Hey, Harry here to tell you the story of this solve from my perspective!
(If this is too long for you, TL;DR at the bottom.)

I had originally made a 22a 436c solve that used a glyph of disposal, and RP0 kindly listened to me ramble about it. Then I asked them if they wanted to be in a team with me, and they said yes, so mR_P0zzel became herR_P0zzel.

Isaac showed me a solve they had made - 20 area using a duplicator and tribonder. I had somehow ruled that out early on because I was stuck thinking about pulling reagents in equal proportions and didn't think "if a duplicator would skew the ratio towards fire, just grab more mors reagent, silly".

Still, Isaac's 20a solve was 667c. I tried to do better, and by adapting my previous layout I got a 447c. My solution didn't loop at all - it was a weird pseudo-loop where the first 18 instructions were one-time-only. But still, who cares, as long as it outputs 6 times.

Then RP0 cleaned it up, bringing it to 433c, and made it "loop" - the arm does some pointless movement every 6 products as a result.

TL;DR: Harry made a 22a solve with disposal, he joined team mR_P0zzel, Isaac showed him a slow 20a solve, Harry made a faster 20a solve by adapting the 22a layout, and RP_0 cleaned it up.

YAY TEAMWORK!