BL Touch Settings Question

[wmyhal]

Hi

I'm using BL Touch bracket from https://www.thingiverse.com/thing:4563093
I am using the smith3D firmware on my Ender 3 v2

Do I need to add M851 X-39 Y-7 to my Start Code. And if so does it go before the G29 ;?

This is what I have in my Start Code:

M851 X-39 Y-7 ; BLTouch bracket Offset
G29 ; ABL - BLTouch




The summary for the print is as Follows

Summary

Compact BL Touch mount for the Ender 3 V2

Initial version (my preference, unless you use the Creality firmware and don't want to update the offset):

Offset X = -39, Y = -7

Version with correct offset for Creality firmware:

Offset X = -45, Y = -20

There are two ways to set the X and Y offset:

Add M851 X-39 Y-7 to your start G code
Use Pronterface to execute the exact same command, followed by M500 so that the new offset is stored in the Eprom

[Ender5r]

OK, I only just got my BLT working, so I'm hardly an expert. That said, my understanding is that once you input the offsets & then issue an M500 command to store the settings, then you don't need it in the g-code.

[Larry]

Hi

I'm using BL Touch bracket from https://www.thingiverse.com/thing:4563093
I am using the smith3D firmware on my Ender 3 v2

Do I need to add M851 X-39 Y-7 to my Start Code. And if so does it go before the G29 ;?

This is what I have in my Start Code:

M851 X-39 Y-7 ; BLTouch bracket Offset
G29 ; ABL - BLTouch




The summary for the print is as Follows

Summary

Compact BL Touch mount for the Ender 3 V2

Initial version (my preference, unless you use the Creality firmware and don't want to update the offset):

Offset X = -39, Y = -7

Version with correct offset for Creality firmware:

Offset X = -45, Y = -20

There are two ways to set the X and Y offset:

Add M851 X-39 Y-7 to your start G code
Use Pronterface to execute the exact same command, followed by M500 so that the new offset is stored in the Eprom

Yes you will need to they intended for you to use this mount https://www.thingiverse.com/thing:4462870 which has X, Y offsets of X-42.00 Y-10.00 which they built into the firmware. The mount you selected uses X = -39, Y = -7 so you will need to send the gcode commands to your printer at the beginning of your start code otherwise the firmware will use what smith3d programmed in. Or you could just swap the mounts to the one they suggest you use.

[Ender5r]

Larry, thanks for the info; it's interesting. I ran into something similar very recently when trying to override the default ABS Preheat settings in TH3D firmware. I found I had to reset the EEPROM before flashing the modified firmware. Is that an option with the smith3D firmware?

[wmyhal]

Yeah using the bracket that Smith3D suggests requires that the Guide wheel bolt be used to hold it in place. This bracket has the holes that screw to the plate.
I measured the bltouch pin to the nozzle and it is 39mm.

[Ender5r]

Looking at those bolts, I can't help channeling Ryan Reynolds, "Whoa! Easy.... e-a-s-y!" All kidding aside, I presume they're what you had available.

[wmyhal]

The vertical Bolts? They came with the BL Touch.. lol
A bit long

[Ender5r]

Yeah, the ones holding the BLTouch itself

[Larry]

Not seeing anything about that in there info on there site

[wmyhal]

I have another question
In the BLTouch package there are 2 springs.
Needless to say there was no instructions and I don't know what they are for.

[Ender5r]

The metal bracket that came with my Creality BLT kit is held in place using the 2 bolts that hold the fan shroud in place. It has a fairly large hole that fits around the head of the guide wheel bolt.

[Larry]

Here is what mine looks like



Made screw covers for the screws and found a cover for the BL Touch on thingiverse

[Ender5r]

I have another question
In the BLTouch package there are 2 springs.
Needless to say there was no instructions and I don't know what they are for.

My Creality kit didn't come with springs. The only thing I could think they would be for is to act as a cushion to protect the BLT probe. Maybe they're supposed to mount between the top of the BLT and the bottom of its bracket, much like the printbed springs. I would be a little concerned about accuracy with that arrangement, but it might account for the length of the bolts. It might also be to adjust the height of the BLT probe, to get it the same height as the nozzle, or close to it.

[Larry]

I have another question
In the BLTouch package there are 2 springs.
Needless to say there was no instructions and I don't know what they are for.

The springs are to allow some movement for the BL Touch in case the probe is pushed into the bed to hard which could damage it if the springs aren't in place but was told it can cause incorrect proble measurments so i didn't install them myself. That's why the screws are so long it allows for the springs which i understand hardly no one uses.

[wmyhal]

Ok Thanks
I was thinking that was what they were for