First layer PLA trouble

[mertseger]

Hi

I have problem with first layer. This picture show what I should get and what I realy get from printer



I read https://www.simplify3d.com/support/prin ... t-of-print

I tried with different extruder temp 190-210 (5), bed temperature (60-75), first layer height and width, different speed (lower speed from 50, 45...30), retraction distance (from 1 to 1,2 mm), extrusion multiplier (0,9 -0,95 -1).

every time part of plastic unstick from bed or made this strings.


I dont have any more idea what to do.

Please advice

[dorsai3d]

Looks like it's still too far from the bed. Try the suggestion from your link about "Nozzle starts too far from the bed," specifically lowering the Z-axis global offset further. If your machine won't let you get closer to the bed, you might need to run the bed leveling wizard or adjust your endstops.

[mertseger]

Thanks I will try this, but I level bed as much it is possible on M180. It has only 3 screws and it is hard to get it realy leveled. But this problem only strarts now, I printed few thing before with PLA and didnt have any problems. Will report........

[dkightley]

If you're happy your bed is level, then you don't need to have to twiddle with the bed adjusting screws....

The global z offset field on the Gcode tab of the settings can be used to try out fine tuning of bed height. Adjusting by a negative amount will raise the bed by the appropriate amount when the model prints.

I find that some of my prints need a negative z adjustment to ensure the first layer sticks well.....and some would be ruined by raising the bed. This is where this field comes into itself...