Desktop Embedded USB Expansion Dock/Cable Management Box

This desktop USB docking station design, based on the SL2.1s chip, is designed for desktops with a 5cm+ round hole. It boasts high space utilization efficiency, featuring dual USB-A and dual USB-C ports, and even allows for cable routing, mimicking the mass-produced "smiley face" cable management box that cannot transmit data.
 
The project includes two versions: one with only two USB-A ports, which can be directly integrated into commercially available "smiley face" cable management boxes and is relatively easy to solder;
the other, the Pro version, adds two more USB-C ports and includes a specially designed 3D shell (exported using FreeCAD; I'm a 3D novice, please excuse the design). The shell is too thin and may crack during printing; modifications are recommended.
 
Testing showed that both versions, regardless of whether they have USB-A or USB-C ports, can achieve near-full USB 2.0 performance.
 
M1.2*10 screws are used.
A USB wireless mouse and keyboard terminal storage box is included in the file; this is a personal design and can be used as needed.
 
Soldering Precautions:
1. The external capacitor for the crystal oscillator has a small package, making soldering difficult. It can be omitted (and still work);
2. The pin spacing of the Type-C female connector is relatively small, so be careful not to cause solder bridging;
3. Solder bridging may occur on the chip, so it is not recommended to use a soldering iron;
4. Given the small size of the components, please check for short circuits between the four connection points before powering on (I personally had a charger blown and a circuit breaker tripped due to a capacitor short circuit).