New IR z probe issues

agent0810

@fcwilt
so if im currently at
G31 P500 X50 Y0 Z1.501

and my current offset was 1 mm that i had to move the nozzle away from the bed. i need to decrease the Z from 1.501 to .501?

so

G31 P500 X50 Y0 Z.501?
i am fairly positive that i have tried that and it didnt work

Phaedrux

A larger G31 value results in the nozzle being closer to the bed.

fcwilt

@agent0810 said in New IR z probe issues:

@fcwilt
so if im currently at
G31 P500 X50 Y0 Z1.501

and my current offset was 1 mm that i had to move the nozzle away from the bed. i need to decrease the Z from 1.501 to .501?

so

G31 P500 X50 Y0 Z.501?
i am fairly positive that i have tried that and it didnt work

If you use baby stepping to move AWAY from the bed then the trigger height setting must be decreased.

If you're numbers are correct then that value is correct.

You can always determine the trigger height setting through trial and error, adjusting it up or down with G31, setting the Z=0 datum with G30 and repeating the process until moving to Z=0 has the nozzle just touching the bed.

Frederick

agent0810

@fcwilt
what is the P value in this line?

Phaedrux

trigger sensitivity.

agent0810

@fcwilt

i am not sure what i am doing wrong. i set it to the .501 and its still to far from the bed, filament isnt sticking. im not sure where to go from here. since it was to far away i lowered it to 0 and its still to far away.

Phaedrux

@Phaedrux said in New IR z probe issues:

A larger G31 value results in the nozzle being closer to the bed.

If it's still too far away you're going in the wrong direction. Instead of 0.5 you would need to add to the value, so 2.5.

droftarts

@agent0810 Think of it this way; when the probe triggers, it sets the Z height to the Z offset. So when it triggers, it sets Z to 1.5mm. If you then move the bed up to Z0, the nozzle should be touching the bed. If it's still away from the bed, the Z offset needs to increase. From your numbers, it should probably be around Z2.5.
There is also a guide to do this: https://duet3d.dozuki.com/Wiki/Test_and_calibrate_the_Z_probe#Section_Calibrate_the_Z_probe_trigger_height

It may make a difference where you probe the bed. If you're homing over in the corner (and make sure the probe is homing over the bed if you do), then moving to the centre to print, it could be if your bed is not level, and the corner is lower or higher than the centre. You can check this manually (move the nozzle around to the corners of the bed, manually adjust bed level), or by getting mesh compensation going (https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation) and looking at the mesh it creates. You can also do three point levelling manually, if you have bed adjusters; see https://duet3d.dozuki.com/Wiki/Using_the_manual_bed_levelling_assistant

Ian

jumpedwithbothfeet

@agent0810 I have an ender 5 and i have had exactly the same issue, its enough to drive you mad! but any way it seems if you follow this process exactly it helped me sort it out.

Important do NOT home the Axis's until the list tells you too!

Turnoff printer!
Turn on and go straight to config.g and change G31 Z to 0
save and reset board
heat bed to what ever temp you normally use and wait for it reach it (this is important on the ender 5 as the bed support is poor)
Heat nozzle to your most used temp and wait!
once both are heated now home all axis's ( i use the middle of the bed)
Jog Z to zero ( the nozzle should be well off the bed)
type M564 S0 into the console this will disable the axis limits
jog nozzle down until it touches the bed or paper which ever you prefer
type G92 Z0 into the console this resets the Z axis height
turn nozzle heater off (can affect the BLtouch touch sensor reading not sure regarding IR sensor)
now type G1 Z5 followed by G30 S-1 to do a single bed probe i made a macro to do this it helps!
probe the bed at least 5 or more times and go to the console and take the average trigger height.
save the trigger height in config.g G31 Z then the reset board and print! well after G29 that is

i'm sure you have carried out all these steps but it seems its the sequence that works, hope this helps!

Regards Jim

agent0810

Thank you for the reply! I appreciate all your guys help! I did exactly as you said and I’m still having issues. The back(furthest from me) is to high, the nozzle pushes up against it and no filament comes out. The side closest to me is a little to low, the filament doesn’t stick, thinking about putting some tin foil below the front to raise my glass bed up a bit in the front. Thoughts?

Phaedrux

Getting a good mechanical level to start with is always preferred.

agent0810

@Phaedrux does that mean you think the tin foil under the glass bed is a good idea? Thank you!

jumpedwithbothfeet

@agent0810 have you tried printing out some bed supports you can find these on Thingiverse I have some fitted to my bed and it helps, I would also not use Foil under your glass plate, shiny things and IR probes don’t mix! I have literally just got back from screwfix with some high temp black paint for my bed plate

This what I have fitted to my ender, if you can even get on Thingiverse at the moment seems the site has gone c@£p again

https://www.thingiverse.com/thing:3661405

Regards Jim

agent0810

@jumpedwithbothfeet

Hmmm I have tried and I can’t get a good first layer to print them

jumpedwithbothfeet

@agent0810 couple of questions....have you used hairspray etc on the bed? What does the height map look like maybe a screen shot? And when you probe the bed multiple times what do the readings look like?

Regards Jim

agent0810

@jumpedwithbothfeet

I have not used anything on my beds, before trying to get this IR blaster working i was having awesome adhesion and first layers.

I have not done a heat map, ill look up how to do that.

Here are my readings from yesterday:

7/27/2020, 8:02:35 PM Connection established
7/27/2020, 8:02:20 PM Connection interrupted, attempting to reconnect...
HTTP request timed out
7/27/2020, 8:02:10 PM Upload of config.g successful after 0s
7/27/2020, 8:01:37 PM G30 S-1
Stopped at height 0.195 mm
7/27/2020, 8:01:23 PM G1 Z5
7/27/2020, 8:01:14 PM G30 S-1
Stopped at height 0.196 mm
7/27/2020, 8:00:58 PM G1 Z5
7/27/2020, 8:00:45 PM G30 S-1
Stopped at height 0.195 mm
7/27/2020, 8:00:25 PM G1 Z5
7/27/2020, 7:59:46 PM G30 S-1
Stopped at height 0.192 mm

Phaedrux

@agent0810 said in New IR z probe issues:

I have not done a heat map, ill look up how to do that.

G29

Here are my readings from yesterday:

Those look quite good.

agent0810

@Phaedrux
Tried the G29 and the head moves to the front left corner (closest left corner to me) and errors out. im guessing the error is because the probe is on the left of the head so its not over the bed to be triggered.

7/28/2020, 3:24:43 PM Error: Z probe was not triggered during probing move

Phaedrux

Yes you'll need to modify your M557 command to keep the probe within the bed area bearing in mind the probe offset. That is to say, you need to position the nozzle so that the probe is in the right place.

agent0810

@Phaedrux

M557 X15:215 Y15:195 S20 ; define mesh grid

that is what my currently, what do you recommend changing it to?