This is a Mark 2 of the simple SD Card holder. This version still holds 8 cards but now the slots are a little bigger making it easier to get the cards in and out. Rather than using tight slots to keep the cards from falling out I have added a lid to this version which clips on nice and securely.Print the base and the lid. You will need to lightly sand the clips just to clean up a bit of the overhang.If you have already printed the original cardholder then the lid fits on the old one if you use a soldering iron to melt a couple of indentations for the clip.