XY Jerk settings I often see suggestions to change the XY Jerk for printing issues, corners mostly. but I was wondering about what is the recommended Max setting for this? The github version of Marlin is set at 20, I have seen people say they set it as high as 400?? ( I know..I know.. it is based on printer model ) What is the effect of a high setting or too high setting? https://reprap.org/forum/read.php?262,357898,357898#msg-357898 Fri, 11 Sep 2026 16:10:30 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?262,357898,369757#msg-369757 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,369757#msg-369757
My professor briefly touched on jerk in my college advanced machine design course 15 years ago. I don't use kinematics professionally so I've forgotten how to apply jerk math to a machine.]]> umdpru Printing Sat, 14 Jun 2014 09:11:44 -0400 https://reprap.org/forum/read.php?262,357898,358769#msg-358769 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,358769#msg-358769 chris33 Printing Wed, 21 May 2014 22:30:37 -0400 https://reprap.org/forum/read.php?262,357898,358676#msg-358676 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,358676#msg-358676
Quote
chris33
heres a another thread about xy jerk settings bumpy around corners

I saw that one, kinda why I asked.
If I understand correctly on a change in direction ..say x to y.. when it shifts direction this slowly raises the acceleration to you set rate. Or is this the speed that the change takes place?

I will just have to play with the setting more. I still am wondering what a max setting would be, high would be too high.]]> cat.farmer Printing Wed, 21 May 2014 17:25:42 -0400 https://reprap.org/forum/read.php?262,357898,358505#msg-358505 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,358505#msg-358505 bumpy around corners]]> chris33 Printing Wed, 21 May 2014 12:38:32 -0400 https://reprap.org/forum/read.php?262,357898,358266#msg-358266 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,358266#msg-358266 chris33 Printing Wed, 21 May 2014 02:55:28 -0400 https://reprap.org/forum/read.php?262,357898,358249#msg-358249 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,358249#msg-358249
Quote
Andrew Smith
Acceleration, here, means ramping the motors to the desired speed rather than asking them to change speed within a single step.

Yes, the motors themselves can probably handle instantaneous changes in speed, but the printed object might suffer as a result. Thus, the firmware uses logic to change the speed of the motor over time until it reaches the desired speed (or the point at which it needs to start decelerating).

I'm not sure of all of the math, but in my mind, I sort of equate jerk to how steep that acceleration curve can be.]]> jbernardis Printing Wed, 21 May 2014 00:52:25 -0400 https://reprap.org/forum/read.php?262,357898,358191#msg-358191 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,358191#msg-358191 Andrew Smith Printing Tue, 20 May 2014 19:56:33 -0400 https://reprap.org/forum/read.php?262,357898,358183#msg-358183 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,358183#msg-358183
Quote
MrDoctorDIV
So it's liken to acceleration, but for changes of direction, rather than speed alone?

That is what confuses me..the firmware states./ The speed change that does not require acceleration (i.e. the software might assume it can be done instanteneously)
How can you change speed without acceleration?]]> cat.farmer Printing Tue, 20 May 2014 19:36:34 -0400 https://reprap.org/forum/read.php?262,357898,358148#msg-358148 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,358148#msg-358148 MrDoctorDIV Printing Tue, 20 May 2014 17:31:31 -0400 https://reprap.org/forum/read.php?262,357898,358098#msg-358098 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,358098#msg-358098 chris33 Printing Tue, 20 May 2014 15:38:37 -0400 https://reprap.org/forum/read.php?262,357898,358075#msg-358075 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,358075#msg-358075 jbernardis Printing Tue, 20 May 2014 15:11:47 -0400 https://reprap.org/forum/read.php?262,357898,358047#msg-358047 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,358047#msg-358047 chris33 Printing Tue, 20 May 2014 14:30:56 -0400 https://reprap.org/forum/read.php?262,357898,357999#msg-357999 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,357999#msg-357999
]]> MrDoctorDIV Printing Tue, 20 May 2014 13:15:50 -0400 https://reprap.org/forum/read.php?262,357898,357965#msg-357965 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,357965#msg-357965 cat.farmer Printing Tue, 20 May 2014 12:03:30 -0400 https://reprap.org/forum/read.php?262,357898,357959#msg-357959 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,357959#msg-357959 Personally I think a lot of these initial firmware acceleration values in most firmware packages were meant to impress, display and showcase the speed capabilities of the machine/printer itself, and not necessarily turning the machine in to a workable 3d printer that produces reliable quality prints.
Print FAST (and with high firmware acceleration & jerk values) throw the print in the garbage when done, Print SLOWER (and with lower acceleration & jerk values), and you stand a chance a achieving a successful high quality print.

