bdring wrote:I have found that rounding a sharp corner can keep the speed up on a print and give a better quality edge. The rounding is actually a lot of little line segments. It appears that if you get too many short lines in the given space the controller starts to stutter a bit on those areas. It probably has something to do with the look ahead count.
bdring wrote:I still have troubles on my machine with the jerk on really short moves. The classic is the stepover from one perimeter to the next. It is a quick one filament wide move. It sounds like a thump, and I often loose steps during the print in Y. I have tried all sorts of settings. Last night I moved back to Marlin and it appears to have gone away.
bdring wrote:I still have troubles on my machine with the jerk on really short moves. The classic is the stepover from one perimeter to the next. It is a quick one filament wide move. It sounds like a thump, and I often loose steps during the print in Y. I have tried all sorts of settings. Last night I moved back to Marlin and it appears to have gone away.
It only happens with my Y axis. That uses a 400 step motor which is 157.48 steps per millimeter. That might be relates to the problem. I don't want to rewire the motor, so I may drop it via microstepping to 39.37 steps per millimeter (quarter step vs. sixteenth step). The other motors are all 200 step/rev.
bdring wrote:I still have troubles on my machine with the jerk on really short moves. The classic is the stepover from one perimeter to the next. It is a quick one filament wide move. It sounds like a thump, and I often loose steps during the print in Y. I have tried all sorts of settings. Last night I moved back to Marlin and it appears to have gone away.
bdring wrote:It only happens with my Y axis. That uses a 400 step motor which is 157.48 steps per millimeter. That might be relates to the problem. I don't want to rewire the motor, so I may drop it via microstepping to 39.37 steps per millimeter (quarter step vs. sixteenth step). The other motors are all 200 step/rev.
bdring wrote:At some point the step rate exceeds the interrupt rate so the highest step rate motor would see the problem first.
Just to split hairs, hybrid steppers can only skip in multiples of four whole steps.kbob wrote:The motor can only skip in whole steps
The firmware is, or at least should be, smart enough not to try to move faster than the interrupt rate. And for a short move, it won't have room to accelerate more than very little above the jerk number anyway.bdring wrote:At some point the step rate exceeds the interrupt rate so the highest step rate motor would see the problem first.
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