Micro SD Cards Storage/carry Case

I started by designing a circuit board for my project. I followed a tutorial from the YouTube channel Great Scott, which made it quite easy to get started with Easy EDA.
The card holders are 2mm away from the edge to avoid sticking out too much while still allowing the cards to be inserted.
The through holes are 80mm apart on center and 3mm wide. Additionally, the board is symmetrical, so it can be flipped without re-designing.
After completing the design, I ordered the circuit boards, the Micro SD card slots, and the soldering paste from a Chinese vendor.