Dust White Forbidden Zone: Arknights Pass NFC Card/Public Transport Card

Design Introduction
This design is a modified version of several projects. To hide and protect the chip, it has been modified into a stacked NFC card/bus card composed of three PCBs (two color silkscreen PCBs with a regular PCB with coils and pads sandwiched in between). This modification wasn't simply because stacking three PCBs is more comfortable to handle.
Color Silkscreen Image Design
The color silkscreen image style is modified from the Arknights pass image style. All images used in the modified version are from the "Dust White Forbidden Zone" forum.
PCB Introduction
This project contains two PCBs:
1. Middle Circuit Layer PCB
This PCB has coils and pads, mainly used for soldering the NFC chip/bus card chip and for communication. The NFC chip uses a 5x10mm or smaller COB package. If you want to solder a bus card chip like us, please ensure your bus card chip supports NFC functionality before removing it to ensure convenient recharging later.
2. Top and Bottom Color Silkscreen Layer PCBs
This PCB does not contain any circuit design and is only for decoration. You can modify the color silkscreen images on the PCB according to your preferences.
Prototyping
: 1. Number of PCB boards for the middle layer circuit
: 5 pieces. Solder mask color: White is recommended.
Other options can be left as default (remember to claim the coupon for free).
2. Number of boards for the top and bottom color silkscreen layers
: 10 pieces. Solder mask color: White. Pad plating: Immersion gold. Character process: JLCPCB EDA color silkscreen printing
. Other options can be left as default. The price for prototyping 5 color silkscreen PCBs is the same as for 10 pieces; only the shipping fee will be charged separately. 10 color silkscreen PCBs and 5 regular PCBs can be stacked into 5 sets.
Materials needed:
1. M2x4 double knurled studs *4 (outer diameter preferably less than or equal to 3.2mm)
2. M2x2 flat head hex screws *8 (head diameter 4mm, suitable screwdriver Φ1.27mm or Φ1.3mm)
3. NFC chip/bus card chip; NFC chip should be a 5x10mm or smaller COB package chip. If you're like me and want to solder a bus card chip, please make sure your bus card chip supports NFC functionality before removing it to ensure convenient top-up later.
Other materials
assembly video: https://www.bilibili.com/video/BV1FWvrewE4N/
Dust White Forbidden Zone Pass Template Link: https://pan.baidu.com/s/1F0HrMr1ZeUbAKjqgXWEClg?pwd=snow 
Extraction code: snow
Note: It's best to download the template from a cloud drive, as it may have been modified.
Modification Log
August 16, 2024
1. Partially modified the image template and re-uploaded it
. 2. Added Cassia, Fanny-Radiance, and Reeve-Infinite Vision. Image
References
1. Circuit and PCB Design Reference
https://oshwhub.com/242534lbw/ai-li-xi-ya-NFCka
https://oshwhub.com/zhiyuan338/fan-ka
2. Pad Reference
https://oshwhub.com/kctp/fanka
3. Original Color Silkscreen Image Source
https://www.cbjq.com/ 4. Color silkscreen image design reference :
https://www.bilibili.com/video/BV16P411Z729/