It is convenient to upgrade, directly insert the upgrade module into the aluminum profile chute on the left, and lock the screw. Insert the extension cable into the TF card slot. Free multi-function card reader, support hot swap, plug and play, can read and write SD/MS/TF/M2 cards. Large-capacity SD card, small, light, thin, with high memory capacity, fast data transfer rate, great mobility flexibility and good security. Ender3/3S uses a small card TF card, and the card slot is located below the molding table, which is inconvenient to remove and insert, and mainstream 3D printers mostly use large card SD cards. When you have multiple 3D printers with similar printing sizes, When using the memory card is different, the swap file becomes extremely troublesome. Our products are simple to refit, convenient to store, high quality, replacement for ENDER3/3s.