing, you may encounter two types of screw heads: Phillips-head screws and hex socket screws. Regardless of the type, as long as the size is 4×5 mm, they can all be installed properly. For Phillips-head screws, use a Phillips screwdriver; for hex socket screws, the standard size is usually 2 mm, so a 2-mm hex wrench will suffice. The hex wrench included with the TONGZHU 3D printer is already 2 mm, so there’s no need to buy an additional hex wrench.

Below is an installation illustration—it’s very simple and easy to understand.