Here is a basic design I’ve been playing with. Uses standard NEMA motors, off the shelf parts, 80/20 extrusions, and custom 3D printed components. Air displacement pipetting module. Electronics are standard Arduino with the Ramps 1.4 interface board.
Still in process. I plan on releasing the base model under open source. Possibly for use in stem labs as kits for little or no cost.
I see what the Prusa brand did with their 3D printers and think that is a great model to follow.