I have been thinking of a way to make a sittirer. I made some helical attachment. With the stepper I can stir left and right like a washing machine.
I made this. Im going to put multiple helical attachments on the rod.
I'm not experienced with fluid dynamics. But I have designed a second attachment that I've yet to try.
Archimedes' Spiral? 
Commercial stirrers might be good inspiration. I used one with an easy-to-clean disk on the end for hundreds of (individual) gallons of paint.
I was thinking ablut trying these but they are kinda expensive. 27.99 usd each but I think they might last a while.
They have a 7mm rod. The steppers have a 5mm shaft. I could only find 5mm-8mm couplers "on amazon" for the nema 17's so ill have to figure out how to makeup for the mm difference.
The 3d printed attachments seems OKAY but idk about the rod. The rod may not last long so I'm thinking of the next plan.
It is a different question than how to program a stepper, but what is your application? What are you stirring?
If you are designing the whole thing, use a rod the same diameter as your stepper and just drill a hole and add some set-screws.
Threading the other end and adding some nuts and fender washer as a disk-paddle could be adequate for many purposes. And also an easy platform for experiments.
What is the the spot on the shield labeled "A" on the shield. is this for a 4th motor? How do i use it?
There's X,Y,Z,A not sure what A is for. didn't find much about it online
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