Micro sd card extension mount
thingiverse
++UPDATE++ I added a new file for the same mount but the hole is now specifically designed for an M5 bolt and T-nut as per your request. For optimal results, I recommend using an M4 bolt and T nut at the front to provide better security to the extrusion. To ensure a smooth print, flip 90 degrees and print the object on its side with tree supports. Don't worry if the supports don't fully cover the gap where the SD card reader slides in - it's not a critical area and can be easily bridged with PETG. Post-processing is minimal to zero depending on how well your machine bridges the gap. I personally had one or two stray filament lines inside the SD card reader pocket, but that was just a minor issue.
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