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bad print (4)

Posted by rui.o.pereira 
bad print (4)
January 08, 2016 12:48PM
Hi there,

I need help. (Please..) confused smiley

I want to print a "four" (4) , (like in the cura.png) but comes out something like this: (4.jpg) .

(seems like the layers don't stay aligned)

I new to this.

Does anybody can give a heads up?

(Is there any setting, that i need to change in Cura? )

Th prusa i3 hephestos is using marlin v1.3.1.

I already change the hot End.

I also leveled the plate.

I tryed to print by USB (with PC) and also saving the Gcode to an SD card.

I'm outta ideas... sad smiley

Regards, and thank's in advance.
Rui Pereira

Edited 1 time(s). Last edit at 01/08/2016 12:53PM by rui.o.pereira.
open | download - cura.png (113.4 KB)
open | download - bad_4.jpg (185.9 KB)
Re: bad print (4)
January 08, 2016 03:00PM

This has nothing to do with Cura. The y-motor is missing steps.
Lower the speed in marlin.

Here is an example:

#define DEFAULT_AXIS_STEPS_PER_UNIT {80.00,80.00,3200/0.8,400} // default steps per unit for Ultimaker
#define DEFAULT_MAX_FEEDRATE {200, 200, 2, 45} // (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

// 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 instantaneously)
#define DEFAULT_XYJERK 5.0 // (mm/sec)
#define DEFAULT_ZJERK 0.4 // (mm/sec)
#define DEFAULT_EJERK 5.0 // (mm/sec)
Re: bad print (4)
January 08, 2016 10:30PM
Try increasing your step stick current by turning the little flat screw there, but do be careful on turning them as it is quite sensitive even if it's just 1 degree turn would mean about 100mV value difference, then check your step stick and motor's temperature by touching them, let it run at max of warm temperature
Re: bad print (4)
January 09, 2016 02:45AM
Had the same happen on my printer, turned out that I did not have the y axis pulls tightened enough and the pulley was slipping on the stepper shaft.

Mark the shaft and the pulley with a marker pen and see if the pulley is slipping.
Re: bad print (4)
January 12, 2016 06:12PM
ok, guys,

I'm gonna try this, because i didn't change nothing in the marlin...and a couple of month ago , it was printing just fine..Maybe it has some slack...i guess,

It's a BQ prusa i3 hephestos.

Thank's very much. for the heads up.

Edited 2 time(s). Last edit at 01/13/2016 04:24AM by rui.o.pereira.
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