Solved custom G code

Try this:

More negative (i.e. -0.9 rather than -0.6) is further from the bed.

 

No. Something else is going on. You must have a global offset or something defined elsewhere OR that GCode you posted is not your entire startup GCOde. it is important because the M565 must be AFTER the LAST G28 and before the ONLY G29. if you do the M565 and then do another G28 it is wiped out.

 

I mean in theory 0.9 mm might be too low, but it needs to at least be HIGHER from the bed than the 0.6 .. if not something else is going on.

 

But you see, in MatterControl (and even in other slicers) there are different configuration screens where you can do things like set a global Z offset. That would cause you grief. For example this:

http://wiki.mattercontrol.com/SETTINGS/Printer/Print_Leveling/Probe_Settings/Z_Offset

Should be zero. There are likely others. While you are at it open the GCode terminal (see the SHOW TERMINAL button):

http://wiki.mattercontrol.com/OPTIONS/G-Code_Terminal

and type in the the following:

M502;

and then

M500;

 

It is not a limit but seldom is the offset more negative. If the change from 0.6 to 0.9 is not noticable something else is going on. I have see printers with larger offsetsand maybe it needs it but there would still be improvement as it increases.

 

@Mr Wire Do not use the Z Offset in Matter Control. That is not what creates a proper Z Offset. Here is what that does exactly. Let's say you are slicing a model and you ask for all layers to be 0.2 mm, but you need an offset so let's say for example you put in 1.0 mm in that box. what it will do is take you 0.2 mm and add your offset so that the result is the printer will use 1.2 mm as layer one. It doesn't care about level it is just a value that is added to layer one. MatterControl does it this way as they are a generic multi-printer host application that must work with many different types of firmware and this is one way to guarantee that some sort of offset works with all those flavors of 3D printers.

 

Not really, it needs whatever thickness (and it will be custom to each printer) it takes to get a good first layer.
The picture we always refer to for what THAT perfect first layer looks like is here (again):

https://printedsolid.com/blogs/news/37035715-get-your-prints-to-stick-check-your-skirt

Your offset will likely be different from anyone else or even another printer you own... all of mine are slightly different.

The rule of thumb is to START with a paper thickness and then adjust it up or down as needed until you get what is perfect (see picture again)