Ender 3 RRF v1.1 setting up BLtouch

[re_tour]

@stephen6309 I have this in bed.g:

; bed.g
; called to perform automatic bed compensation via G32
;
; generated by RepRapFirmware Configuration Tool v3.3.1-LPC-STM32+2 on Tue Dec 28 2021 01:07:55 GMT+0100 (közép-európai téli idő)
M561 ; clear any bed transform
G29  ; probe the bed and enable compensation

[Gixxerfast]

@re_tour Great!! I always get that the other way around.

If you're happy with your mesh grid go for it

You will have to make the file yourself.

[Gixxerfast]

@re_tour G32 and bed.g is for gantry/bed leveling. G29 and mesh.g is for the bed mesh.

In earlier vesrions of RRF I think mesh-g didn't exist so therefore a lot of people still uses bed.g with the G32.

Anyhow, the Ender can't level gantry or bed automatically since it only has one z-motor

[re_tour]

@gixxerfast Oh right, so I can only use the bed mesh anyways.

Okay so I modified the config.g a little bit:

M557 X30:190 Y30:190 P5                       ; define mesh grid

and copied your mesh.g, in which I presume I'll have to measure the distances with a ruler or something?

[Stephen6309]

@re_tour That will work fine. I have the if statements make sure it's homed and load the height map. Also, I clear the baby stepping, since I update a macro I call to set the Z offset.

[Gixxerfast]

@re_tour Yes, if you don't already know them. Usually mounts have a them in the description/documentation. It's not very precise so ruler works.

As said above, it's probably wise to add this to the top of your mesh.g

if !move.axes[0].homed || !move.axes[1].homed || !move.axes[2].homed
 G28
M290 R0 S0    ;  clear baby stepping

But then you should be ready to go

[re_tour]

@gixxerfast Thank you. Lastly, how do I measure these:

var xoffset = 37.1
var yoffset = 9.25
var xpos = {110 - var.xoffset}
var ypos = {117.5 - var.yoffset}

I mean in relation to what from what?

Also, what kind of bltouch holder do you have? Maybe we have the same which would mean the numbers are mostly correct

[Gixxerfast]

@re_tour I have the Voron Afterburner, so probably not. But I have my probe to the right and behind the nozzle seen standing in fron of the printer.

Should be the same numbers you have in your G31 command

<-------- 37.1 ------->
                      x   ^
                           |
                        9.25
                            |
o                         ---

[re_tour]

@gixxerfast Okay, so measured up I now have the following mesh.g:

if !move.axes[0].homed || !move.axes[1].homed || !move.axes[2].homed
 G28
M290 R0 S0    ;  clear baby stepping

G29 S2
 
; move to the center of the mesh with the PROBE (mind affset in Y is 25 above noozle)
G90
var xoffset = 44
var yoffset = 18
var xpos = {117.5 - var.xoffset}
var ypos = {117.5 - var.yoffset}
 
G1 X{var.xpos} Y{var.ypos} Z15 F6000
 
echo "Setting Probe Offset now"
G30 K0
G1 Z15 F3000
G29 S0

In which the xpos and ypos is the same as this line in the config.g file:

G31 P500 X117.5 Y117.5 Z3.55                      ; set Z probe trigger value, offset and trigger height

What is the next step from here?

[Gixxerfast]

@re_tour said in Ender 3 RRF v1.1 setting up BLtouch:

G31 P500 X117.5 Y117.5 Z3.55

No, this must be wrong

Shouldn't it be:

G31 P500 X44 Y18 Z3.55

?

[Gixxerfast]

@re_tour When all of this is done. Heat your bed to the standard temp and the home all with

and run mesh compensation:

The you should have a mesh file which you can look at with:

[re_tour]

@gixxerfast

To be honest for some reason I set that number at the start after browsing through reddit. Since you have the same printer, what is it for you?

Btw just to clarify,

var xoffset = 44

var yoffset = 18

This is measured from the sensor to the nozzle, right?

[Gixxerfast]

@re_tour said in Ender 3 RRF v1.1 setting up BLtouch:

This is measured from the sensor to the nozzle, right?

Yes, You have my offsets up there but OK:

var xoffset = 37.1
var yoffset = 9.25

As said, I have my probe to the right and behind the nozzle. Most stock Enders usually have it to the left (negative number) and on par y wise (as far as I can remember).

[Gixxerfast]

@re_tour Which toolhead do you have, stock or custom?

[re_tour]

@gixxerfast Stock, and my bltouch is to the left from the nozzle. Here is the link to it.

so, what do these numbers represent in G31 and how do I set them to be correct?

G31 P500 X117.5 Y117.5 Z3.55                      ; set Z probe trigger value, offset and trigger height

[Gixxerfast]

@re_tour
Try this and see:

G31 P500 X-44 Y-18 Z3.55

It should be the same you had in Marlin when it worked before the RRF was installed

[re_tour]

@gixxerfast But I didn't have marlin It was full stock before.

[Gixxerfast]

@re_tour said in Ender 3 RRF v1.1 setting up BLtouch:

But I didn't have marlin It was full stock before.

Yes, but fully stock is with Marlin firmware. But maybe you didn't have the BLTouch then?

[re_tour]

@gixxerfast Nope, just after I upgraded the board.

[re_tour]

@gixxerfast What I'm having trouble understanding is the following:

var xoffset = *probe distance from nozzle on x axis*
var yoffset = *probe distance from nozzle on y axis*
var xpos = {*value at G31 X* - var.xoffset}
var ypos = {*value at G31 Y* - var.yoffset}

How do I know what the correct "value at G31" for X and Y are?