I bought a 32 GB SDHC (Sandisk) I'd like to use for my Monoprice 3D printer.
I have downloaded Partition Wizard and partitioned a 2GB primary partition formatted as FAT and it still does not show any files.
What am I doing wrong?
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For an SD card to work with the printer firmware Monoprice suggests to format the SD card to FAT32.
However, the Monoprice Select Mini V2 is not able to read SDHC memory cards, it is advised to use an SD card (smaller than 4 GB) instead.
If the SD card is not recognized on the printer or if the files are not reading, it could be an issue with the actual card itself. The first thing we recommend checking is that none of the print files on the SD card contain a space in their name. This shows in the printer as an unidentified character and can cause issues. If none of your prints contain spaces, we recommend reformatting your SD card.
Note: If you choose to purchase an SD card, please make sure that it is not labeled HC (High Capacity) as it may not be compatible with the printer. This means that the card must be smaller than 4GB in size.
The last part of the support page is probably applicable to your card.
Some further information can be found in What is the largest microSD card that a Monoprice Select Mini can read?, specifically this answer. From this latter answer, I quote:
Cards between 2 GB and 32 GB might work, depending on the specifics of the card
Basically there are no guarantees when using large cards.
I was having problems formatting micro SD cards for my Monoprice Mini v2. I have some 256 MB cards tried formatting them FAT FAT32 etc, no luck.
Then I downloaded a program called SD Memory Card Formatter did the format on the card with this and the card is now readable in the printer.