The below values work for my machine setup, which the chassis is designed to be both rigid and lightweight
and is constructed out of 6061-T6 Aluminum Plate, I designed my chassis and selected appropriate build materials
to counter any chassis flex during printing, accleration, jerk and reciprocating forces.

For spindly designed machines using M8 thread stock with printed plastic chassis connectors, wooden boxed chasiss,
and plastic printed chassis, that do not have the rigidity of a competent design and materials, you may need to further
reduce your Acceleration & Jerk Variables.

//=========================================================
//===========Acceleration & Jerk Variables=================
//=========================================================
//Marlin_v1.0.0 RC2 on Gen 6

// Feedrates & ACCELERATION
#define DEFAULT_MAX_FEEDRATE {500, 500, 5, 45} // (mm/sec)

// #define DEFAULT_MAX_ACCELERATION {9000,9000,100,10000}
// 032813_seems to accelerate to rapidly causing the stepper motor/or belt to skip a create a offset error ruinng the print. Reduce values.
#define DEFAULT_MAX_ACCELERATION {3500,3500,100,2000} // X, Y, Z, E maximum start speed for accelerated moves.

// #define DEFAULT_ACCELERATION 3000 // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_ACCELERATION 2000 // X, Y, Z and E max acceleration in mm/s^2 for printing moves.
#define DEFAULT_RETRACT_ACCELERATION 2000 // X, Y, Z and E max acceleration in mm/s^2 for retracts.

//
// #define DEFAULT_XYJERK 20.0 // (mm/sec)
// 040213_XY_changed to 15.0, to reduce vibration in small detail/thin walled prints, reduce any corner print quality issues and layer offset issues.
// 060113_XY_changed to 10.0, to reduce jerk in small detail/thin walled prints and reduce any layer offset shifting. FIXED offset layer issue !!!
#define DEFAULT_XYJERK 10.0 // (mm/sec)
#define DEFAULT_ZJERK 0.4 // (mm/sec)
#define DEFAULT_EJERK 5.0 // (mm/sec)
//===========================================================================

Your mileage may vary with the above settings, but it least it gives you an idea what others have been successful using.

Hope my experience helps you... enjoy Happy Printing !:)-D

Shawn
__________________________________________________________________________________________________________________

25+ Years Experience as a Manufacturing Engineer and New Product Developer
Three Years Experience... Printing 6-8 hours a day, 5 days a week, complex and close tolerance functional engineering prototypes.
Printing PLA @0.1mm Layer Height with +- 0.05mm tolerance for all dimensional shapes (except slightly undersized hole I.D.s).
No printing of... toys, trinkets, low quality prints, or other useless printed objects.
]]> ShawnT98027 Printing Tue, 20 May 2014 11:52:37 -0400 https://reprap.org/forum/read.php?262,357898,357920#msg-357920 Re: XY Jerk settings https://reprap.org/forum/read.php?262,357898,357920#msg-357920 MrDoctorDIV Printing Tue, 20 May 2014 10:44:58 -0400 https://reprap.org/forum/read.php?262,357898,357898#msg-357898 XY Jerk settings https://reprap.org/forum/read.php?262,357898,357898#msg-357898 The github version of Marlin is set at 20, I have seen people say they set it as high as 400?? ( I know..I know.. it is based on printer model )
What is the effect of a high setting or too high setting?]]> cat.farmer Printing Tue, 20 May 2014 09:52:39 -0400