@Eric_I My estimate right now before designing the carriage… 16"x16"x13"
Technical wiring two steppers to a driver isn’t a good practice either.
@Eclsnowman Nice! Personally, I’m hoping someday people will be able to have REALLY big 3D printers. I’m picturing one day having one that doubles as my coffee table and can print things the size of baseball bats. I’d never have to go shopping again! ;D
It is also standard wiring on my Printrbots. But I feel like they get slightly out of sync with each other sometimes…
@Shauki Couldn’t you make the same argument if the stepper drivers were not tuned to output the same current when using two steppers?
@Shauki I know ramps does it all the time. Doesn’t make it right though. Particularly when you get into higher torque and amp motors. Look at CNC routers with dual motors on y. You’ll never see a reputable company wiring two motors in parallel for that. They are always seperare drivers slaved by software.
I know it adds to the cost (perhaps unnecessarily) but adding some kind of rotary encoder so it is always known exactly how many revolutions have passed would help the 2 motor solution keep in sync. Again, perhaps unnecessarily complicating the design, but it would be more reliable w/r/t keeping the two motors in sync. Or…just use belts and pulleys with a single motor. 
I’ve been following your builds from your corexy build to your current conversion. I am just about to build my corexy so I’m curious why you decided to swap to an ingentis style gantry. I read that you had trouble getting round circles at higher speeds. Did you think that could’ve been fixed with proper belt tension and smoother linear guides, or does it just make more sense to swap over to the ingentis style.
The corexy appeals to me because it is less complex, require less pulleys and smooth rods. Anything else I’m getting myself into that I don’t know about?
@Eugene_Lee I liked the corexy a lot too for simplicity. But after running the Eustathios I like how many prints I have made with zero adjustment to the mechanics.
I think if I redesigned my corexy now I could do much better than my older designs. For example making sure no drive forces of the belts are cantelivered, but instead in perfect alignment with the guide rods/rails. Also design in a simple belts tension balancing system. Look at what @Daniel_F is doing. He made some nice design choices.
One nice thing is my corexy gantry plate is 100 percent modular. I can unclip two motor wire harnesses and 6 bolts and it removes as 1 piece. So it will still be around… Just not in use ultil I can give it more thought.