Quote
karabas
If head path is very complicated and speed is high the gcode comand rate is too high and 250000(standart Ultimaker rate) is not enough. So native USB is a must. Yes?
I haven't had a single time where it wasn't enough. By the way, APrinter supports SD card printing (in a limited way), and if you're printing anything larger you should be using that. That is not to say native USB will not come eventually, but it's not a priority.
Also, if anyone really is hitting the limit with the serial, designing a more efficient protocol is an alternative solution. I'm pretty sure we can get at least 2x more out of the serial port, with efficient binary encoding and not waiting for an 'ok' for every single command. And the thing is, this would not only help serial printing on this particular board, but it would help serial printing on all boards with this firmware (or others if they implement it), and potentially also SD printing, if the protocol has a "stored" version.
Note that I am willing to improve APrinter in different ways, but I need concrete data that something really needs improvement (and see it for myself ;) ), or I might end up wasting my time. So, anyone who can, please do test.