Someone in Brazil drew this on Mandalagaba years ago and I’ve used it to stress test plotters since :). I wish I could get in touch to show them.
This one was cursed, I’ve been trying it for months and something would always go wrong. It’s been an endurance test and I’ve made adjustments from the results. It takes about 3 hours to run.
Hexagon Truchet tiles courtesy of reinder @ turtletoy.net.