printing pattern

So I have to print two layers for research purposes.
i have a sheet drawn on AutoCAD then imported to Slic3r twice and were placed on top of each other.
The problem im having is that when the Reprap finishes the first layer (1st sheet) it starts printing the second layer where it left off with the first one.
I need the second layer to start at the same coordinate as the first one.

Attached both the drawing and the g-code.
Any help is much appreciated

I'm not sure I understand what you're trying to accomplish.

You want the two sheets on top of each other with a space between them in the z axis? You can use the move tool and manually set the z height (I'm using repetier host so it could be slightly different in slic3r host). Or you can design the object with two sheets in auto cad with the space between them you need/want.

Or do you want one inside the other, basically printing the sheet twice at the same location, which will likely mash them together in a big mess. You could copy the gcode (after the startup gcode and before the end gcode) and paste it before the end code. The slicer usually uses absolute positioning so it should be printing the same object twice on exactly the same coordinates (if there's no steps skipped that is).

Not quite,

So i want two sheets one printed on top of the other. Lets assume that the length of the sheet is (x=2) and width (y=1).
What I have now is the the print would start at (0,0) for the first sheet and works its way to (2,1) where it finishes the first sheet.
Then it would start the second sheet from (2,1) and come back to (0,0) but what i really want it t do is to start at (0,0) as well for the second sheet.
I want the start and finish point to be the same for both sheets.

You could make an object double the thickness of the printed layer height. The slicer will create two layers for you.

didn't work. Also need both layers to be printed on a 180 degrees orientation. with thickness 0.2 mm each.
appreciate you trying to help.

I'm still baffled what you're trying to do. 180 degree orientation? That's upside down. That has zero effect on a flat rectangular object.
Set layer height to 0.2 mm and design the object with a height of 0.4mm. Slice it and you got 2 layers.

So by saying 180 i mean both layers to be printed in the same orientation. meaning the angle is zero relative to each other.
I need identical layers same orientation same print path.

when i drew a 0.4 mm thick rectangle and opened it in Slic3r chose a 0.2 mm layer thickness, each layer was printed in a 90 degrees relative to each other. by that i mean 1st layer printed left to right and the second one printed top to bottom print head motion,

I dont know if I am making myself hard to understand, trying my best to explain it haha
did you take a look at the G-code attached? or tried to print it?

Just take the first layer of gcode and copy and paste it with just a different z dimension.
If you set the first layer to .2mm then copy the whole section for that layer and then just chage the next layer to .4mm. Same movements just .2mm higher...

Try the attached code.

Edited 1 time(s). Last edit at 09/21/2015 04:00PM by Floyd.

Ok I understand now, floyds solution should work. Maybe concentric infill will also work, or setting perimeters very high so there's no infill.

Floyd...
dont have access to printer today, will try tomorrow and let you know. Just have to figure how to change the Z dimension.
keep you posted. thanks

Floyd,

Tried the attached code but it printed the same way. Second layer didn't start where the first layer did.
any other approach?

It should have... Here are the first few lines of the two layers. They are exactly the same.

G1 Z0.200 F7800.000
G1 X24.362 Y56.860 F7800.000
G1 E1.00000 F1800.000
G1 X27.500 Y56.041 E1.11364 F1200.000
G1 X112.500 Y56.041 E4.09243
G1 X114.723 Y56.438 E4.17155
G1 X116.670 Y57.580 E4.25067
G1 X118.103 Y59.325 E4.32979
G1 X118.921 Y62.463 E4.44344

G1 Z0.400 F7800.000
G1 X24.362 Y56.860 F7800.000
G1 E1.00000 F1800.000
G1 X27.500 Y56.041 E1.11364 F1200.000
G1 X112.500 Y56.041 E4.09243
G1 X114.723 Y56.438 E4.17155
G1 X116.670 Y57.580 E4.25067
G1 X118.103 Y59.325 E4.32979
G1 X118.921 Y62.463 E4.44344

I actually went ahead and let the print complete this time. So it basically printed 4 layers total.
First one laid down then the second started where the first ended then third & 4th were a repeat for the first two.

I wonder if we can make the second a repeat for the first.