At first, I started at 1/3P pulling two inputs per tapeloop. That came in at 73I, but had 4 repeat instructions. And so, I moved to 1/6P and built around Arm 1.

This puzzle's cabinet layout effectively forces 3 separate chambers for 
input + purifjection, anime and output. Mine take 19i + 15i + 23i respectively, and I'm guessing a top solution will have numbers closer to 15i for all three: There has to be a more efficient way to build the output in 1/6P that I'm missing. 

As such, I expect that people have achieved sub-50 instructions. I will be amazed if sub-40 is possible, but this community never ceases to amaze. 
