Delta - Nozzle crashing into bed

Phaedrux

Have you actually tried to measure your probe trigger height yet?

https://docs.duet3d.com/en/User_manual/Connecting_hardware/Z_probe_testing#calibrate-the-z-probe-trigger-height

Also, just in case, can you send M122 and M98 P"config.g" and post the results?

malkem

@phaedrux
Hi and thanks for the reply!

Here the results

M122

=== Diagnostics ===
RepRapFirmware for Duet 2 WiFi/Ethernet version 3.4.0 (2022-03-15 18:58:31) running on Duet WiFi 1.02 or later
Board ID: 08DGM-956GU-DJMSN-6JKD2-3SN6T-TVNRD
Used output buffers: 3 of 24 (13 max)
=== RTOS ===
Static ram: 23868
Dynamic ram: 73840 of which 176 recycled
Never used RAM 14196, free system stack 184 words
Tasks: NETWORK(ready,13.0%,232) HEAT(notifyWait,0.0%,332) Move(notifyWait,0.0%,364) MAIN(running,85.7%,440) IDLE(ready,1.3%,30), total 100.0%
Owned mutexes: WiFi(NETWORK)
=== Platform ===
Last reset 00:01:23 ago, cause: power up
Last software reset at 2022-04-14 23:32, reason: User, GCodes spinning, available RAM 14296, slot 2
Software reset code 0x0003 HFSR 0x00000000 CFSR 0x00000000 ICSR 0x0041f000 BFAR 0xe000ed38 SP 0x00000000 Task MAIN Freestk 0 n/a
Error status: 0x00
Step timer max interval 0
MCU temperature: min 19.8, current 25.1, max 25.3
Supply voltage: min 24.2, current 24.2, max 24.5, under voltage events: 0, over voltage events: 0, power good: yes
Heap OK, handles allocated/used 0/0, heap memory allocated/used/recyclable 0/0/0, gc cycles 0
Events: 0 queued, 0 completed
Driver 0: standstill, SG min n/a
Driver 1: standstill, SG min n/a
Driver 2: standstill, SG min n/a
Driver 3: standstill, SG min n/a
Driver 4: standstill, SG min n/a
Driver 5: 
Driver 6: 
Driver 7: 
Driver 8: 
Driver 9: 
Driver 10: 
Driver 11: 
Date/time: 2022-04-15 11:46:34
Cache data hit count 2901757074
Slowest loop: 15.73ms; fastest: 0.19ms
I2C nak errors 0, send timeouts 0, receive timeouts 0, finishTimeouts 0, resets 0
=== Storage ===
Free file entries: 10
SD card 0 detected, interface speed: 20.0MBytes/sec
SD card longest read time 1.2ms, write time 0.0ms, max retries 0
=== Move ===
DMs created 83, segments created 0, maxWait 0ms, bed compensation in use: none, comp offset 0.000
=== MainDDARing ===
Scheduled moves 0, completed 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== AuxDDARing ===
Scheduled moves 0, completed 0, hiccups 0, stepErrors 0, LaErrors 0, Underruns [0, 0, 0], CDDA state -1
=== Heat ===
Bed heaters 0 -1 -1 -1, chamber heaters -1 -1 -1 -1, ordering errs 0
=== GCodes ===
Segments left: 0
Movement lock held by null
HTTP is idle in state(s) 0
Telnet is idle in state(s) 0
File is idle in state(s) 0
USB is idle in state(s) 0
Aux is idle in state(s) 0
Trigger is idle in state(s) 0
Queue is idle in state(s) 0
LCD is idle in state(s) 0
Daemon is idle in state(s) 0
Autopause is idle in state(s) 0
Code queue is empty
=== Network ===
Slowest loop: 161.06ms; fastest: 0.00ms
Responder states: HTTP(0) HTTP(0) HTTP(0) HTTP(0) FTP(0) Telnet(0), 0 sessions
HTTP sessions: 1 of 8
- WiFi -
Network state is active
WiFi module is connected to access point 
Failed messages: pending 0, notready 0, noresp 0
WiFi firmware version 1.26
WiFi MAC address 5c:cf:7f:76:68:64
WiFi Vcc 3.36, reset reason Turned on by main processor
WiFi flash size 4194304, free heap 24408
WiFi IP address 192.168.178.33
WiFi signal strength -47dBm, mode 802.11n, reconnections 0, sleep mode modem
Clock register 00002002
Socket states: 4 0 0 0 0 0 0 0

