Gcode help

[Mjolinor]

I am convinced that my Duplicator 3 (ReplicatorG) is spending too long in once place without allowing the extrusion directly under the head to cool enough before it sticks the next layer on if the item it is printing is small, 20x20mm or so, always under the head.

To see if this is so I am sticking this between each layer

G91 Go to relative mode
G1 Z10 Drop Z 10 mm
G90 Go to absolute mode
G28 X0 Y0 Take the head home
G4 P4000 Wait 4 seconds

Here it is inline:

G1 X-20.88 Y1.2 Z0.41 F3510.097 E23.885
G1 F1200.0
G1 E22.885
G1 F3510.097
M103


G91
G1 Z10
G90
G28 X0 Y0
G4 P4000

(</infill>)
(</nestedRing>)
(</rotation>)
;M108 R29.04
(</layer>)
(<operatingLayerEnd> </operatingLayerEnd>)
(<layer> 0.675 )
(<rotation> (6.12323399574e-17+1j) )
(<nestedRing>)
M73 P10 (display progress)
(<boundaryPerimeter>)
(<boundaryPoint> X-30.0 Y0.0 Z0.675 </boundaryPoint>)
(<boundaryPoint> X-20.0 Y0.0 Z0.675 </boundaryPoint>)
(<boundaryPoint> X-20.0 Y10.0 Z0.675 </boundaryPoint>)
(<boundaryPoint> X-30.0 Y10.0 Z0.675 </boundaryPoint>)
(<edge> outer )
G1 X-29.62 Y0.2 Z0.68 F9000.0

The problem here is that after the pause Y is 60 mm or so too far forward. It seems as though HomeY is different before the pause from the value after the pause. The reprap gcode reference isn't helping, I think that the G28 is doing more than just taking the axes home though the reference doesn't say that it does.

Any knowledgeable person can shed some light on this?

[Mjolinor]

Well this is stupid. If I tell it:
G1 X0 Y0

Then it goes to the centre of the table so the home limit switches must be set to 0 + "some offset". I can't really understand what's going on and why it only affects the Y axis, not the X axis.

[Roxy]

Well this is stupid. If I tell it:
G1 X0 Y0

Then it goes to the centre of the table so the home limit switches must be set to 0 + "some offset". I can't really understand what's going on and why it only affects the Y axis, not the X axis.

Posting your Configuration.h file would be helpful.

[Mjolinor]

Posting your Configuration.h file would be helpful.

I don't have a configuration.h file. It is a Duplicator3, I have no idea what firmware is on it other than it is 1.0 or what firmware I can put on it. I tried Sailfish but it will not connect to the serial port. It does say "offsets depricated in firmware: 7.2" when I connect to it so maybe it has version 7.2 firmware even though the printer says version 1.0 or maybe 1.0 refers to the hardware version.

Having 0 info and being able to find 0 info makes it sort of hit and miss.

[3DPBuser]

It's a Wanhao, yes? There is a forum for it.