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^ had that problem too, wasn't able to get any card to print other than the one that shipped w/ the mp... tried formatting from a windows (tried each diff. block size type, 1024, 4k, 8k etc.), then formatting from gparted with 2gb and 1gb size, fat16, then fat32 in linux and mac also the Fat and Fat32 options on a mac. all no luck.
although, I had an old raspberry pi model a (the one with the s-video output) in my parts bin, threw octopi on there, and I've been up and running (almost non-stop) with solid 3d prints for the last few weeks. I would definitely recommend it as a work around!