M98 P"config.g"

HTTP is enabled on port 80
FTP is disabled
TELNET is disabled
Error: bad grid definition: Too many grid points; suggest increase spacing to 13.0mm
Error: Pin 'fan1' is not free
Error: Fan number 2 not found

@phaedrux said in Delta - Nozzle crashing into bed:

Have you actually tried to measure your probe trigger height yet?
https://docs.duet3d.com/en/User_manual/Connecting_hardware/Z_probe_testing#calibrate-the-z-probe-trigger-height

I've done this in the past but I will give it another try.
I haven't change any hardware components.

malkem

Just measured the Z trigger height. It is -0.15
I've set the Z value to -2 so the nozzle should be far above the bed, am I right?

Phaedrux

@malkem said in Delta - Nozzle crashing into bed:

I've set the Z value to -2 so the nozzle should be far above the bed, am I right?

Yes. -2mm is pretty extreme. That would make it think that the nozzle is 2mm below the bed surface when the probe triggers.

So tell me this, set your G31 Z trigger height correctly to -0.15 and then if you do a G28 to home the towers and then a G30 to probe the bed to set Z0, if you then send G1 Z0 does the nozzle end up just touching the bed?

malkem

@phaedrux
Good morning phaedrux

I just did how you said and the nozzle was not crashing into the bed.
The space between nozzle and bed was just enough to slide in the sheet of paper I used to determine the Z trigger height.
I've send G32 after G30 and went again to Z0 and nothing has changed, it was enough space to slide in the sheet of paper.
This part seems working fine.

So what the hell is the problem of my printer?
I'm close to toss him out the window

malkem

I'm running out of ideas.

Should I downgrade? Is it even possible?
In my old config.g (v2.05) I've used P1 instead of P8 "M558 P1 H18 F240 R0.4 T4000"
Could it change anything?

I took a look into the gcode file, there is also nothing suspicious in my opinion.

; generated by PrusaSlicer 2.4.1+win64 on 2022-04-16 at 18:16:02 UTC

; 

; external perimeters extrusion width = 0.50mm
; perimeters extrusion width = 0.50mm
; infill extrusion width = 0.46mm
; solid infill extrusion width = 0.45mm
; top infill extrusion width = 0.40mm
; support material extrusion width = 0.35mm
; first layer extrusion width = 0.70mm

M107
M190 S60 ; set bed temperature and wait
;TYPE:Custom
;M558 P1 H8.5 F240 R0.4 T4000
M558 P8 R0.4 C"zprobe.in+zprobe.mod" H3 F240 T6000

M109 S120
G28
G1 X0 Y0 Z8.5 F6000
G30
G32    ; auto calibration
G29 S1 ; heightmap.csv

