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Problem with the auto bed leveling (IR probe)
Der_Muck
Posts: 265🌟 Super Member 🌟
Hello everyone,
I am Chris from Austria and I have some problems with the funktion of my IR probe on my A5.
Everything is working but when my probe does a measurement I got for example that:
For example now on the left front the nozzle is in the high and on the right i crash.... WHY is that so?
I tryed turning off the light and everything but that goesnt change anything...
Can anyone help?
Best regards,
Chris
I am Chris from Austria and I have some problems with the funktion of my IR probe on my A5.
Everything is working but when my probe does a measurement I got for example that:
LESEN: Bilinear Leveling Grid:
LESEN: 0 +0.486 -0.046 -0.089 -0.378
LESEN: 1 +0.040 -0.001 -0.086 -0.044
LESEN: 2 +0.004 +0.094 +0.158 -0.050
LESEN: 3 -0.086 +0.004 -0.115 -0.236
Offset is at Z-3.3 But when I try Z0 in different spots the high is not at 0.2mm as i want.For example now on the left front the nozzle is in the high and on the right i crash.... WHY is that so?
I tryed turning off the light and everything but that goesnt change anything...
Can anyone help?
Best regards,
Chris
Comments
I changed the max of the measurement range to:
and got that result:
LESEN: 0 -0.061 -0.179 -0.092 -0.180
LESEN: 1 -0.080 -0.043 -0.009 -0.185
LESEN: 2 +0.047 +0.077 -0.179 -0.134
LESEN: 3 +0.036 -0.186 -0.021 -0.076
Looks better to meI keep you in touch...
LESEN: 0 -0.060 -0.197 -0.146 -0.074 -0.196
LESEN: 1 +0.006 -0.006 +0.114 -0.035 -0.129
LESEN: 2 +0.082 -0.078 -0.267 -0.095 -0.020
LESEN: 3 -0.039 +0.044 +0.013 -0.092 -0.197
LESEN: 4 +0.039 -0.223 -0.194 -0.063 -0.086
I did not have good results with the IR probe. I think the pattern of the coating on the bed confuses the probe.
I suggest this: put a flat solid (no pattern) sheet on top of the bed, and try again.
I was testing it till 03:00 and it is how you write.
When you go to the trigger high and go in X or Y the probe triggers sometimes because of the gridy surface.
Guys dont go and buy the mini IR Probe for autobed leveling on the black strandard plate, its useless!
@Samuel Pinches a microswitch would be the best but I realy dont know how to set the switch up and down or turn away while printing without loosing accuracy. Next would be the BLtouch. How do you think about it? It would be the easyest way before I experiment with micro switches.
My goal is to measure as exact as passible but is that realistic with such a probe? It must be min. +- 0,05mm accurate otherwise its generally better to do manual bed leveling or standard 5 point leveling, there you can reach easy the +- 0,05mm accuracy. That accuracy would be my max. limit I would like to work.
Greets
I'm sorry, I understand it is frustrating. I tried two different IR sensors, many hours too... I share your pain.
Best regards,
Sam
nah it was no problem. Now I know much more about the system and how it works, I am new in such stuff, just got my A5 3 Weeks ago
I followed your tip and add adress stickers on my beds meassurement positions and also on the Z home position.
It worked this time but it was the same. Some stickers where not so correct and the probe measured near to the edge of the sticker what made the measurement wrong.
But in the end it worked and I have a mash saved.
Can you tell me why the G29 A or the G29 Q doesnt work? Wanted to do a auto bed leveling first and correct it manualy but it turned out thats not passible because G29 always starts the automatic mode and it ignores the A or Q or anything after the G29 http://marlinfw.org/docs/gcode/G029-abl.html
So now I have the mash saved in the eeprom. Does it load the mash after a restart and the first G28? Or do I have to add a code in a script?
Greets
@Samuel Pinches
I used G28; M420 S in Pronterface. Than i got to Z0 and went +-X and +- Y left side is at 0,2mm but when I go right, it scratches at 3/4 on the way.
I think it will not work ever because autoleveling at the beginning doesnt work at all and building a saved mash is maybe ok but when you use your printer next time it turns out that the mash is wrong. Even only with G28 Z homing its better and it doesnt scratch my plate.
Sorry for my english
If you do manual mesh bed levelling, it should work well.
Please note, there are several different auto bed levelling methods, so it is important to read the correct documentation for the method you are using (automatic bed levelling vs unified bed levelling). Adding more confusion, I think there is some difference between firmware versions too...
yeah i did the M420 S to set the saved mash leveling. I strongly think that the mash leveling is inverted.
I reduced the mash points from 5 to 4 rows and add 10mm space on every side because of the bed clamps. When I did it, the mash leveling now begins at the left. Before it began on the right. Is this a sign of a bug and equals in a invertation?
When you look at the last picture you see the middle is about Z0, on the right level point (seen from the front) its +0,140.
When the nozzle is 0,2 and i go right to the 0-2 point, the distance reduces with normal 5 point level.
Than i load the mash, same situation, I go right and the nozzle crashes. Means for me, the leveling goes it the wrong direction.
But all in all, yes I now will go back to the manual bed leveling like you did and when I have time, I will check out the BLtouch.
I work on a fine plasma cutting system in my work. There i have such a probe, in the end, the accuracy will show if its worth it. For me, a mechanical probe makes more sense because its easyer to use and much less error prone. With a IR probe its passible that even fingerprints can result in a wrong measurement.
I now got the BLtouch but I hate the plastic pin and to that, you have to add a flat plate on the pin about 3-4mm diameter because of the black diamond surface. It would be the same problem like the IR probe has.
Only a probe whats about 0.05mm accurate is worth to be used. For now the manual mash bed leveling is without any problem. I try to get the BLtouch heat resistent and get the plate on the tip. Only than its for me usable.
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