This thought came around when I was trying to think of ways to feed 6 advanced circuit assemblers with one copper cable assembler without any copper cable belts
This is always fun to do with anything that's a 1:4-6 ratio.
There are some interesting ratios if you try to do it with red + green + blue production (all at 1.25/s aka 12 blue, 6 green, 5 red asm3's). Engines, miners, green circuits, copper cable all get directly inserted, leaving belts needed for only belts, gears and the initial iron/copper.
I'm trying to do something similar to this but with green circuits or plastic in the middle. It's not quite working yet though