On a recent episode of Bitner built on YouTube, I designed a few simple shop holders (go check out the video if interested) This cubby is both a single and double opening, and there is a hook and opening on each side so you can securely connect as many of these in like as you like. When mounted to a wall via screws or the included French cleat files, it not only is the holder for the cubby drawers but also is a supportive shelf. I did a test print pal, 15% infill. and it held 20lb without breaking. if your looking to possibly have more look at more infill and other materials for the cubby specifically. Assembled with 5 bolts only if you want the French cleats.