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Descrição
I took the original files for the back part that holds it to the wall, then cut it in half, since it wouldn't fit on my little ol' ender 3 pro's bed. Added joint sticks to throw in there to hold it together, and voila. A shelf that I can print, too. No other changes were made. The actual shelf part is still the exact same file as before, reuploaded here for your convenience.
Wallshelf backpieces contains the entirety of the back hexagon, including the joints. The rest of the files should be specific enough for you.