I (42Genius42) came up with the SUM solution first – had a 688 for a while but some RHS chamber fiddling managed to reduce down to 632. Hard to tell what a good SUM score would be… if someone 1/6T’s or better the instructions somehow you can knock a lot off the score, but I can’t see an easy way to do this. <Spoiler for if SUMs are shown before CYCLES> The RHS chamber here is almost identical to the one in our CYCLES solution – with 2 arms and 1 bonder less in exchange for a few cycles more and different conduit positions.