Print all five files at the same time next to each other and then assemble them using 12mm M3 socked-head bolts and M3 nuts. I recommend sanding the contact surfaces with water and a high grit and then lubricate them for better performance. Doing this also allows you to tighten the nuts more without creating friction making it more stable. I prefer lock-tight on the screws if you intend to use it for a while, mine have come loose before. Otherwise, have fun and don't poke anyone in the eye. Also, I don't know where the BM62 comes from so I just incremented it to BM72 because I thought it made sense.
Changes from the original:
The author remixed this model.