I would first like to say that I loved this metric. This is my first time submitting to the tournament or a weekly, and I plan on becoming a regular. I also might be the only person who submitted to only bc and not sum which is funny.

My first solution was 534c, and the first version of this layout was 324c. The rest of the notes is a detailed explanation of my solution so feel free to not read it all.

The general idea of my solution is to build the core (the hexagon in the middle), and then add on the 6 atoms on the outside. The core is made up of 2 identical triples. One of these triples can be made quickly by one arm using a debonder and a bonder from the hex arm 3 starts on. Arms 3 and 4 first make one each, and then pass them off to arms 5 and 1 respectively, who bond them together. Once the core is made, it is still missing a bond, so arm 5 rotates it onto the other bonder in the bottom left, before passing it to arm 6.

The outside atoms are also 2 sets of one each, and can all be added in a rotationaly symmetric way with the bonder next to arm 1. The core is rotated by arms 2 and 6 in a 4 long cycle, which is the bottleneck for this part of the solution. The hex the atom goes on can be reached by arms 1 and 5, and both are used. As the core is being bonded, arm 3 is splitting the iron off the reagent. It is then rushed down to arm 1 and is only 1 cycle late to the core, which is the only time it ever has to wait. Just behind the iron is the earth, which is detached from the vitae by arm 7 on the lower debonder. The earth is put on by arm 1 and the vitae by arm 5.

As soon as arm 7 moves out of the way, arm 4 makes another triple like the ones from the beginning. This is then pulled down by arm 1 to the lower debonder and attached to the core. Arm 3 separates the earth and vitae and gives the earth to arm 1. Arm 5 then attaches the vitae to the core, and the roshambonite is now completed, to be outputted by arm 6 two cycles later.

The solution is 6p, so after giving the final triple to arm 1, arm 4 can start making the first triple for the next roshambonite. It cuts out 2 cycles, which is exactly enough so that arm 3 pulls it over the output on the first cycle that it is free. This is then repeated 5 more times, and then reset to the start to be able loop.