G1 X0 Y0 Z100; lift nozzle

M104 S210
M109 S210

G1 X0 Y0 Z10; lower nozzle
G21 ; set units to millimeters
G90 ; use absolute coordinates
M82 ; use absolute distances for extrusion
G92 E0
;M572 D0 S0.05; linear advanced PLA-NX2
M107
;LAYER_CHANGE
;Z:0.35
;HEIGHT:0.35
G1 Z.35 F27000
G1 E-2.8 F2400
G92 E0
G1 Z.55 F27000
G1 X0 Y14.575
G1 Z.35
G1 E2.8 F2400
;TYPE:Skirt/Brim
;WIDTH:0.7
G1 X-43.737 Y14.575 E6.49863
G1 X-44.622 Y14.439 E6.57429
G1 X-45.393 Y14.072 E6.64657
G1 X-46.033 Y13.478 E6.72039
G1 X-46.457 Y12.732 E6.79294
G1 X-46.657 Y11.769 E6.87613
G1 X-46.546 Y10.734 E6.96417
G1 X-46.132 Y9.713 E7.05727
G1 X-45.438 Y8.762 E7.15689
G1 X-22.591 Y-14.091 E9.88954
G1 X-21 Y-14.75 E10.03515
G1 X21 Y-14.75 E13.58686
G1 X22.591 Y-14.091 E13.73247
G1 X45.633 Y8.986 E16.4902
G1 X46.078 Y9.619 E16.5556
G1 X46.402 Y10.284 E16.6182
G1 X46.598 Y10.965 E16.67807
G1 X46.661 Y11.635 E16.73506
G1 X46.584 Y12.315 E16.79292
G1 X46.377 Y12.92 E16.84695
G1 X46.047 Y13.461 E16.90053
G1 X45.613 Y13.908 E16.95323
G1 X44.75 Y14.397 E17.03707
G1 X43.737 Y14.575 E17.12405
G1 X.06 Y14.575 E20.81758
G1 X.06 Y13.95 F27000
G1 F2400
G1 X-43.722 Y13.95 E24.52001
G1 X-44.426 Y13.846 E24.58014
G1 X-45.043 Y13.554 E24.63786
G1 X-45.533 Y13.103 E24.69422
G1 X-45.878 Y12.498 E24.7531
G1 X-46.035 Y11.694 E24.82235
G1 X-45.925 Y10.831 E24.89594
G1 X-45.559 Y9.97 E24.97506
G1 X-44.963 Y9.169 E25.0595
G1 X-22.149 Y-13.649 E27.78808
G1 X-21 Y-14.125 E27.89325
G1 X21 Y-14.125 E31.44496
G1 X22.149 Y-13.649 E31.55013
G1 X45.101 Y9.324 E34.29624
G1 X45.779 Y10.41 E34.40454
G1 X45.961 Y10.973 E34.45455
G1 X46.034 Y11.532 E34.50226
G1 X45.996 Y12.068 E34.54771
G1 X45.849 Y12.571 E34.592
G1 X45.597 Y13.018 E34.63538
G1 X45.24 Y13.405 E34.67995
G1 X44.547 Y13.806 E34.74759
G1 X43.725 Y13.95 E34.81815
G1 X.12 Y13.95 E38.50562
G1 E35.70562
G92 E0
G1 Z.55 F27000
G1 X-20.161 Y-1.329
G1 Z.35
G1 E2.8 F2400
;TYPE:Perimeter
G1 X-20.429 Y-.989 E2.83663
G1 X-20.751 Y-.714 E2.87243
G1 X-21.128 Y-.502 E2.90899
G1 X-21.53 Y-.372 E2.94472
G1 X-21.957 Y-.321 E2.98107
G1 X-22.364 Y-.351 E3.01556
G1 X-22.781 Y-.465 E3.05212
G1 X-23.169 Y-.66 E3.08883
G1 X-23.502 Y-.92 E3.12457
G1 X-23.784 Y-1.248 E3.16116
G1 X-23.991 Y-1.614 E3.19668
G1 X-24.124 Y-2.012 E3.23219
G1 X-24.179 Y-2.443 E3.26895
G1 X-24.147 Y-2.876 E3.3057
G1 X-24.034 Y-3.283 E3.34141
G1 X-23.84 Y-3.669 E3.37791
G1 X-23.581 Y-4 E3.41346
G1 X-23.264 Y-4.276 E3.44898
G1 X-22.888 Y-4.49 E3.48555
G1 X-22.488 Y-4.624 E3.52129
G1 X-22.059 Y-4.679 E3.55783
G1 X-21.638 Y-4.649 E3.59351
G1 X-21.219 Y-4.535 E3.63025
G1 X-20.831 Y-4.339 E3.66702
G1 X-20.498 Y-4.08 E3.70269
G1 X-20.217 Y-3.753 E3.73914
G1 X-20.009 Y-3.387 E3.77478
G1 X-19.875 Y-2.986 E3.81052
G1 X-19.821 Y-2.544 E3.84817
G1 X-19.854 Y-2.122 E3.88399
G1 X-19.966 Y-1.716 E3.91955
G1 X-20.134 Y-1.383 E3.95117
G1 X-20.691 Y-1.666 F27000
;TYPE:External perimeter
G1 F2400
G1 X-20.882 Y-1.424 E3.97729
G1 X-21.11 Y-1.229 E4.00268
G1 X-21.38 Y-1.077 E4.02882
G1 X-21.665 Y-.985 E4.05414
G1 X-21.971 Y-.949 E4.0802
G1 X-22.258 Y-.97 E4.10451
G1 X-22.556 Y-1.051 E4.13066
G1 X-22.833 Y-1.191 E4.15685
G1 X-23.069 Y-1.375 E4.18218
G1 X-23.271 Y-1.609 E4.20835
G1 X-23.418 Y-1.869 E4.23357
G1 X-23.512 Y-2.152 E4.25879
G1 X-23.551 Y-2.459 E4.28502
G1 X-23.528 Y-2.769 E4.31124
G1 X-23.448 Y-3.057 E4.33655
G1 X-23.309 Y-3.333 E4.36265
G1 X-23.126 Y-3.568 E4.3879
G1 X-22.9 Y-3.764 E4.41312
G1 X-22.632 Y-3.917 E4.43929
G1 X-22.348 Y-4.012 E4.46461
G1 X-22.041 Y-4.051 E4.49075
G1 X-21.743 Y-4.03 E4.51602
G1 X-21.444 Y-3.949 E4.54224
G1 X-21.167 Y-3.809 E4.56848
G1 X-20.931 Y-3.625 E4.59375
G1 X-20.73 Y-3.392 E4.61981
G1 X-20.583 Y-3.131 E4.64514
G1 X-20.488 Y-2.847 E4.67046
G1 X-20.449 Y-2.53 E4.69748
G1 X-20.472 Y-2.231 E4.72288
G1 X-20.552 Y-1.943 E4.74814
G1 X-20.664 Y-1.72 E4.76925
G1 X-20.549 Y-1.392 F27000
G1 E1.96925 F2400
G92 E0

