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jtaylor330

Prints Not Centered

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Posted · Prints Not Centered

Okay guys, I have looked across multiple videos and forums for a few days now and not been able to fix my issue. 

I know this is a topic covered in many places but I apparently am missing something and cannot get this working 

 

I built a new printer, standard Cartesian style XYZ. Running latest marlin firmware and latest CURA. 

All axis Home fine, printer dimensions are measured out at X202  Y326  Z254 and set to this in both Cura printer settings and Firmware dimension settings.

I notice on the LCD that once Homed it is not reading 0,0,0 Like I would expect and instead readying x-101 y-163.

I tried putting in the gcode settings in cura at start print to have it read G92 x0 y0 etc. but that did nothing. 

Also, when the print begins it homes, then moves directly to the bed center with Z15 respectively and then lowers down into the corner to start the print. 

 I added pic links to try and get my issue across, Green is bed center and red is where it is trying to print. Not sure what else details I can provide

but i cannot figure it out for some reason. I may be missing something completely obvious here and I apologize if I am. 

https://drive.google.com/open?id=1emGnmTUUlvSvsRoXiAtKLr9GuOlMgbka

https://drive.google.com/open?id=1Se3b3PkpCU1M6nP4cu3r-DQxZnBa26UT

--------------------------------------

CURA Code (last tested)

G28 ;Home

G1 Z15.0 F6000 ;Move the platform down 15mm

G92 X0 Y0 Z0

;Prime the extruder

G92 E0

G1 F200 E3

------------------------------------------------------------------------------------------

 

Marlin Code for dimension

// Direction of endstops when homing; 1=MAX, -1=MIN
// :[-1,1]
#define X_HOME_DIR -1
#define Y_HOME_DIR -1
#define Z_HOME_DIR -1

// @section machine

// The size of the print bed
#define X_BED_SIZE 202
#define Y_BED_SIZE 326

// Travel limits (mm) after homing, corresponding to endstop positions.
#define X_MIN_POS 0
#define Y_MIN_POS 0
#define Z_MIN_POS 0
#define X_MAX_POS X_BED_SIZE
#define Y_MAX_POS Y_BED_SIZE
#define Z_MAX_POS 254

 

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Posted · Prints Not Centered

Tonight I will sit down and run through a clean configuration of marlin. Right now it’s using the preconfig files for the anetA8 because that is what the print controller came off of and all I changed was the bed dimensions to reflect this new build. 

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Posted · Prints Not Centered
16 hours ago, tinkergnome said:

 

Sounds like a firmware configuration thingy....?

http://marlinfw.org/docs/configuration/configuration.html#homing-options

 

 

Okay you were correct...

I wasnt understanding what I was looking at in the code. 

By changing the X_MIN Y_MIN ;after Homing offset

to this:

#define X_MIN_POS -101
#define Y_MIN_POS -163
#define Z_MIN_POS 0

and ALSO using the CURA GCode addition of:

G92 X0 Y0 Z15

 

It is now printing dead center on the bed and I am running the first test print. Thanks man

 

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Posted · Prints Not Centered

Great - although... my suspicion was that you have accidentally activated "BED_CENTER_AT_0_0"

Take sure, that it is disabled for a cartesian printer - because 0/0 is the home and minimum position in your case - and not the center, right?

 

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Posted · Prints Not Centered

Correct , I did check and verify this was disabled. I ran a 15 hour print overnight that turned out really well so I think I can officially call this a completed project. Although that centering issue I spent several days trying to figure out. 

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