First Layer and Extrusion Problems

Frederik

pla_unload.g pla_load.g pla_config.g Hello togehter,

i finished my first corexy build yesterday and wanted to tune the z offset for a good first layer with your tutorial for BLtouch and independent Z leveling.

But now i have the Problem that my z offset is way to high and i dont know where to put the new values in.

in my config is the following line for my BLtouch:

; Z-Probe
M950 S0 C"io7.out" ; create servo pin 0 for BLTouch
M558 P9 C"^io7.in" H5 F120 T6000 ; set Z probe type to bltouch
G31 P500 X-26 Y2 Z2.5 ; set Z probe trigger value, offset and trigger height
M557 X50:400 Y50:400 S50 ; define Mesh Grid

After Leveling the bed with a piece of paper and setting Z=0 with G92 Z0

then a single measurement with G30 S-1 where i get the value of x.xxx

when i am changing the Z value, i dont get it right. or is there something i am missing ?

The indipendent Z Leveling seems to work just Fine.

But my High Map is a Desaster i tried Tue BEd Level First and then a Mesh Compensation.

The other Problem is that my Extruder seems to skip steps and is constantly feeding to less material. The E STeps are 830 for a Original Direct Drive BMG with a E3d Volcano with 0.4 Nozzle. When i am manual Extrudiong at 225° i cant go with the speed over 5 -15 mm bevor it starts making strange clicking noises.

Where can i set the Retractions Paramters etc. ?
I tried using the Filaments Macros with the load, unload and config files , but i dont know if it is correct .

Reprap 3.1.1
Duet 3 + RPI 3b+
0.9° Pancake Stepper on the BMG
1.8° Z Stepper

Tried printing PLA with 215 ° Nozzle and Bed 60°

config (1).g
homez.g
bed.g
pla_config.g
pla_load.g
pla_unload.g

Kindly Regards
Frederik

Frederik

I dont know where i can change the offset ?
Do i have to add a command after the BLTouch Lines or change the trigger height ?

The dozuki only says to change the G31 , but how ?!?

pipersw

in config.g :
G31 P500 X-26 Y2 Z2.5 <= modify the Z, increase value for reduce height of nozzle

Frederik

ok thanks , one moment i will try it

Frederik

Is the Right way to do a bed leveling:

first G32
then G 28
and then adjusting for the right layer height ?

This is my First Printer build

Veti

G29 S1 ; Load previously set bed map

this should not be in the config.g

the mesh should be loaded after you have established z=0

so a good place is the start of your slicer g code

for the offset see
https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#Section_Calibrate_the_Z_probe_trigger_height

Frederik

when i run first a true bed level and then a bed mesh compensation i get the following heightmap:

RepRapFirmware height map file v2 generated at 2020-11-20 14:53
xmin,xmax,ymin,ymax,radius,xspacing,yspacing,xnum,ynum
0.00,340.00,0.00,370.00,-1.00,20.00,20.00,18,19
2.000, 1.878, 1.875, 1.890, 1.685, 1.642, 1.517, 1.442, 1.358, 1.253, 1.180, 1.145, 1.135, 1.138, 1.160, 1.177, 1.250, 1.333
1.715, 1.562, 1.735, 1.757, 1.603, 1.550, 1.423, 1.320, 1.240, 1.132, 1.075, 1.030, 1.020, 1.020, 1.048, 1.062, 1.105, 1.183
1.683, 1.645, 1.835, 1.725, 1.558, 1.397, 1.267, 1.160, 1.070, 1.010, 0.943, 0.925, 0.910, 0.922, 0.975, 1.005, 1.022, 1.100
1.635, 1.677, 1.760, 1.573, 1.440, 1.302, 1.163, 1.052, 0.970, 0.905, 0.847, 0.815, 0.802, 0.815, 0.855, 0.892, 0.930, 1.010
1.603, 1.555, 1.608, 1.442, 1.285, 1.150, 1.060, 0.953, 0.833, 0.755, 0.712, 0.690, 0.685, 0.695, 0.730, 0.770, 0.818, 0.927
1.483, 1.513, 1.510, 1.255, 1.155, 1.025, 0.943, 0.828, 0.795, 0.685, 0.597, 0.578, 0.573, 0.578, 0.613, 0.653, 0.722, 0.812
1.440, 1.442, 1.358, 1.160, 0.998, 0.858, 0.715, 0.642, 0.648, 0.542, 0.507, 0.507, 0.510, 0.533, 0.557, 0.610, 0.675, 0.775
1.478, 1.415, 1.267, 1.017, 0.917, 0.797, 0.743, 0.680, 0.615, 0.605, 0.432, 0.413, 0.420, 0.440, 0.455, 0.505, 0.573, 0.677
1.355, 1.205, 1.100, 0.875, 0.770, 0.672, 0.648, 0.590, 0.523, 0.417, 0.307, 0.300, 0.312, 0.333, 0.352, 0.392, 0.455, 0.555
1.212, 1.145, 0.953, 0.783, 0.632, 0.550, 0.560, 0.490, 0.360, 0.280, 0.203, 0.208, 0.225, 0.233, 0.238, 0.292, 0.352, 0.453
1.112, 1.010, 0.820, 0.632, 0.493, 0.390, 0.395, 0.347, 0.243, 0.158, 0.092, 0.100, 0.127, 0.120, 0.127, 0.163, 0.215, 0.333
1.005, 0.875, 0.705, 0.480, 0.358, 0.243, 0.212, 0.165, 0.115, 0.045, -0.010, 0.005, 0.010, 0.007, 0.012, 0.047, 0.097, 0.212
0.913, 0.750, 0.557, 0.318, 0.233, 0.108, 0.057, -0.002, -0.062, -0.110, -0.153, -0.148, -0.132, -0.137, -0.108, -0.068, 0.005, 0.095
0.797, 0.625, 0.425, 0.248, 0.127, -0.012, -0.097, -0.160, -0.220, -0.270, -0.283, -0.288, -0.270, -0.265, -0.227, -0.158, -0.105, -0.023
0.698, 0.483, 0.167, 0.115, -0.005, -0.145, -0.248, -0.302, -0.368, -0.440, -0.453, -0.475, -0.470, -0.430, -0.387, -0.315, -0.265, -0.182
0.500, 0.312, 0.070, -0.078, -0.193, -0.310, -0.408, -0.467, -0.552, -0.592, -0.575, -0.573, -0.578, -0.547, -0.495, -0.427, -0.350, -0.267
0.358, 0.160, -0.092, -0.172, -0.295, -0.415, -0.500, -0.573, -0.642, -0.665, -0.627, -0.595, -0.637, -0.640, -0.583, -0.515, -0.438, -0.347
0.265, 0.068, -0.240, -0.307, -0.420, -0.557, -0.640, -0.690, -0.735, -0.715, -0.660, -0.653, -0.730, -0.743, -0.698, -0.627, -0.542, -0.432
0.105, -0.070, -0.250, -0.320, -0.557, -0.677, -0.762, -0.797, -0.802, -0.773, -0.743, -0.795, -0.852, -0.833, -0.752, -0.670, -0.625, -0.517

