After making the changes you've always wanted, it's time to put everything together. Setting the 3DS output If you're editing 3DS ROMs, you may want to choose what kind of output you want. By default, it will output a folder whose contents you paste onto your 3DS's SD card for use with Luma 3DS game patching, but you can choose a variety of other formats. Refer to this section for instructions. Building Luckily, this is a one-step process. Simply click Solution > Build: