First Layer and Extrusion Problems

Frederik

what could be the cause of this message :

G28 Z
Error: Z probe already triggered at start of probing move
Error: Homing failed

i got this message on every 4th or 5th try to home z.

its a genuine bltouch

Veti

that sounds like a wiring probem

Frederik

@Veti i tought, perhaps its the standard and would be better for compatibility or troubleshoooting reasons...

Veti

@Frederik
no the standard is 0,0 is bottom left.

Frederik

@Veti ok , one moment i will check it with my multimeter... could it be a bad crimp ?

fcwilt

@Frederik said in First Layer and Extrusion Problems:

I could only mount the Endstop on the left side of my carriage and the Y Endstop is at the back

Hi,

The location of the end stop sensors do not determine where 0, 0 is located.

End stop sensors are used during homing, true, but they only "tell" the firmware the hardware is in a known location, which may be at the axis min, the axis max or somewhere else.

It is common to have 0, 0 at the left front corner of the bed. Another option is to have 0, 0 at the center of the bed - that is the what I do.

Frederick

Frederik

@fcwilt Ah ok, now i got it

Frederik

so, now to a new start... nozzle free again, probe working (was a light loose crimp pin on the black wire)

Frederik

ok ,looks good so far. i startet my first 20mm xyz test cube fingers crossed , i hope it will run through without clogging

Frederik

This is my very first successful Print:

It should be 20x20x20
And the actual dimensions are

X 20.10 MM WITH STEPS 160
Y 20.10 MM EITH STEPS 160
Z 20.40 MM WITH STEPS 400

Veti

you have not calibrated you e steps yet

Frederik

@Veti i forgot E 830

Veti

@Frederik said in First Layer and Extrusion Problems:

i forgot E 830

i dont know what you mean by that

here is a guide on how to calibration it
https://duet3d.dozuki.com/Guide/Ender+3+Pro+and+Duet+Maestro+Guide+Part+4:+Calibration/40#s165

Frederik

@Veti My extruder steps are correct. 100mm are 100mm

Veti

the bottom looks a bit strange, did you enable raft?

Frederik

@Veti brim was activated. but i´m struggling with the z offset a little bit. sometimes its really good , on the next try its scrubbing over the bed.
The cube was also printed on the backside of my buildplate. not the pei side to avoid any additional damage to my surface.

i adjusted the bed to the subframe assembly with my digital calipers to ~ 0.05mm equal distances.

then i checked my bltouch mountig if it is perpenticular to the bed. that is also good.

then i homed z.

after that a true bed level with G32
another G32

Then mesh compensation with G29 and another G32 to Load the new Heightmap.

Now im testing with ABS Filament. because the pla before was constantly clogging in the heatbreak.

i adjustet my retraction to 1mm with 25mm/s speed and will see if it will be better. i have zero stringing with these settings.

Veti

@Frederik said in First Layer and Extrusion Problems:

after that a true bed level with G32
another G32
Then mesh compensation with G29 and another G32 to Load the new Heightmap.

that is not a good idea. the G32 after the G29 will mess up the mesh. also after running G32 you need to establish a new Z

Frederik

@Veti oh, I didn't know that. Then I won´t do a G32 after the G28 anymore

is the software handling everything after the G32 automatically from the heightmap every time I start a new print?

A Former User

@Veti said in First Layer and Extrusion Problems:

that is not a good idea. the G32 after the G29 will mess up the mesh. also after running G32 you need to establish a new Z

If you have a bed.g like below you already re-establish the Z datum all in one go.......

; bed.g
;
; called to perform automatic bed compensation via G32
;
G28                         ; Home all
G30 P0 X2 Y-2 Z-99999       ; Probe near the front left lead-screw
G30 P1 X152 Y278 Z-99999    ; Probe near the rear lead screw 
G30 P2 X290 Y-2 Z-99999 S3  ; Probe near the front right lead-screw
G30 P0 X2 Y-2 Z-99999       ; Probe near the front left lead-screw (Second Pass)
G30 P1 X152 Y278 Z-99999    ; Probe near the rear lead screw (Second Pass)
G30 P2 X290 Y-2 Z-99999 S3  ; Probe near the front right lead-screw (Second Pass) 
G91                         ; Switch to relative positioning moves
G1 H2 Z5 F8000              ; Drop the Z axis (the bed) by 5mm relative to its current position
G90                         ; Revert back to absolute positioning moves
G1 X160 Y155 F8000          ; Position the nozzle at the centre of the bed
G30                         ; Probe and set the height as probed
G29 S1 P"heightmap.csv"     ; Load the height map

A Former User

@Frederik said in First Layer and Extrusion Problems:

@Veti oh, I didn't know that. Then I won´t do a G32 after the G28 anymore

G32 must be initiated AFTER the printer has homed all axises otherwise the printer has NO reference to work from.

Here is what the Duet G-Code dozuki lists G28 & G32 as :

G28 Home

Example

G28 ; Home all axes

The purpose of homing is to allow the printer to obtain a reference of where it is in space.

G32: Run bed.g macro
Parameters

None

Example

G32:

The firmware executes macro file bed.g. This macro normally uses G30 commands to probe the bed and then perform auto calibration of a delta printer (see Calibrating a delta printer), or perform bed leveling by moving the Z leadscrews independently, or display the manual corrections needed to the bed levelling screws.

So if you do not carry out G28 before you attempt to carry out G32 you will receive and error message ; Not enough axises homed

Unless the printer was already homed which is what G28 does anyway.....