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Help with acceleration settings

Posted by eried 
Help with acceleration settings
September 29, 2015 12:11AM
Hello!

I am having some issues configuring my prusa (hictop kit). Can anyone recommend me some values to start playing with:
#define HOMING_FEEDRATE {50*60, 50*60, 4*60, 0}  // set the homing speeds (mm/min)

// default settings

#define DEFAULT_AXIS_STEPS_PER_UNIT   {80,80,2560,94.4962144}  // default steps per unit for Ultimaker 78.7402,78.7402,200.0*8/3,760*1.1}
#define DEFAULT_MAX_FEEDRATE          {500, 500, 5, 25}    // (mm/sec)
#define DEFAULT_MAX_ACCELERATION      {9000,9000,100,10000}    // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for Skeinforge 40+, for older versions raise them a lot.

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

#define DEFAULT_XYJERK                20.0    // (mm/sec)
#define DEFAULT_ZJERK                 0.4     // (mm/sec)
#define DEFAULT_EJERK                 5.0    // (mm/sec)

Maybe share their optimal values? thanks a lot!
Re: Help with acceleration settings
September 29, 2015 06:10AM
// default settings

#define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,4000,710} // default steps per unit for MINE
#define DEFAULT_MAX_FEEDRATE {200, 200, 3, 45} // (mm/sec) [I changed from 400 to 200]
#define DEFAULT_MAX_ACCELERATION {3000,3000,50,5000} // X, Y, Z, E maximum start speed for accelerated moves. E default values are good for Skeinforge 40+, for older versions raise them a lot. [I changed from 5000 from 3000]

#define DEFAULT_ACCELERATION 3000 // X, Y, Z and E acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 3000 // E acceleration in mm/s^2 for retracts
#define DEFAULT_TRAVEL_ACCELERATION 3000 // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves

// The speed change that does not require acceleration (i.e. the software might assume it can be done instantaneously)
#define DEFAULT_XYJERK 15.0 // (mm/sec) [I changed from 20 to 15]
#define DEFAULT_ZJERK 0.4 // (mm/sec)
#define DEFAULT_EJERK 5.0 // (mm/sec)
Re: Help with acceleration settings
September 29, 2015 11:16AM
Thanks RRuser, what kind of quality you get with these settings? (do you have any online photo of your printer/prints?)

I am getting very crap prints, constant step skips, jitter from the prusa. My 4 year old makerbot TOM get very nice prints with slow 30 mm/s (with sailfish previous firmware/ when it was called jetty firmware... newer 'accelerated' firmware messes that one too)
Re: Help with acceleration settings
October 01, 2015 09:18AM
I think the results are great. I'll be posting more here:
[forums.reprap.org]

Have you adjusted your stepper drivers?
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