Odroid Go Advance - SD Card filler.

thingiverse

This small piece fits snugly into the gap left by your finger when holding an Odroid Go Advance. Its beveled edge matches the Advance's own design, and a small notch prevents it from pressing against the SD card's rim. It also serves as a convenient nail gap for prying out the filler material when changing the SD card. The piece stays securely in place due to friction, although I've created a Customizer if you need to adjust it for your specific printer model.