Print not centering on build plate Hello, I’m absolutely stymied and need some help. I’m not sure if this is a printer, firmware or slicer issue but I’ll post my problem here. The printer is a HyperCube CoreXY. RAMPS 1.4, Marlin 1.1.0-RC7 and g-code created with Slic3R. Pronterface is the host..The motors turn in the right direction and the axes all home as they should The problem is that the printer will not center the print on the bed. Every print start right at the home position, right at the front left hand side of the plate. While the printer is going through the motions it is triggering the X & Y end stops. The printers X & Y travel limits are X250 x Y230, My printable area is set at 200 x 200. The extruder tip homes about 5mm to the front and left side off of the printable area so I set the offsets (origin in the bed setup) in Slic3r to -25 & -25. Pronterface shows the print starting up and to the right. If I’m reading the G-code right it also has the extruder traveling up and to the right to the bed center. I even tried setting the Slic3r offset setting to positive numbers and that had no effect. All I’m trying to print is a 100mm cubejust to check the motions. I haven’t actually printed anything yet, Its a new build. I’ve read everything I could find but just can't seem find a solution. Any suggestions or help is greatly appreciated.! Ray [attachment 105156 Config_H.doc] [attachment 105157 G-code.txt] [attachment 105158 Pronterface.JPG] [attachment 105159 Slic3r.JPG] [attachment 105160 homed_nozzle.jpg] https://reprap.org/forum/read.php?397,823548,823548#msg-823548 Sun, 17 May 2026 01:02:21 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?397,823548,834193#msg-834193 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,834193#msg-834193 id86 CoreXY Machines Thu, 20 Sep 2018 12:07:15 -0400 https://reprap.org/forum/read.php?397,823548,834184#msg-834184 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,834184#msg-834184
Quote
the_digital_dentist
Of course, it assumes that the printer's mechanism is working properly...
Yes the problem is i don't think so, because when printing in the corner and hitting one of the endstops it tells position on pronterface and this differs slightly sometimes for ex. y coordinate is shown triggered endstop at 97.5 or on another try at 96.7. so the mechanismn isn't working probably.

But still thanks for the useful link]]> id86 CoreXY Machines Thu, 20 Sep 2018 10:20:19 -0400 https://reprap.org/forum/read.php?397,823548,834183#msg-834183 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,834183#msg-834183 another blog post about that type of set-up here. Of course, it assumes that the printer's mechanism is working properly...]]> the_digital_dentist CoreXY Machines Thu, 20 Sep 2018 09:41:06 -0400 https://reprap.org/forum/read.php?397,823548,834167#msg-834167 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,834167#msg-834167 id86 CoreXY Machines Thu, 20 Sep 2018 07:12:05 -0400 https://reprap.org/forum/read.php?397,823548,834160#msg-834160 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,834160#msg-834160
In my case all I had to do was increase the voltage to my X stepper. I turned the potentiometer a little and the printer started behaving normally. It seemed
odd that it worked great by just jogging the axes but not when it came time to do a print. I was a little embarrassed by not being able to figure it out for a couple days so I didn't post the fix to conclude this thread.]]> Shank man CoreXY Machines Thu, 20 Sep 2018 06:30:00 -0400 https://reprap.org/forum/read.php?397,823548,834138#msg-834138 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,834138#msg-834138 id86 CoreXY Machines Thu, 20 Sep 2018 01:03:12 -0400 https://reprap.org/forum/read.php?397,823548,824005#msg-824005 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,824005#msg-824005 The firmware didn't allow negative coords for XY too.
This might be the problem in your case: the nozzle is in the negative quadrant after homing and FW refuses to move it.
What are your bed limits in FW? In RRF it's the M208 S1 X### Y### Z### line.]]> o_lampe CoreXY Machines Thu, 31 May 2018 03:05:25 -0400 https://reprap.org/forum/read.php?397,823548,823986#msg-823986 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,823986#msg-823986 the_digital_dentist CoreXY Machines Wed, 30 May 2018 21:23:33 -0400 https://reprap.org/forum/read.php?397,823548,823982#msg-823982 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,823982#msg-823982
Quote
the_digital_dentist
Where is the bed located within that 230x250 mm space? The printer thinks of motion in its coordinate space, and the slicer has its own coordinate space shifted (usually) relative to the printer's coordinate space. The slicer's origin is always on the corner of the bed. The printer's origin may or may not be on the bed.

