got some sd cards? store them in this interlocking SD card holder which has space for 6 x SD card 2 x microSD need more? print additional pieces and connect! you can add a 9mm sticker to the front for easy identification. there is even a 4mm hole if you like things screwed :-)infill: 33% infill or similar layerheight: for fast printing choose the highest layerheight. print time: about 30 minutes, depending on your printer & settings.