the question is more which of these jerks is so low that it causes it to get the cause of slowdowns and which slowdowns are ok as you are in deed changing directions preventing full speed.
Yes, it will slowdown in the corners depending on angle and jerk and then do the next move. But you have in your triangle always acceleration and deceleration at the end. Should still look smooth and give no ripples except for vibration and positioning inaccuracy.
Since you have single walled print can you say if they come from extrusion fluctuations which means the width would vary with the pattern you see or is it offset from precise position.
just to chime in, I seem to have a related (?) issue here: I usually throttle down the print-speed for the first few layers (depending on the print, typically the first three) to 70% and then speed up to 85% for about a minute and then finally to 100% or higher.
If X and Y are involved in a print-movement (infill, part rotated 45 degrees) AND the printer runs with <100% speed I see stalls during printing a straight line, about every ~5mm or so... _ = ~5mm . = stall for about 0.2-0.4 sec __._.__._.__. <- looks like my printer is trying to tell me something ("let me outta here" :-D) as soon as I ramp up to 100% the stalls are gone....*huh*
Firmware: Repetier 0.92.9, printing via RepetierServer 0.80.2 on a rasPi3, RAMPS 1.4
Print speed set in cura: 30/26/30 (Speed / outer / infill), the stalls left out the print comes out very smooth.
Firmware does for cartesian lines not stop on straight lines. For deltas and with active distortion map these lines get split and could at least theoretically slow down. Especially on the limited AVR with 16kb ram and limited speed the ram usage and speed could get a problem specially if the resolutionis high (steps per mm). Does anything match for you?
Comments
I usually throttle down the print-speed for the first few layers (depending on the print, typically the first three) to 70% and then speed up to 85% for about a minute and then finally to 100% or higher.
If X and Y are involved in a print-movement (infill, part rotated 45 degrees) AND the printer runs with <100% speed I see stalls during printing a straight line, about every ~5mm or so...
_ = ~5mm
. = stall for about 0.2-0.4 sec
__._.__._.__. <- looks like my printer is trying to tell me something ("let me outta here" :-D)
as soon as I ramp up to 100% the stalls are gone....*huh*
Firmware: Repetier 0.92.9, printing via RepetierServer 0.80.2 on a rasPi3, RAMPS 1.4
Print speed set in cura: 30/26/30 (Speed / outer / infill), the stalls left out the print comes out very smooth.
#define MAX_ACCELERATION_UNITS_PER_SQ_SECOND_X 1000
#define MAX_ACCELERATION_UNITS_PER_SQ_SECOND_Y 1000
#define MAX_ACCELERATION_UNITS_PER_SQ_SECOND_Z 100
..
#define MAX_TRAVEL_ACCELERATION_UNITS_PER_SQ_SECOND_X 1000
#define MAX_TRAVEL_ACCELERATION_UNITS_PER_SQ_SECOND_Y 1000
#define MAX_TRAVEL_ACCELERATION_UNITS_PER_SQ_SECOND_Z 100
any idea?