Take a look at this: [drmrehorst.blogspot.com] and this: [drmrehorst.blogspot.com]

Slic3r is usually pretty easy to set up, Cura a little harder because you have to use some custom gcode to tell it where the origin of the bed is located.

I should have titled my topic differently. I should have said " All prints start at the origin regardless of the Slicer settings."

I never had any problems getting the prints centered on the Prusa I2 & I3 style printers so I thought this might be a CoreXY issue. I printed
out your tech topics a few months ago, they are a tremendous help. Thank you for taking the time to write and post those.

All the motors are turning correctly, all limit switches are
connected to the minimum pins on the controller board.

the slicer generated g-code has the nozzle moving to X70 & Y70 to start the print


G28 ; home all axes


G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G92 E0
G1 E-1.00000 F1800.00000
G92 E0
G1 Z0.350 F7800.000
G1 X70.350 Y70.350 F7800.000
G1 E1.00000 F1800.00000
G1 X169.650 Y70.350 E10.02931 F378.000

Pronterface indicates the same when I load the file......

the print goes from 70.200000 mm to 169.800000 mm in X
and is 99.600000 mm wide

the print goes from 70.200000 mm to 169.800000 mm in Y
and is 99.600000 mm wide


but the prints always start right at the origin. the extreme lower left of the 3rd quadrant.

my next move is to try a different firmware version.]]> Shank man CoreXY Machines Wed, 30 May 2018 18:08:22 -0400 https://reprap.org/forum/read.php?397,823548,823718#msg-823718 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,823718#msg-823718 always on the corner of the bed. The printer's origin may or may not be on the bed.

Take a look at this: [drmrehorst.blogspot.com] and this: [drmrehorst.blogspot.com]

Slic3r is usually pretty easy to set up, Cura a little harder because you have to use some custom gcode to tell it where the origin of the bed is located.]]> the_digital_dentist CoreXY Machines Mon, 28 May 2018 12:59:31 -0400 https://reprap.org/forum/read.php?397,823548,823592#msg-823592 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,823592#msg-823592
Quote
o_lampe
You have to set the origin in Marlin and slic3r the same way. ( eg. bed center at 0,0 )
IMHO you have to set slic3r offset to +105,+105 and leave Marlin as_is.

BTW: You can disable autocenter parts in slic3rs preferences, just to get you printing. Just move the part to a position, your printer can actually print it.


Thank you for the suggestions, I tried both and still get the same results. The print continues to start at the home position regardless of where I place it in Slic3r.I tried Cura too and there is no difference so I'm guessing there are some settings in the firmware I'm missing.The firmware was preconfigured and included in the Thingiverse file with the printable part STL's. For now I changed the print area in Marlin and Slic3r to be the same and re-positioned my end stops so the nozzle homes over the print area. At least now the filament will land on the bed surface.]]> Shank man CoreXY Machines Sun, 27 May 2018 10:15:00 -0400 https://reprap.org/forum/read.php?397,823548,823570#msg-823570 Re: Print not centering on build plate https://reprap.org/forum/read.php?397,823548,823570#msg-823570 IMHO you have to set slic3r offset to +105,+105 and leave Marlin as_is.

BTW: You can disable autocenter parts in slic3rs preferences, just to get you printing. Just move the part to a position, your printer can actually print it.]]> o_lampe CoreXY Machines Sun, 27 May 2018 03:05:09 -0400 https://reprap.org/forum/read.php?397,823548,823548#msg-823548 Print not centering on build plate https://reprap.org/forum/read.php?397,823548,823548#msg-823548
The printers X & Y travel limits are X250 x Y230, My printable area is set at 200 x 200. The extruder tip homes about 5mm to the front and left side off of the printable area so I set the offsets (origin in the bed setup) in Slic3r to -25 & -25. Pronterface shows the print starting up and to the right. If I’m reading the G-code right it also has the extruder traveling up and to the right to the bed center. I even tried setting the Slic3r offset setting to positive numbers and that had no effect. All I’m trying to print is a 100mm cubejust to check the motions. I haven’t actually printed anything yet, Its a new build.

I’ve read everything I could find but just can't seem find a solution.

Any suggestions or help is greatly appreciated.!

Ray

[attachment 105156 Config_H.doc]

[attachment 105157 G-code.txt]

[attachment 105158 Pronterface.JPG]

[attachment 105159 Slic3r.JPG]

[attachment 105160 homed_nozzle.jpg]]]> Shank man CoreXY Machines Sat, 26 May 2018 16:39:29 -0400