Solved Can't get Z low enough to print properly

Even with Z-offset set to zero I still get squiggly lines for a skirt b4 I cancel the print.
Looks like a fix might be to check the box "Z Can Be Negative" and keep decreasing the value as needed?
Which brings another question to mind, can I actually set the value to tenths/hundredths mm, or have I been trying to in vain?

 

Where are you defining the Z offset? have you run the automatic printer configuration? Going negative is probably what you want but it depends on the slicer.

Are you homing correctly? http://help.robo3dprinter.com/Guide/Homing+Your+Extruder/7

Whats your g29 response codes from terminal?

 

I'm pretty sure I'm making progress FINALLY! Thanx to the help y'all offer on these forums Doing a test print now.
I went to verify that I knew what the "automatic printer configuration" was, and long story short, all I did was disable the "Automatic Print Leveling" (conflicting leveling programs?) and reset the Z to 1mm (under slice settings>z offset).
and, yes I get it home ok, and I have no clue wutza "g29 response code from terminal"

I'll confess - I'm brand new to this 3D printing stuff - a lot more to it than @ 1st glance
(but it's still the coolest thing since sliced bread!)

 

yeah that automatic printer level calibration will conflict with any offsets. Terminal window is kinda like a log window, shows what commands have been sent to the printer and gets temperature responses. Sorta like a chat window between the computer and arduino.

http://www.matterhackers.com/articles/mattercontrol-guide-to-the-terminal

G29 is the autolevel code that runs at the beginning of the print. They paint a good picture of what the arduino received from the autolevel routine.

A lot of my responses are quick snippets while I wait for my program to respond. Sometimes they require some extra googling depending on how much the user knows

 

It helped me figure out what to search for - BIG HELP! Sorry I didn't get back sooner -
disabling the auto level got the z low enough to get my first successful test print (PLA bridge cube @ aprox 27mm), so then I started a more intricate print, which other than a new issue (maybe a new thread on that) printed fine
(and I found the Gcode Terminal)

A relevant question would be - what if I thought I needed to drop the z a little more, is that possible? Could I go by .1mm increments?

Other than that, I'd say issue resolved, thanx again for the help!

 

Well a step on M8 is 1/2560mm So that's the minimum increment you can work at