Cura Printing first layer too high on CR20

[alphaomega 0]

Hi there,

Whenever I start printing, Cura just raises the nozzle high and the filament doesn't stick to the bed. I have to LIVE adjust Z offset everytime.

I have a Creality Cr20 Pro.

 

This is my G-code, If someone can gladly help me please? Much much appreciated.

 

M201 X500.00 Y500.00 Z100.00 E5000.00 ;Setup machine max acceleration

M203 X500.00 Y500.00 Z10.00 E50.00 ;Setup machine max feedrate

M204 P500.00 R1000.00 T500.00 ;Setup Print/Retract/Travel acceleration

M205 X8.00 Y8.00 Z0.40 E5.00 ;Setup Jerk

M220 S100 ;Reset Feedrate

M221 S100 ;Reset Flowrate

 

G28 ;Home

M420 S1 Z2 ;Enable ABL using saved Mesh and Fade Height

 

G92 E0 ;Reset Extruder

G1 Z2.0 F3000 ;Move Z Axis up

G1 X10.1 Y20 Z0.28 F5000.0 ;Move to start position

G1 X10.1 Y200.0 Z0.28 F1500.0 E15 ;Draw the first line

G1 X10.4 Y200.0 Z0.28 F5000.0 ;Move to side a little

G1 X10.4 Y20 Z0.28 F1500.0 E30 ;Draw the second line

G92 E0 ;Reset Extruder

G1 Z2.0 F3000 ;Move Z Axis up

 

[gr5 2,265]

It looks fine to me.  I don't understand the M420 command.  I'm not familiar with that - it's not a UM (ultimaker) standard.  According to this:

 https://reprap.org/wiki/G-code#M420:_Leveling_On.2FOff.2FFade_.28Marlin.29

 

The "Z2" means mesh compensation ends at Z=2mm (so it compensates from Z=0 until Z=2).

 

Could it be that your mesh compensation values are off?

 

I'm adding "cr20" to your topic title so that people who own a creality will notice your topic.  This is an Ultimaker forum so most people own Ultimakers or have cura questions.  Your question is cura related but is more of a creality specific question.

[alphaomega 0]

18 hours ago, gr5 said:

It looks fine to me.  I don't understand the M420 command.  I'm not familiar with that - it's not a UM (ultimaker) standard.  According to this:

 https://reprap.org/wiki/G-code#M420:_Leveling_On.2FOff.2FFade_.28Marlin.29

 

The "Z2" means mesh compensation ends at Z=2mm (so it compensates from Z=0 until Z=2).

 

Could it be that your mesh compensation values are off?

 

I'm adding "cr20" to your topic title so that people who own a creality will notice your topic.  This is an Ultimaker forum so most people own Ultimakers or have cura questions.  Your question is cura related but is more of a creality specific question.

Hi, there.

Thank's for replying , I know nothing about mesh :(.

[gr5 2,265]

Mesh leveling is a feature where it takes many measurements of your build plate by pushing the head down onto the bed many times.  Typically at least a grid of 4X4 or 16 measurements.  This data is called a "mesh" as it resembles a 3d graphics concept - like a map of mountains/hills.  Anyway the M420 command enables the mesh leveling.

 

I know nothing about your printer but is it possible that you never did a multi point leveling?  Maybe you should just get rid of that M420 command to see what happens.  Or maybe you need to run the multipoint leveling once before you start your print?

 

I would try to find a creality forum somewhere and those people should know immediately what your issue is.

[alphaomega 0]

17 hours ago, gr5 said:

Mesh leveling is a feature where it takes many measurements of your build plate by pushing the head down onto the bed many times.  Typically at least a grid of 4X4 or 16 measurements.  This data is called a "mesh" as it resembles a 3d graphics concept - like a map of mountains/hills.  Anyway the M420 command enables the mesh leveling.

 

I know nothing about your printer but is it possible that you never did a multi point leveling?  Maybe you should just get rid of that M420 command to see what happens.  Or maybe you need to run the multipoint leveling once before you start your print?

 

I would try to find a creality forum somewhere and those people should know immediately what your issue is.

Hey man, I managed to fix the problem.

It was the bed levelling issue on the cr20 pro causing problems. What I mean is that the CR20 pro has only two knobs which you can adjust and are located on the right side. What happens is when you adjust those knobs, the bed lifts from the right and goes down on the left and makes the bed slanting. If you don't tighten those nuts it will simple wobble around. What I did is bought some turning knobs and springs off amazon and manually calibrated the bed. Thank's for replying back and try to help me. I now need some adjustments due some layers are being printed rough which I will try to reduce the flow to 90% and raise the nozzle up a little and hope it works. Also set Cura initial layer flow to 200% with 0.23mm layer height and the first print sticks, also if it doesn't I can manually live adjust using the baby Z steps and lower the nozzle down for the first layer and than up it again.

Super thanks man.

[mkrmec 0]

When you're calibrating it a normal A4 paper should drag on the nozzle a bit when moving it. On my Ender 3 Pro it works great. Be sure to adjust all knobs many times, because when you move one the other side moves. Eventually it will be level. No other config required on software side.