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  • BL Touch Settings Question

    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

  • #2
    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.

    Comment


    • #3
      Originally posted by wmyhal View Post
      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.

      Comment


      • #4
        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?

        Comment


        • #5
          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.

          Click image for larger version

Name:	BLTouch.png
Views:	34
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ID:	6757

          Comment


          • #6
            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.

            Comment


            • #7
              The vertical Bolts? They came with the BL Touch.. lol
              A bit long

              Comment


              • #8
                Yeah, the ones holding the BLTouch itself

                Comment


                • #9
                  Not seeing anything about that in there info on there site

                  Comment


                  • #10
                    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.

                    Click image for larger version

Name:	BLTouch-Pack.png
Views:	36
Size:	288.7 KB
ID:	6763

                    Comment


                    • #11
                      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.

                      Comment


                      • #12
                        Here is what mine looks like

                        Click image for larger version

Name:	bltouch cover.PNG
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Size:	252.0 KB
ID:	6766

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

                        Comment


                        • #13
                          Originally posted by wmyhal View Post
                          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.

                          Comment


                          • #14
                            Originally posted by wmyhal View Post
                            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.

                            Click image for larger version  Name:	BLTouch-Pack.png Views:	0 Size:	288.7 KB ID:	6763
                            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.
                            Last edited by Larry; 12-01-2020, 02:41 PM.

                            Comment


                            • #15
                              Ok Thanks
                              I was thinking that was what they were for

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