I certainly plan on having a 0.6 mm nozzle handy. I'm not quite sure how well it will feed off of 1.75 mm filament.
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Did some indirect digging on Marlin and the Wantai stepper drivers. It appears that the current version of Marlin puts out 3 us step pulses. The controller should be happy with 1.5 us, so there's some margin. The controller wants the direction or enable to be changed 5 us ahead of a step command. From looking at the code, I doubt that will be a problem. It's a single added line of code if it is. If we enable end stops, that adds more delay on direction changes, we are certainly safe then. The max step rate is 80KHz in this version. It's not clear if it can get there and still do anything else (like accept new comands ...).
That's all for the main body of code. I would not recomend playing with the "babystepping" option unless it gets checked out a bit more than I had time for.
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Did some indirect digging on Marlin and the Wantai stepper drivers. It appears that the current version of Marlin puts out 3 us step pulses. The controller should be happy with 1.5 us, so there's some margin. The controller wants the direction or enable to be changed 5 us ahead of a step command. From looking at the code, I doubt that will be a problem. It's a single added line of code if it is. If we enable end stops, that adds more delay on direction changes, we are certainly safe then. The max step rate is 80KHz in this version. It's not clear if it can get there and still do anything else (like accept new comands ...).
That's all for the main body of code. I would not recomend playing with the "babystepping" option unless it gets checked out a bit more than I had time for.