IR Height Sensor

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  Guide for posting requests for help
  • T3P3Tony

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  Z endstop and DC42 IR sensor. First layer
  • Rina

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  @Rina, I suggest you remove the G92 Z commands from your homeall.g and homez.g files, and instead set your max Z in M208 to 259.35.
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  IR Probe being overly sensitive?
  • richw

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  We've see that behaviour with a small number of new IR sensors, and recently I've changed the firmware to make it less likely to happen. But if the sensor has been working well for nearly 2 years and you haven't changed the bed surface, then the change might be caused by contamination of the optical components. Try cleaning them with a cotton bud moistened with isopropanol. If you are in the UK then I can reprogram your sensor with the new firmware if you like. If you are outside the UK then the postage probably makes that uneconomical.
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  IR Probing Issue always showing values around 990 to 1000
  • Pradeepkumar

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  Z Height
  • Dqtreats

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  You've not said what IR sensor you are using. Some are strongly influenced by ambient IR light, be that clouds moving and soaking your machine in sunlight or turning on and off a halohen/filament desk light. Edit: Just seen M665 relates to delta machines. Want one, but don't have one so I'll leave you lot in peace now!
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  Change the z offset via gcode
  • CR3D

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  You could use a macro that automates measuring the G31 z offset using G30 S-3 and use M500 P31 to save it to the config-override. https://duet3d.dozuki.com/Wiki/Gcode#Section_G30_Single_Z_Probe https://duet3d.dozuki.com/Wiki/Gcode#Section_M500_Store_parameters
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  IR Probe Z-Offset to big???
  • CR3D

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  Ok... i want to report the results... After I changed the IR Probe... the error was gone .. Thank you dc42! Sometimes there is a little error between the measurements... I think I should slow down the speeds...
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  BLTouch nonsense
  • Andy Cohen

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  when you reinsert the pin start the self test and adjust the grub screw so that it can deploy and retract correctly.
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  SOLVED NPN Probe and Error: M280: Invalid servo index 3 in M280 command
  • Worelock

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  Great! Now you can mark this thread as solved
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  Mesh Bed Compensation woes...
  • Credo

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  That was exactly the issue. the white rhino logo on the bed had a different effect on the compensation process. Thank you! Now I have to look for a bed with a solid color. Time to spend on a BuildTAK surface. Ho-Hum.
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  Printing on surfaces or objects.
  • cookie

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  Define probe offset from extruder.
  • MKR2

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  @devleon Thank You !
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  IR sensor configuration
  • mrcrow

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  @mrcrow I am using an ir sensor with glass I tried black paper and it didn't work that well, I switched it out for cheap matt vinyl vehicle wrap stuck to the bed then covered with the sheet of glass, that is working a treat.
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  IR Trigger height suddenly changed a lot
  • JKaechler

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  Is your IR sensor the older sort with through-hole phototransistor and IR diodes, or the new sort with surface mount ones? If it's the older sort, then you have probably had a collision and one of those components has been bent into a different position. If it's the newer sort, then perhaps it has developed a fault.
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  z-homing failed with mini IR
  • gueee78

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  @gueee78 said in z-homing failed with mini IR: Error: Probe points P0 to P1 must be in clockwise order starting near minimum X and Y That message means that the firmware thinks you want to do old-style bed compensation. It should only do that if the number of leadscrew coordinates you defined in M671 doesn't match the number of Z motors defined in M584. So try running M584 without parameters, and M671 without parameters, and report the results.
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  Mini IR height sensor Setup: Z-probe value at a "long" distance
  • FelixH

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  @dc42 said in Mini IR height sensor Setup: Z-probe value at a "long" distance: What firmware version are you using? The M558 X Y and Z parameters have been ignored since many versions.
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  IR probe values wrong (SOLVED)
  • planeguy

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  @planeguy, I'm glad you solved it.
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  running a duet wifi with a dc42 ir
  • LARRY

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  Check your M558 if it is correct in your config.g -> H0 ??? I can only tell you how it works for me and it does it without any problems: First I have homed my printer in all axes, where I have the endstops X min, Y min and Z max -> so my config.g = "M574 X1 Y1 Z2 U2 S1" (is built differently for you, so configured differently ). also i do NOT use my mini-ir as z endstop Then I determined the distance with the procedure drive the bed to center and Z about 10mm -> check indicator "probe" in the DWC (must be 0!) manually move carefully in the direction of Z0 -> display "probe" in the dwc must indicate a value of about 465 when the nozzle come closer to the bed drive further in the direction of Z0, the "probe" value must indicate about or over 535 (now your nozzle has only a little distance to the bed) drive the bed back to approx. Z10 Send M558 P1 send G31 P500 Z1.0 manually push the printhead into the middle of the bed manually approach Z0 with paper set Z0 with G92 Z0 drive to bed position with G91 Z5 take the measurement with G30 S-1 (note: this value should be between 0.5 and 2.5!) now send G31 P500 Zxxx (xxx= the value which is shown at the G30 S-1 command and write it in your config.g too!) write the corect M558 in your config.g
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  IR Sensor loosing precision over time?
  • PDBeal

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  @dc42 I recently discovered that my IR probe starts behaving as if it's in digital mode after a while if i'm printing in an enclosure and/or the hotend is hot for enough time for the probe to warm up. And that's even though it boots as analog. The z probe is approx. 20mm away from the nozzle (probably 10-15mm away from heatblock with a silicone sock)..and I don't think the enclosure gets warmer than 40-45 deg.
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  Cover for IR Height Sensor. Where don't work the Sensor?
  • FBG

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  I'm not sure that any transparent material at all will work, because you will get reflections from both surfaces. If you want to try it, I suggest you try a piece of thin acetate sheet (like the stuff that used to be used with overhead projectors) placed right against the IR diodes and phototransistor.