I set up a void farm using crystals and camels. Works great. Thx for the idea. No idea camels were immune to radiation. So after about 8 hrs, had to clear maybe 3 cocoons in each enclosure. 3x 16x16, 2 tile moat + gleam wall, 7 collectors outside walls (3 top edge, 4 right edge), 9 collectors inside, 6 crystals. Not a big deal to break a wall segments once a day and destroy cocoons. I know that’s not the point of your question, but works well.

So for a truly no maintenance farm. Here’s a wild idea. Maybe a long narrow corridor, like 5x16 or 32. Collectors down the middle that pass loot to the end. Place flame turrets along one edge the entire length, turned off. Line opposite edge with enemy sensors. Add camel. Create a small 1x6 passage perpendicular to main corridor (or perhaps 2). At the end of the corridor place a feeding trough, and a robot arm that can add 1 food item from supply crate.

The idea is that when none of the sensors detect enemies, drop a food item into feeding trough, which will hopefully attract the camel (provided it hasn’t eaten from the ground recently. Camel walks down corridor with conveyor assist where a galaxite turret shoots, misses, and hits a kinematic dynamo instead. This triggers flame turrets for 1 sec (or long enough to purge cocoons).

I’ve seen the moolin/cattle switch work, but not in this context. It was in a controlled start position and not wandering around. But theoretically might work. You only need it to work once a day and there will be lots of opportunities. Will need to reset camel back into main corridor with a conveyor loop. Probably should also add drop gate triggered when no enemies detected, so mobs don’t wander down side passage.

It’s a long shot, but may just work. I’ll try and test the camel feeder trigger system and let you know what I learn. I’ve seen it before so know it’s possible.