The RecalTower is Recalbox's official modular case: a stack of floors that houses your Raspberry Pi 5 and the Recalbox accessories, each in its own slot, screwed on top of one another.
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Each module takes one floor, stacked in this order:
Floors are held together by nuts seated in dedicated slots and by the countersunk screws supplied with each module. So you can start with the Pi 5 alone and add floors later, as add-ons.
The full assembly is documented on the manuals of the modules themselves, step by step and in pictures:
WARNING: always remove the SD card BEFORE taking the Raspberry Pi 5 out of the case or putting it back in.
For any question, or to share your build, join the Recalbox Discord server.