I don't know whether somebody else had this idea but I have played a lot and now I want to optimize everything I have with some design in it. So I was fiddling about some new designs and I landed where I am now and I want to share ist with you.
I thought about a useful design for crafting some electric furnances to let the machine craft with 100% speed. And I found a little tricky system I want to optimize in future but it's useful the way it is. Because you can stack as many as you want or need to one big productivity in here.
I startet with this and thought I will share. Suggestions are welcome:
A little plan of what this should be
it perfectly fits into each other
and fits as large as you need it to be
and even up to four ressources are easy to deliver to the roundabout while you can deliver the output factories as well
of course the amount of factories round about can be changed for what you need. But I love the general idea of this 
