Do I have to disassemble the BrickPi3 case in order to get the SD card out?
No, you don’t have to disassemble it to take out the micro SD card. You can do it while the Pi is put inside the case.
How can I get the SD card out when the RPi is in the case?
Well, there’s a slid (on your case) through which you can pull out the micro SD card out of the Raspberry Pi.
You might probably want to have a look at the videos we have with the BrickPi3 and see that there’s an opening for the card.
I can see there’s an opening but how do I get the card out? There doesn’t seem any way to get hold of it.
I’m not particularly familiar with the BrickPi3, but we can ask @Matt about this thing. What do you think Matt?
It’s not convenient to remove when the case is assembled, but the SD card can be pulled out with a pair of tweezers.