Discussions concerning the Ultimaker 2 / Ultimaker 2+ series of printers, including the Ultimaker 2 Go
There could be several issues why your printer doesn’t read the SD card. The most common is when the card has some issues itself. You should check if the files don’t have any space in their names. Why it is so important? The thing is when in a file name there are spaces then the printer see it as an unidentified character. If there are no spaces in the names then consider the option to reformate the SD card. Oh, don’t forget to check how to do it properly on the operating system you have on your computer. In case you want to read more about it check the printtopeer.com.