fcwilt

@malkem

Why did you change to probe type 8?

I would think the strain gauge would output an analog signal.

Frederick

malkem

@fcwilt
I changed it back to P1, it didn't help. Got the same results.
If I do it manually G28 -> G30 -> G32 and move the nozzle to Z0, there is a gap between bed and nozzle, just how we would expect.

If I upload a gcode file and start to print, the DWC shows that the nozzle is moving to the first layer height to Z.35. But the nozzle is actually flat on the bed.

fcwilt

@malkem

Well in the print file you have G28 then G30 then G32 then G29.

Remember that G29 is going to change the Z position based on the X/Y position.

Also for the height map to work correctly you need to set the Z=0 Datum before creating the height map and before loading the height map. Moreover the X/Y position used for setting the Z=0 Datum must always be the same. I use the center of the bed which for me is at X=0 Y=0.

I don't have a delta so I am not sure what G32 does, exactly, but I think you should still have a G30 at your reference point before you do the G29.

And did you set the Z=-0 Datum before creating the height map?

Frederick

malkem

@fcwilt
Hi and thanks for your time helping me out here

heightmap and G29 was never a problem before. I've also tried without G29.
I downgraded to version 2.05 and my printer works again.

I dont know if this is a bug or just me doing something wrong.
If you guys want me to try something out, I will do it. But for now I'll stay on version 2.05.