Prusa i3 layer shifting/drifting/tilted print

Hello!

I have been building a boxed frame Prusa i3. The thing is my prints are getting shifted in X axis and sometimes (rare) in Y axis.
I'm using Marlin and RAMPS 1.4 with standard nema 17 engines. A 430 ATX PSU connected so there should not be any issues with low amps.

Things I've tried:
Turn down Max acceleration
Adjust printing speed
Heatsink+powerful 120mm fan on the RAMPS
Belt X and Z belt is very tight, does not skip. You could play a tune on it.
Using pronterface to move the axises manually does not cause any stuttering or jagged movement

This is my first printer and I have never tried anything like this, so I might have missed stuff. Please help!

FYI this is inconsistent. I tried printing a small lego and it does not shift on the first few layers. Then I tried to print an adjustable X belt tensioner and it shifted a lot.

Thanks in advance!

Post your config file so we can take a look.

Have you slowed down the jerk speed as well?

Make sure the belts aren't too tight.



I had shifting problems, and it was the jerk/acceleration settings.

[saemundsson.se]
[saemundsson.se]
[saemundsson.se]

//// MOVEMENT SETTINGS
#define NUM_AXIS 4 // The axis order in all axis related arrays is X, Y, Z, E
#define HOMING_FEEDRATE {50*60, 50*60, 2*60, 0} // set the homing speeds (mm/min)

// default settings

#define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,3400,340} // reprap with mxl by danithebest91
#define DEFAULT_MAX_FEEDRATE {500, 500, 2, 45} // (mm/sec)
#define DEFAULT_MAX_ACCELERATION {900,900,10,1000} // 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 300//3000 // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 300//3000 // X, Y, Z and E max acceleration in mm/s^2 for r retracts

// Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
// The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
// For the other hotends it is their distance from the extruder 0 hotend.
// #define EXTRUDER_OFFSET_X {0.0, 20.00} // (in mm) for each extruder, offset of the hotend on the X axis
// #define EXTRUDER_OFFSET_Y {0.0, 5.00} // (in mm) for each extruder, offset of the hotend on the Y axis

// The speed change that does not require acceleration (i.e. the software might assume it can be done instanteneously)
#define DEFAULT_XYJERK 20.0 // (mm/sec)
#define DEFAULT_ZJERK 0.4 // (mm/sec)
#define DEFAULT_EJERK 5.0 // (mm/sec)

Still have not solved this.

I've gone as low as
#define DEFAULT_MAX_ACCELERATION {50,50,10,200}
#define DEFAULT_ACCELERATION 100
#define DEFAULT_RETRACT_ACCELERATION 100

and Jerk settings down to 0 and then up again but still nothing.

Anyone might know what I'm missing? I'm really scratching my head here :/
I'm not sure what info to provide but just ask if anything in specific is needed!

Did you by chance adjust the POT on the board? I had to do that to mine as I was getting shifting also. Just a thought.

Hey there,

Did anyone solved this problem? I am encountering the same problem with shifting layers. There seems to be no real pattern in where the shifting will occure but it is mostly in the x direction.

I tried adjusting the current on the drivers --> didnt help

Also lowered the jerk settings --> did not help

Tried most things explained here (http://reprap.org/wiki/Shifted_layers) and running low on ideas

Please Help! Its realy frustrating because the first layer is printed so nicely...

thanks in advance!