Monitor arm extra hinge (double hinge adapter)

Range of motion for my monitor arm was very limited and couldn't fold it enough so i printed thins thingi and now i can. While at it i changed stock M8 x 40 screws with shallow allen socket for M8 x 50 with deeper socket. Could use some washers. At least 5 walls, top and bottom, and middle part needs supports (hole is m6 in case it falls inside the pipe), rotate so other parts don't need supports.

Update 1:
The holes in the 'heavy' seem a bit too big, which makes the whole thing a little saggy. For now, it holds my 27-inch screen just fine. I don't plan to update the files, but if you want, you can change the dimensions in the "step" file so that the holes are 8 mm instead of 8.5 mm to fit the M8 bolts more snugly.