Unresolved Negative values on Z ehile printing

is this normal??? I am getting negative values while printing a file been the bigger -0.91.
The result is that the first layers are missed.
Any idea about how to fix it?

I already used rhe auto level feature of Simplify a coupke of times

 

Is it causing print issues?

 

Yes, the extruder slides from side to side touching the bed so the first layers are missed, once it start getting to positive values the rest of the file prints ok

 

Did you configure the auto level with the paper test setting?
That Z setting is high enough that the nozzle shouldn't be dragging.
Check the G start codes. Your have to check with others for this.
Frank

 

yes I did the autolevel with the paper.
About the G code, I have no clue about what to look for so I am pretty lost

 

Anyone?

 

OK, here you go: Select settings, then printer, then custom G-code.
Now scroll down to M565
This setting should be between Z-0 & Z-1.1 The setting depends on the Z stop switches in your printer.
Run the test cube for 3 layers, then cancel it. check the bottom layer. It should be smooth and glazed if it is right, and the nozzle should not have dragged on top of the 3rd layer. The larger the Z#, the higher the nozzle travels.
Caution only adjust app. .1 at a time. Hope this helps, Frank


When you have it set up right, test it out with one of these. LOL

 

Thanx.
Will check as soons as I get home and post results

 

Looks like it is working!!! Thank you very much!!!!
I printed a couple pf small files and everything was fine, so I started an "almost lifesize" Terminator T800 and and, after 19 hours of printing this was the result.
Any idea about what can cause this? (Nobody was home so I am sure nobody touched the printer)

 

Below the cheeks, it appears the problem is no support.
Above the eyes, something shifted. Either the print moved or something slipped depending on how it was posed.
19 hours? how much fill did you use? Frank

Well Waldo, you might be right about it effecting only the first layer, but then again, I have eliminated nozzle dragging with this code above the 4th layer. Sometimes theory does not follow practice. A physicists at Westinghouse once told me this. Frank

 

Fill was 20 %. And, since there was no one home (and I have no cats, LOL) nobody touched/moved the printer.
Going to try to print an smaller version to check if the file is corrupt

 

I assumed that since Z offset, in effect, sets the basis of the height for the first layer, that basis is carried on on further layers. If not what sets that basis for the following layers. They have to start from something!
It's sounds like you are trying to tell me that the 2nd layer starts at the same height no matter how high or low the first layer is. I can see a gap in this logic. Frank

 

I understand that the Z offset is actually the actuation/deactuation time difference induced by the Z switches and that this factor is only applied once to the first layer. The following layer heights are defined as you have selected, but there starting point is always on the first layer and the thickness of this first layer has a certain effect on the 'sink rate' of the second layer. The following layers should be close to identical. Hay you guys know the code numbers, But I usually look at the 'mechanical' reaction that is taking place do to those code numbers. Just 2 different points of view I guess.Frank
PS: Hay! I looked at the full G code listing. That is a lot of numbers. And I use to have fun with the truth tables in early IC design projects.

 

I will let you go now Waldo. You just hit overtime. LOL Frank