Frederik

That is the orresponding height map picture from my DWC

Veti

post the output of 3 consecutive G32.

most likely your motor order is wrong

Frederik

1.G32
Leadjustments made: -2.618 -0.246 -0.521, points used 3, (mean, deviation) before (-0.997, 0.862) after (0.000, 0.000)

2.G32
Leadscrew adjustments made: -0.054 1.112 0.200, points used 3, (mean, deviation) before (0.399, 0.459) after (-0.000, 0.000)

3.G32
Leadscrew adjustments made: 0.044 0.756 -0.011, points used 3, (mean, deviation) before (0.228, 0.321) after (0.000, 0.000)

Frederik

i´ve checked the cabling.

left front spindle is connected to driver 2
back center spindle to driver 3
right front spindle to driver 4

fcwilt

Hi,

Do you lead screws really have pitch of 1.25?

Regards bed.g:

I'm not sure what having two P parameters is going to do to your bed leveling.

Why did you add the second P1.25?

Frederick

Veti

@fcwilt said in First Layer and Extrusion Problems:

Do you lead screws really have pitch of 1.25?

he has z400. where did you see 1.25 leadscrew?
M92 X160.00 Y160.00 Z400.00 E830.00 ; set steps per mm

Veti

@Frederik said in First Layer and Extrusion Problems:

1.G32
Leadjustments made: -2.618 -0.246 -0.521, points used 3, (mean, deviation) before (-0.997, 0.862) after (0.000, 0.000)
2.G32
Leadscrew adjustments made: -0.054 1.112 0.200, points used 3, (mean, deviation) before (0.399, 0.459) after (-0.000, 0.000)
3.G32
Leadscrew adjustments made: 0.044 0.756 -0.011, points used 3, (mean, deviation) before (0.228, 0.321) after (0.000, 0.000)

that seems to be converging. can you run a g29 now and post the picture

fcwilt

@Veti said in First Layer and Extrusion Problems:

@fcwilt said in First Layer and Extrusion Problems:

Do you lead screws really have pitch of 1.25?

he has z400. where did you see 1.25 leadscrew?
M92 X160.00 Y160.00 Z400.00 E830.00 ; set steps per mm

See his bed.g file.

He has two P parameters for each G30. Not sure if that is messing things up or not.

Frederick

Veti

@fcwilt

good catch.
yes the second P1.25 parameter should be removed. this is not a valid parameter for G30
your pitch is 8mm btw.

fcwilt

@Veti said in First Layer and Extrusion Problems:

your pitch is 8mm btw.

How can we be sure the pitch is 8mm? The config values might be wrong. Maybe the comment in bed.g is correct?

Clarification is needed from the OP.

Frederick

Frederik

ok ,i have changed it.

is it possible to create a homez.g file where it automatically probes the bed on three points and enable compensation ?

perhaps like :

; homez.g
; called to home the Z axis
;
; generated by RepRapFirmware Configuration Tool v3.1.7 on Wed Nov 18 2020 18:04:17 GMT+0100 (Mitteleuropäische Normalzeit)

G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G90 ; absolute positioning
G1 X240 Y220 F6000 ; go to first probe point
G32 ; home Z by True bed leveling 3 points in bed.g

or do i have to include the three positions like

G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current position
G90 ; absolute positioning
G1 X240 Y220 F6000 ; go to first probe point
G30 P0 X330 Y240 Z-9999 ; Front Left
G30 P1 X150 Y0 Z-9999 ; Middle Back
G30 P2 X0 Y248 Z-9999 S3 ; Front Right and compensate 3mm

Veti

@Frederik

create a macro that calls G28 and G32

Veti

@fcwilt said in First Layer and Extrusion Problems:

How can we be sure the pitch is 8mm?

i cant, but there is a very high chance that isnt a M8 metric lead screw.