You guys are on a roll with interesting metrics for these weeklies, I love the idea of only using track motion in a cost puzzle. Solving this puzzle was really fun: because I'm using one arm, I had to decide what order the track would hit certain cells, and what could remain off-track. Specifically, getting Vitae onto the bonder took some clever routing. 

I'm fairly sure you can get away with using less track, specifically my waste portion. I think an infinite waste chain might be possible. It'd be hard to get it past the Earth/Water, but it's potentially doable if you stapled it to the end of the polymer.

This puzzle reminded me of how fun it is to sit and think about a puzzle before you attempt to solve it, I loved the process and I can't wait to see the insane lengths people have gone to bring the cost even lower.