Samsung SPP 2040 - Manual (Page 32)

3.14
Removing memory cards
Please do not remove a memory card until the following steps have been taken.
When not connected to a computer
Gently remove the memory card from the printer.
When connected to a computer
1
Close the program you’ve used.
2
Gently remove the memory card from the printer.
Insert one memory card only.
If you remove the memory card while printing a job, the printing job will be
canceled.