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Corner blobing

Posted by calad 
Corner blobing
January 28, 2015 05:28AM

I have a problem: corners are a bit expanded.

This is a huge problem because extra filament in corners. When I try to print objects that have 45 degrees angles on every layer they gain a bit more material thus causing corner lifting. This does not happend on flat corners.

I suspect reason may be in acceleration settings. For some reason x/y axis slows down in corner but extruder does not causing extra material there. Im using PLA with 180 degrees so temperature is not an issue. Firmware is marlin and I have this problem with cura and slicer.

// default settings

#define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,3200/0.8,479} // default steps per unit for ultimaker
#define DEFAULT_MAX_FEEDRATE {300, 300, 3.2, 45} // (mm/sec)
#define DEFAULT_MAX_ACCELERATION {1000,1000,10,45} // 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 1000 // 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 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)

All help is appreciated.
Re: Corner blobing
January 30, 2015 10:14AM
Why isnt temperature the problem? If i print at 180 degrees there is no way I get good results. Most of the time its 200 for me.

Settings look fine by me, almost identical to mine.

What happens when you slow down your whole print?
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