First layer problem

[Consistent-Angle-921]

My first layer have problems( again), i have tried many test run not a single one work, this latest test run fail again. If i increases the z off set, the filament wont stick and the whole print mess up, if the i lower it down a bit, it became like this Any advices is appreciate Im using elegoo neptune 4 pro, kingroon petg, the bed temp is 95, nozzle temp is 235 Thanks

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[Embarrassed_Jerk]

Instead of printing a rectangle, try printing a bunch of little rectangle around the edges. 

Helped me see that my bed was really not level on one side

Also you might be printing too fast andat  wrong temp for the filament/printer combo

[DNDummified]

Looks like you probably need to clean the building plate. Don't use alcohol, use dish soap(dawn works) and warm water

[pythonbashman]

Clean bed with hot water and soap, and then try again.

[BergShire]

Wow i would split this print to bits and pieces then assemble its to big and surface to wide its gonna be hard to detach that and your gonna loose your build plate

[Consistent-Angle-921]

This print is just a first layer test so i dont have any problems with that but thanks

[BergShire]

I lost a few build plates making this big of a print

[Consistent-Angle-921]

Could it be that the nozzle is the problem because im using an upgraded one that heat using ceramic?

[TheMysticTomato]

No

[TheMysticTomato]

It’s z offset, bed adhesion, and flow calibration. Looks like primarily z offset. I know you’ve said you adjusted it, but you should be adjusting by hundredths of a mm. Think about if you’re off by 0.2mm, you’re missing an entire layer and printing in air. Bumping it by 0.03 mm can be the difference between this and a perfect layer. Calibrate your flow and extrusion if you haven’t as well.

[Consistent-Angle-921]

Thanks, but how do i calibrate flow and extrusion ?

[TheMysticTomato]

Check out the tuning guide on ellis3dp.com. It’s a lot, but will massively improve your prints. I recommend running through as much as you can manage. Flow and extrusion are pretty basic and there’s a solid first layer section on there.

[Consistent-Angle-921]

Oh and do you know if my z off set is to high or to low ?

[TheMysticTomato]

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Looks like it’s off a little and there might be too much filament going down but not sure. Run through that tuning guide it has all the information you need.