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Just got a Creality Ender 3 V2, and I am interested in BL Touch

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  • #16
    Originally posted by Peter View Post
    Despite having a glass bed, I see the z-axis raising and lowering as it's printing.
    I have wondered about this. I have also wondered if this kind of action is an indication that the BL Touch is not as accurate as one would hope.

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    • #17
      Originally posted by Peter View Post
      Despite having a glass bed, I see the z-axis raising and lowering as it's printing.
      Sure you did not enable z-hopping? Recent cura seems to have it enabled by default. Sensor related compensation should be so tiny that you could not see it, as it is usually a fraction of a millimetre. You should see the motor turn 1/32 to 1/256 of a rotation or so, when adding a flag to a coupler, but not the bed itself.

      The sensors also are not perfect and add tolerances and error margins depending on the quality. If you pick the same position 10 times without moving the head you probably get 10 different z values from the sensor. Now the printer software may add more error by moving between the measuring points while printing.

      When using such sensor, I would clean by print bed, perform the scan of the print area and *store* the data inside the printers flash. The bed will not bend differently, so there is no need to get a "random" bed levelling on each print. It also takes far to much time in my opinion. Sometimes the sensors get filled with air spread filament dust, causing the sensors to fail more and more over time. I would rather go for a metal detecting sensor than a picking type one to avoid dust related sensor faults.

      Also a tiny filament crumb or other stuff can trigger the sensor early.

      I am using boro silicate glass sheets on two of my printers and a huge picture frame glass on my big printer and no issues at all.

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      • #18
        Geit: question for you: can a metal sensing ABL work with the aluminum printbed, even though there is a magnetic rubber layer on top of it, and a layer of glass on top of that? Is the distance too far for the sensor in your experience?

        A 2nd question: I thought sensors like the EZABL worked of capacitance, rather than metal sensing. Yes, no?

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        • #19
          Originally posted by Ender5r View Post
          Geit: question for you: can a metal sensing ABL work with the aluminum printbed, even though there is a magnetic rubber layer on top of it, and a layer of glass on top of that? Is the distance too far for the sensor in your experience?

          A 2nd question: I thought sensors like the EZABL worked of capacitance, rather than metal sensing. Yes, no?
          Yes, magnetic sensors work with a aluminum bed, but it needs to be mounted closer to the bed. I had a 2mm picture frame glass on top of my Anet A8 aluminum bed and such sensor on it (when I was new to 3D printing and did not know any better, I ordered it along with the printer), which worked fine. After installing a 3mm boro silicate glass the sensor failed detecting anything.

          I have no idea how EZABL sensors work internally.

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          • #20
            I just found this article about ABLs: https://toms3d.org/2017/03/02/autole...ensors-tested/. I think it's interesting.

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            • #21
              Not sure about the cura setting, I'll have to check. As far as installing the BL Touch goes, I felt I needed it to get a better print. I would try to level the bed, and the corners were not level with the center. I plan on printing something that is roughly 200mm², and I figured I needed it after watching Mr Shapiro's BL Touch video, not out of laziness.
              Last edited by Peter; 10-02-2020, 03:20 PM.

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              • #22
                Originally posted by Geit View Post

                Sure you did not enable z-hopping? Recent cura seems to have it enabled by default.
                Is "z-hopping" called something else? That didn't come up in the search.

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                • #23
                  I think I ran into this a while back. You have to make Z hopping visible before you can do anything with it. Let me have a quick look:

                  Yes, click the Settings menu and select the 3rd option, Configure Setting Visibility. In there you can opt to make all settings visible.
                  Last edited by Ender5r; 10-02-2020, 05:39 PM.

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                  • #24
                    Originally posted by Ender5r View Post
                    I think I ran into this a while back. You have to make Z hopping visible before you can do anything with it. Let me have a quick look:
                    That is not required. You can just type in "z-hop", "at retract" or "on retract" into the search field above settings and it will show up temporarily. They activated "z-hop on retract" by default it seems. I am using the German translation here, so I just guess what it is. Just "Retract" should bring that option up to front for sure.

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                    • #25
                      Originally posted by Geit View Post

                      That is not required. You can just type in "z-hop", "at retract" or "on retract" and it will show up temporarily. They activated "z-hop on retract" by default it seems. I am using the German translation here, so I just guess what it is. Just "Retract" should bring that option up to front for sure.
                      Ah. I was assuming, since he couldn't find it by searching, that it had to be made visible.

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                      • #26
                        Thanks, I'll look for it.

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                        • #27
                          Found it, no dash, "z hop when retracted". Not Enabled.

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                          • #28
                            Originally posted by Peter View Post
                            Found it, no dash, "z hop when retracted". Not Enabled.
                            There are other options related to z-hop. At least one global enable and a z-hop on travel AFAIR.

                            Anyway it would be strange if the z movement all comes from the bed levelling.

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                            • #29
                              Originally posted by Peter View Post
                              Found it, no dash, "z hop when retracted". Not Enabled.
                              As Geit said, there are other Z options; quite a few in fact. In the Configure Setting Visibility, try just searching for Z alone.

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                              • #30
                                I found the z hop options, they aren't enabled.

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