differences between manual and automatic leveling

[Gip_86]

@fcwilt

hi Frederick

this is the message i got:

Error: Heater 0 fault: temperature rising much more slowly than the expected 1.3°C/sec
Resume state saved
Warning: Tool 0 was not driven because its heater temperatures were not high enough or it has a heater fault

[Blacksheep99]

@gip_86 Have you run a PID tune of your extruder and bed?

[Gip_86]

@blacksheep99

yes i have one done for the heater and the bed.

Bed:
Warning: heater behaviour was not consistent during tuning
Auto tuning heater 0 completed after 4 idle and 25 tuning cycles in 5317 seconds. This heater needs the following M307 command:
M307 H0 B0 R0.957 C113.0 D6.66 S1.00 V24.2
Edit the M307 H0 command in config.g to match this. Omit the V parameter if the heater is not powered from VIN.

Heater:

M307 H1 B0 R2.746 C97.9:59.2 D5.41 S1.00 V24.2

one question:
after firmwareupdate now it takes very long to heat up the bed. is this normal?

[Blacksheep99]

@gip_86 Have you got a config-override.g in your sys folder with the output of the tuning? You also need a M501 in your config.g if you do.

[Gip_86]

@blacksheep99

no, i have put the M307 in config directly..

; Heaters
M308 S0 P"bedtemp" Y"thermistor" T100000 B4400 ; configure sensor 0 as thermistor on pin bedtemp
M950 H0 C"bedheat" T0                          ; create bed heater output on bedheat and map it to sensor 0
;M307 H0 B0 S1.00                               
M307 H0 B0 R0.957 C113.0 D6.66 S1.00 V24.2	   ; disable bang-bang mode for the bed heater and set PWM limit
M140 H0                                        ; map heated bed to heater 0
M143 H0 S120                                   ; set temperature limit for heater 0 to 120C
M308 S1 P"e0temp" Y"thermistor" T100000 B4400  ; configure sensor 1 as thermistor on pin e0temp
M950 H1 C"e0heat" T1                           ; create nozzle heater output on e0heat and map it to sensor 1
;M307 H1 B0 S1.00                               
M307 H1 B0 R2.746 C97.9:59.2 D5.41 S1.00 V24.2 ; disable bang-bang mode for heater  and set PWM limit
M143 H1 S280                                   ; set temperature limit for heater 1 to 280C

if i put it in override, what have i to put in?
and in config should only M501?

[fcwilt]

@gip_86

It's perfectly fine to put everything in config.g

The config-override.g file is just to make it a bit easier as a M500 after certain operations makes the needed entries in config-override.g.

I have never used config-override.g - I move the contents to config.g and delete config-override.g

Frederick

[Gip_86]

@fcwilt

after pid tuning i have decided to add "R4700 behind the M308.

Now bed has heated really fast. Is there something agains R4700? I had this thing in my old config.

Now it looks like:

M308 S0 P"bedtemp" Y"thermistor" T100000 B4400 R4700
M308 S1 P"e0temp" Y"thermistor" T100000 B4400 R4700

[fcwilt]

@gip_86 said in differences between manual and automatic leveling:

@fcwilt

after pid tuning i have decided to add "R4700 behind the M308.

Now bed has heated really fast. Is there something agains R4700? I had this thing in my old config.

Now it looks like:

M308 S0 P"bedtemp" Y"thermistor" T100000 B4400 R4700
M308 S1 P"e0temp" Y"thermistor" T100000 B4400 R4700

Well the R setting is supposed to match the values of the resistors on your board.

If you don't have a R setting it is supposed to default to the correct values for your board.

Frederick

[Gip_86]

@fcwilt

Ok, machine is now running as aspected (but without mesh compensation)

I also have designed a new holder for the probe.

So and what are the best steps for next?

[fcwilt]

@gip_86 said in differences between manual and automatic leveling:

So and what are the best steps for next?

Have you made the configuration settings needed to use the Manual Bed Leveling Assistant?

Manual Bed Leveling Assistant

Once that is done and the bed is level you should then proceed to get Mesh Bed Compensation working.

Mesh Bed Compensation

Frederick

[Gip_86]

@fcwilt
ok i had done the neeed config and have leveled it. after several leveling, best i could do was about 0,03mm to adjust.

then i had done a G29 and heres the height map:

Any idears?

[fcwilt]

@gip_86

I have four different printers all with cast aluminum tool plate for the bed and they all are different.

I haven't taken the time to find out why as they all print ok.

[Gip_86]

@fcwilt

Ok, I also have a casted aluminium plate which is on both sides milled. I think my FR4 plate is the reason why it is so different. It’s a bit translucent.

Tomorrow I will give a try with the mesh.

[fcwilt]

@gip_86 said in differences between manual and automatic leveling:

@fcwilt

Ok, I also have a casted aluminium plate which is on both sides milled. I think my FR4 plate is the reason why it is so different. It’s a bit translucent.

Tomorrow I will give a try with the mesh.

I would agree the FR4 is likely the issue.

Frederick

[Gip_86]

@fcwilt

Yes but it’s a good Surface to print.

Could it help to decrease the probing points?

Or could it help to do a sanding of it?

[fcwilt]

@gip_86 said in differences between manual and automatic leveling:

Yes but it’s a good Surface to print.

I use a number of different print surfaces - all of the removable kind held in place by magnetic force.

I like being able to separately chose the bed heater, the bed material and the bed surface - the goal being to have the best combination of parts.

Could it help to decrease the probing points?

No, that would just hide the errors - to get the best results from using mesh compensation you would increase the number of points

Or could it help to do a sanding of it?

The changes you see in the height map are actually quite small - sanding would likely make things worse.

[engikeneer]

@gip_86 as @fcwilt said, I'd increase the probing points a bit. That way you can look for obvious points that are wrong and manually change then in the .csv file

You could also use the A and S parameters in your G31 M558 to do repeated probing at different points to improve accuracy.

Final point, my heightmap on my corexy is a lot worse than yours because my gantry sags a bit. However, I still get pretty good results with mesh compensation enabled so have not bothered to redesign it. Ultimately what matters is if you get good prints, not whether you have a perfectly flat heightmap (though we'd all love that! )

Edit: corrected reference to M558

[Marcossf]

@engikeneer said in

You could also use the A and S parameters in your G31 to do repeated probing at different points to improve accuracy.

I can't see in the Gcode dictionary the A option in the G31 command. How it works?

     G31: Set or Report Current Probe status
     Usage
 
     G31 Pnnn Xnnn Ynnn Znnn Cnnn Snnn

I'd like to get two/three probes in each probe point having a median to improve the probe accuracy.

[engikeneer]

@marcossf apologies, its M558 where you specify the A & S parameters for repeated probing... Will update my post

https://duet3d.dozuki.com/Wiki/M558

[Marcossf]

@engikeneer Ok, thanks. I'll try M558 A option.