The printer is displaying the message: The internal memory is full, the project cannot be copied. You can continue printing - however, you must not remove the USB drive mid-print, otherwise, the process will fail.
Error name: Can't copy project
Error code: #10704
Usually, once a model is loaded to the printer by a USB drive, you do not need to keep the USB connected to finish the print, as the SL1 will copy the model to its memory. When the Printing directly error message appears, it means that the printer cannot copy the file to its internal memory due to it being full. In order to print, you have two options: