Duet3 BLTOUCH3.1 Probe deploys but doesn't trigger on Z Home
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Not exactly. The M950 command is just defining a servo. It doesn't know the servo is used by a probe. The config tool generates the M950 first and I use it that way myself and it works.
; Endstops M574 Z1 S2 ; configure Z-probe endstop for low end on Z ; Z-Probe M950 S0 C"1.io0.out" ; create servo pin 0 for BLTouch M558 P9 C"^1.temp0" H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds G31 P500 X0 Y0 Z2.5 ; set Z probe trigger value, offset and trigger height M557 X15:215 Y15:195 S20 ; define mesh grid -
Well there you have it!
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By the way, where are you guys located? I'm in Perth, Australia (originally from the UK). I'm just loving the fact that you're in a time zone that makes this support process so responsive.
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I'm in Canada (Quebec). I'm not tech support, just a very enthusiastic Duet lover.
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@Thalios - agreed. I love this product, and the community makes the journey very rewarding.
Sad to say, with the new config changes and moving the connector to io5, my BL touch probe is still failing to stop the bed rising when executiong G28 Z.
Also, if I execute M401, and periodically, and briefly, tap the probe with my finger, the Z sensor in DWC always shows 0. I think I have to wait now for another BL Touch 3.1 to arrive, which may only be a couple more days.
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@Thalios - actually, may I ask if you have a brief sequence that you used to test your BLT?
For example, did you HOMEX/Y then execute G30, etc?
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When testing on a new printer, I home X, then Y, then set the bed far enough to stop it manually, and do a manual G30. If the bed stops when I manually push the bl touch in, i know it's good to go.
also, did you create a deployprobe.g and retractprobe.g?
This is my homez.g.
G91 G1 Z5 F800 H2 ;_RRF3_ change S2 to H2 G90 G1 X150 Y150 F2400 ; Move head to center of bed M558 A1 F800 B0 ; Set single probing at faster feed rate G30 ; Do a single probe to home our Z axis M558 A5 F120 B1 ; Set multi probing at slower feed rate G30 ; Probe again to get a more accurate position G1 Z2 F200 -
@vistalert said in Duet3 BLTOUCH3.1 Probe deploys but doesn't trigger on Z Home:
@Thalios @Phaedrux well what is interesting to the novice is how some add the Z endstop indicating a Z probe, and others seem to have a complete absence of Z endstop config.
It's actually irrelevant to the probe how the z endstop is defined, because the probe is defined in M558 and G31 and called with G30. You can actually define the Z endstop as an endstop and use a z endstop in addition to the probe. G1 H1 Z-400 (home with an endstop) and G30 (home with the probe).
The reason an endstop can be defined as a probe is for using a probe device on an axis other than Z such as XY.
@vistalert said in Duet3 BLTOUCH3.1 Probe deploys but doesn't trigger on Z Home:
By the way, where are you guys located?
Canada as well. Saskatchewan.
@vistalert said in Duet3 BLTOUCH3.1 Probe deploys but doesn't trigger on Z Home:
Also, if I execute M401, and periodically, and briefly, tap the probe with my finger, the Z sensor in DWC always shows 0.
This is to be expected. Sending M401 will just deploy the servo pin. So poking the pin in this state won't cause anything to register as triggered. Only when G30 is sent does the firmware deploy the probe, move the axis, and wait for a trigger signal. Even so, the trigger pulse from the BLtouch is incredibly short and then resets when the pin is pulled back up. This combined with the web interface being unable to update fast enough means that with a BLTouch you'll rarely see the status change to 1000 even in normal operation.
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@Thalios yeah - M401 / M402 both deploy/retract.
I'll try G30. I've been clicking HOME Z in the DWC UI with the following in homez.g
; homez.g
; called to home the Z axis
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; generated by RepRapFirmware Configuration Tool v3.1.4 on Tue Oct 20 2020 23:24:46 GMT+0800 (Australian Western Standard Time)G91 ; relative positioning
G1 H2 Z5 F6000 ; lift Z relative to current positionG90 ; absolute positioning
G1 X250 Y250 F6000 ; go to first probe point
G30 ; home Z by probing the bed; Uncomment the following lines to lift Z after probing
;G91 ; relative positioning
;G1 Z5 F100 ; lift Z relative to current position
;G90 ; absolute positioning -
@Phaedrux definitely looks like I should be testing with G10 not G28 Z
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Well G28 Z calls homez and your homez contains a move to position the probe and then does a G30 to probe the bed, so that's a fine way to test.
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actually, my deployprobe.g has:
M280 P0 S10 ; deploy BLTouchand retract:
M280 P0 S90 -
@Thalios - ditto for me too. Same commands in deploy/retract.
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@Thalios out of interest - what is your printer spec? Home design/build?
Mine is Rat Rig VCORE pro / linear rails / triple z screws.
Volcano hot end, titan aero extruder.Interested to know for when I do finally reach bed calibration.
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Railcore II 300ZL fully upgraded, duet 3 6HC, enclosure, E3D V6 Gold because I prefer it to the Mosquito.
I have a D3 on a Ender 3 Pro and a Tronxy X5SA-500 Pro. I have a Duet 2 Wifi on a frankenstein Tevo Tarantula that I home built to 330x330x300 with E3D V6. I'm waiting on the Duet 3 mini to go in my other Ender 3 Pro.
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@vistalert said in Duet3 BLTOUCH3.1 Probe deploys but doesn't trigger on Z Home:
G30 same outcome, bed doesn't stop.
I'd be inclined to connect the BLtouch directly to the board pins without extension and test on the bench (keeping the bltouch vertical) to see if it's in fact a poor connection with the white trigger signal wire.
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I was looking at your Config.g file.
2 things I see different from mine:
You have a endstop configured for Z. Can you try to take that off? (M574 Z1 S2)
and the "^" in the probe type (M558).
Just to see if that solves it.
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Did you do a full continuity test from the multipin connector on the BLtouch all the way to the connector on the board to see if it follows through on all pins with no shorts?
