Z height strange behaviour

[DeltaCon]

I am trying to calibrate my V2 following this guide: http://forum.seemecnc.com/viewtopic.php?f=36&t=9605.
While having made a few short scripts in MatterControl to send the hotend to specific positions and dial in manualy, I noticed that when I enter the gcode "g1 z2" to move to 2mm above the buildplate, it actually moves to Z2.96. While scratching my head about this, I tried other values, and the Z+0.96 is consistent and continuous: it ALWAYS does that... I tried the same in Repetier but there is goes without the strangely added 0.96. Anyone has a clue? It is not really a problem, but I want my printer to do as told!

[KAS]

It appears you have the overall Z-height set to .96mm

You should be able to adjust that height via the LCD and a piece of paper or feeler gauges.

When you issue G28 G0 Z0 F1000, it will go to the maximum z-height listed in your EEPROM/Config. So if you have your max height set to 20mm above they bed, G28 G0 Z10 F1000 will actually go to +30mm off the bed.



Some controllers will allow negative numbers although I'd advise against doing it.

[DeltaCon]

Thanks KAS,
I am aware of the Z height calibration. I just performed one, and after moving to a z of 2 the display still shows a Z of 2.96.
Also if I look back the commands that come from the macro in the terminal, I see that the z value there already has been changed into 2.96.
When I use the gcode through Repetiers Host all is just fine, so there must be some Z offset setting in MatterControl I think.
So... Mattercontrol must be translating that value somehow...

[KAS]

I gotcha, was hoping it was something easy Now we get to hunt and peck.


Do you have anything in your slice settings under Printer/Print Area, Size and Coordinates: Z offset ?

"Z Offset: This value will be added to all of the z positions of the created gcode."

[DeltaCon]

I found a setting called Z-offset under settings - printer - print area (MatterControl), is that what you mean?
It's set to zero however...