Tool offset to center print

JamesM

I'm trying to improve my Taz6 printer and after doing some bed leveling I did a 270 x 270mm rectangle print to see how the mesh leveling was working. What I noticed is that it's not printing centered on the bed.

What is weird is when I home the printer the nozzle does seem to be centered on the bed.

The first thing I checked was to make sure there were no offsets set up in my slicer (simplify3d) but everything is zero in there.

So...my question is would i use the G10 command to adjust this to center the print?

I have set the axis minimum and max I believe set correctly by homing each axis and measuring the distance the nozzle is from the corresponding edge of the bed for the minimums. This has given me these values

; Axis Limits
M208 X-9 Y0 Z0 S1 ; Set axis minima
M208 X300 Y300 Z250 S0 ; Set axis maxima

What I measured is the rectangle is 5.2mm from the left edge of the bed, 24mm from the right edge, 8.5mm from the bottom and 20.5mm from the top.

EDIT: I know it looks weird but I have a silicone baking mat between the bed heater and the PEI coated glass...the silicone has woven fiberglass in it...LOL. It was one my wife had that she isn't using so I confiscated it for the printer to help transfer the heat to the glass.

kazolar

you adjust your min and max, you have them incorrect for the bed geometry -- keep adjusting them until your center is actually center. G10 is for doing a nozzle offset, which only makes sense for a 2+ extruder machine

JamesM

It just doesn't make sense that when I homeall which is set to do the final z homing at 150,150 the nozzle lands right in the center of the bed. That's why I'm stumped.

It's a 300x300 bed and I re-checked where the nozzle lands when I home x and y and my min values are correct.

kazolar

Then do you have the slicer defined as 300x300 bed -- and it's centered.
I'd check the sliced gcode

JamesM

@kazolar Ya know...you may be onto something...I set it as 280x280 in simplify so it wouldn't go to the edges....I'll have to check that Monday since I'm away this weekend starting mid-day tomorrow.

dc42

@jamesm said in Tool offset to center print:

@kazolar Ya know...you may be onto something...I set it as 280x280 in simplify so it wouldn't go to the edges....I'll have to check that Monday since I'm away this weekend starting mid-day tomorrow.

I always set the bed centre to be X0 Y0, and the slicer to centre the print on X0 Y0, so that I don't need to worry about how large the bed is when centering the print in the slicer.

JamesM

@dc42

If I was to do it how you suggested making 0,0 the bed center, would I then change my x and y minimum and maximum setting in my config?

Change from this
M208 X-9 Y0 Z0 S1 ; Set axis minima
M208 X300 Y300 Z250 S0 ; Set axis maxima

to this
M208 X-159 y-150 Z0 S1
M208 X150 Y150 Z 250