BLTouch working
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I just noticed that in your HomeZ.g you do not deploy or retract.
it is not necessary because the firmware does it automatically when G30 is called. but I have tried it with the deploy and retract code but did not make any difference.
I have now just tried to do a mesh levelling using the DC42 IR Probe and this was the result;
I have a aluminium heat bed painted black and with a 6mm sheet of glass on top of it so it is 100% flat. I dont know why I keep get this results with the BLTouch and the IR Probe. any idea? -
just did a mesh grid using the BLTouch and another with the DC42 IR Probe. can anyone help with it?why both of then are giving bad results?
BLTouch
DC42 IR Probe
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How is your bed mounted, is the movement smooth or staggered at low and fast speed
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The IR probe results have one corner point much lower than the rest. There must be something in that corner to cause that, or perhaps you are probing too close to the edge.
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It is a Modified D-Bot with 3 x T8 rods its pretty solid. and the heat bed is a 6mm sheet of glass over a aluminium plate painted black.
it is probing at least 50mm away from the edges.
I am doing some tests now with the DC42 IR Probe it seems to be more reliable than the BLTouch.
got this result doing a probing in just 1 point with this settingM558 P1 X0 Y0 Z1 H5 F120 T12000 ; Set Z probe type to unmodulated, the axes for which it is used and the probe + travel speeds
G31 P200 X0 Y0 Z1.4 ; Set Z probe trigger value, offset and trigger heightM98 P0:/macros/BLTouch 20 probing 1 point
Bed probe heights: -0.657 -0.660 -0.660 -0.655 -0.657 -0.657 -0.655 -0.660 -0.657 -0.657 -0.662 -0.662 -0.655 -0.657 -0.660 -0.655 -0.652 -0.662 -0.657 -0.657 -0.660, mean -0.658, deviation from mean 0.003Now I will do a G29 and see if it is consistent with this result.
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Just did a G29 and got this with the IR Probe
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Hello ALL !
I'm using DUET 0.6 and TLTouch sensor from aliexpress. It's clone of BLTouch.
While sensor is triggered with 240 ohm resistor, output value is 1.3 v. it's low level and not worked!
After i install 560 ohm resistor then output voltage becomes 2 v and it is a hi level and now work fine.
I wrote this information may be it's help anybody who use TLTouch sensor.Thank's for all, and bye!
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The IR probe results have one corner point much lower than the rest. There must be something in that corner to cause that, or perhaps you are probing too close to the edge.
hey dc42. I have a bltouch smart and doing mesh bed compensation on duet wifi. Why is my z-axis not moving like in the video on the first page of this thread? Does mesh bed compensation and autobed compensation cause different z-axis behavior? I also have two steppers in the z-axis connected to ZA and ZB on the duet wifi board. lmk, thanks.
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hey dc42. I have a bltouch smart and doing mesh bed compensation on duet wifi. Why is my z-axis not moving like in the video on the first page of this thread? Does mesh bed compensation and autobed compensation cause different z-axis behavior? I also have two steppers in the z-axis connected to ZA and ZB on the duet wifi board. lmk, thanks.
How is it behaving then?
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hey dc42. I have a bltouch smart and doing mesh bed compensation on duet wifi. Why is my z-axis not moving like in the video on the first page of this thread? Does mesh bed compensation and autobed compensation cause different z-axis behavior? I also have two steppers in the z-axis connected to ZA and ZB on the duet wifi board. lmk, thanks.
How is it behaving then?
It stays stationary unless there is a layer change. What I noticed on the other video is that the z-axis steppers would move back and forth based on compensation needs. Does this mean my bed is just perfectly leveled (highly unlikely)?
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I fear I may have messed up! I think I have had my BLTouch connected with a 10ohm resistor instead! Could I have damaged something? I have recently rebuilt the printer and when testing the BLTouch will not self test or fire. It does reset but nothing else? I am picking up some new (240ohm metal film) resistors tonight to replace the current (wrong) one.
Have I screwed my board?
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It's unlikely that you have damaged the Duet.
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It's unlikely that you have damaged the Duet.
It should also be unlikely that I have damaged the BLTouch. So I am guessing that hopefully replacing the resistor will work. Odd as it worked for a year with that 10ohm resistor! Unless I need to adjust the pin? Hmm.. replace the resistor first, and fiddle with the pin after.
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New resistor and now have 2.9v but still have the same issue. The BLtouch does not retract the pin. Also does not run the self test at start up. Hmm??
So, triple checked all wiring. That is all fine.
Probe fires using g-code but won’t retract.
Does not run startup routine.
Will not run self test.
3.3v measures 3.21v
5v measures 4.86v
Vin reading is 24v
Any idea?
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Ok here we go! Problem solved! Turns out it was the proximity of the sensor to the stepper motor. Must be the magnets messing with each other! Move it away works perfectly set it to test mode and put it by the motor and poof, nothing works! Going to have to figure out an alternative mounting position!
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Woohoo, i'm 99% of the way there. My issue is that during G29 mesh levelling, it ..
deploys probe,
lowers bed,
triggers,
raises the nozzle and simultaneously deploys the probe again.I was expecting it to only drop the probe after it has finished raising.
Also, what controls the XY speed during homing?
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The M558 F parameter controls the speed of probing, and the T parameter controls the speed of travel moves between probe points.
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Thanks, what is causing the probe to drop before the head has moved completely out the way?
Also my bed is 300 x 300. I want to probe 4x4 points. Does this look correct?
M557 X20:280 Y20:280 S65
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I just got my BL Touch installed on my duet wifi, followed the instructions on here and another topic. I just have a question as my probe reads 1000 all the time and not 0 ever. I can successfully deploy and retract pin, and the pin retracts when I lightly touch it.
Is there anything else you need?
here is my config section for bltouch, I've not yet set the offsets as I've not yet mounted an extruder as I'm still building my hevo.
M307 H3 A-1 C-1 D-1 ; This is for BLTouch
M558 P5 X0 Y0 Z1 H5 F100 T2000
G31 X0 Y0 Z0 P25 ; Change the x and y for the offset of the sensor in relation to the nozzle and set z offset as normal too.Thanks and look forward to your help
Curtis -
Two likely possibilities:
1. You are using a Duet 0.8.5 and not running the latest firmware, so Z probe mode 5 doesn't work. Upgrade your firmware to 1.20.
2. The output wire of the BLtouch (which is the white one AFAIR) isn't connected to the pin labelled IN on the Z-probe connector of the Duet.
