Stuttering During Prints

RE: v.91 firmware

Some of my vase prints are stuttering (not moving smoothly). The vase prints have many short segments. The only thing that prevents this is slowing down the print to a very slow speed, which is something I have not experienced using Marlin.

Any suggestions to make things smoother and still print fast like on Marlin? I assume it has to do the settings below, but I am not clear what values to enter.

Thanks, Chris

This number of moves can be cached in advance. If you wan't to cache more, increase this. Especially on
many very short moves the cache may go empty. The minimum value is 5.
*/
#define MOVE_CACHE_SIZE 16

/** \brief Low filled cache size.

If the cache contains less then MOVE_CACHE_LOW segments, the time per segment is limited to LOW_TICKS_PER_MOVE clock cycles.
If a move would be shorter, the feedrate will be reduced. This should prevent buffer underflows. Set this to 0 if you
don't care about empty buffers during print.
*/
#define MOVE_CACHE_LOW 10
/** \brief Cycles per move, if move cache is low.

This value must be high enough, that the buffer has time to fill up. The problem only occurs at the beginning of a print or
if you are printing many very short segments at high speed. Higher delays here allow higher values in PATH_PLANNER_CHECK_SEGMENTS.
*/
#define LOW_TICKS_PER_MOVE 250000

Edited 1 time(s). Last edit at 01/01/2014 01:13PM by cts519chris.

Yes, many small segments are the biggest problem.

If it is not a delta printer you can increase buffer size to 32. Increase move cache low the 14-16 in that case.

Then increase LOW_TICKS_PER_MOVE until stuttering disappears.

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It may be a good idea to include those suggestions in the configuration.h or on a help page. The in-line information, to be honest, is not that helpful and would lead me to guess.

I will give your suggestions a try and will report back.

For sure, your firmware has much more depth and features than Marlin.

Many thanks! Chris