As alluded to in this comment, under the question, Using dual Y stepper drivers on Marlin / RAMPS 1.4, there is a concept of an A4988 "twinner":
I am rather building an A4988 "twinner"
The question itself also mentions:
... add-on nanocard hosting a couple of twin A4988 drivers
Can anyone explain what this is, and/or how it works? Are there any schematics, design guides, PCB board designs that can be used, or pre-built versions available?
