Speed It Up
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I’m running UNO/AMSv2 w/the Marginally Clever 400 step Nema 17’s and 36 tooth pulleys. Everything is tuned in and getting great prints.
I’ve been playing with Max Feed Rate setting in the Pen tab and finding this number is not effecting the speed much (if at all). Is there something that can be done to get things moving much faster?
I already uncommented the TWBR line in the firmware –>
//TWBR = ((F_CPU /400000l) – 16) / 2;Is the only way to get more speed out of this setup by getting rid of some micro stepping?
Has anyone else achieved a faster print speed while maintaining quality results that wouldn’t mind sharing their settings?
The maximum feed rate for AFMS boards is less than 1/3 the top speed of the RUMBA boards. That was a big part of why we made the v3.
The Arduino talk to the shield, which then sends stepper commands. To get straight lines it’s
Arduino > I2C language > shield > motor
every step. Converting to and from i2c is the bottleneck. The RUMBA is
RUMBA > motor
every step, and the speed it can talk at is faster (because the clock is faster).
There are ways to say “take N steps” instead of just one step, but then the code for AFMS becomes something different. I try to not break things that already work, so I haven’t explored this option.
I am eager to hear how anyone else has improved their top speed.
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