About bed leveling & C



  • Good morning, I'm totally confused about the procedures in object....first of all I have to say that my printer mounts a magnetic spring steel plate covered with PEI wich I'll take off from bed to detach the print after every use so when I'll re-put the plate on the bed it's almost impossible for me to get the exact same position than before....so, if I'm not wrong the procedure I have to follow is:

    1. Configure and use the bed leveling assitant with the M671 to give the coordinates of the 6 screws my bed is attached to (X5S chassis)
    2. Run G32 wich should tell me in the end how many mm should I adjust each screw (in console or Display I suppose)
    3. Build a mesh bed compensation with M557 (already setted by the online configurator) and after that with the G29 wich should create a file named /sys/heightmap.csv (the default name for me is ok)

    now the confusion starts to grow for me because here: https://duet3d.dozuki.com/Wiki/Using_mesh_bed_compensation it is written to use G29 S1 and here: https://betrue3d.dk/bltouch-on-duet-wifi-configuratio-and-usage/ it is written to put a G30 in homez.g and homeall.g .... in the last link it is written to insert a G30 (wich probes the Z in a sinlge point only) in the start gcode after that G29 S1 to load my height map....so the question is....shuold I rerun the step 3 EVERY time I remount the steel plate on the bed? With marlin I had no height map memorized and with the G29 command the bed was probed 4x4 points each time...am I right or am I missing somehing? To be honest at now I have no idea if detach and re attach the steel plate will make substantial differences in the height map but I want to understand exactly how things work...

    Thank you guys!
    Andrea



  • make the test.

    do a mesh beg with g29. save the picture.

    take of the sheet
    home and put the sheet back on.
    compare the picture to the previous one.
    if there is a difference then it would be good to level every time.



  • @Veti said in About bed leveling & C:

    make the test.

    do a mesh beg with g29. save the picture.

    take of the sheet
    home and put the sheet back on.
    compare the picture to the previous one.
    if there is a difference then it would be good to level every time.

    ok, thanks



  • HI,

    Putting aside the issue of the spring plate (I myself use the BuildTak system)...

    You want to use G30 at a single point in the center of your bed to set the Z=0 datum...

    • Before you create a height map with G29
    • Before you load an existing height map with G29 S1 (which I do before every print)

    You probably already know that but I wanted to be sure.

    As to the spring plate I have been using just the one existing height map that I create and have been carefully changing the plate between prints.

    I certainly hope that is OK because creating the height map for every print would be really annoying with all the clicking my BLTouch does. My prints have been most satisfactory.


    Just out of curiosity why do you have 6 adjusting screws? I was advised to only have 3 for my 300mm x 300mm bed support plate.

    Thanks.

    Frederick



  • @fcwilt said in About bed leveling & C:

    HI,

    Putting aside the issue of the spring plate (I myself use the BuildTak system)...

    You want to use G30 at a single point in the center of your bed to set the Z=0 datum...

    • Before you create a height map with G29
    • Before you load an existing height map with G29 S1 (which I do before every print)

    You probably already know that but I wanted to be sure.

    As to the spring plate I have been using just the one existing height map that I create and have been carefully changing the plate between prints.

    I certainly hope that is OK because creating the height map for every print would be really annoying with all the clicking my BLTouch does. My prints have been most satisfactory.


    Just out of curiosity why do you have 6 adjusting screws? I was advised to only have 3 for my 300mm x 300mm bed support plate.

    Thanks.

    Frederick

    o,k, thanks! The Tronxy X5S (but I think all the newest X5S models) uses 6 screws to hold the plate wich is 330x330



  • @the_dragonlord said in About bed leveling & C:

    Tronxy X5S

    It's hard to tell from looking at a picture of one but is the bed plate thick enough to be supported by only 3 screws?

    As you likely know 3 points define a plane. If the plate is nice and flat 3 screws are all that is needed to level it.

    Thanks.

    Frederick



  • @fcwilt

    the tronxy 5s is know to be not very stable in itself and needs reinforcement.
    the bed wont be much better than any other standard china bed.



  • @fcwilt said in About bed leveling & C:

    @the_dragonlord said in About bed leveling & C:

    Tronxy X5S

    It's hard to tell from looking at a picture of one but is the bed plate thick enough to be supported by only 3 screws?

    As you likely know 3 points define a plane. If the plate is nice and flat 3 screws are all that is needed to level it.

    Thanks.

    Frederick

    I said 6 not 3....



  • @Veti said in About bed leveling & C:

    @fcwilt

    the tronxy 5s is know to be not very stable in itself and needs reinforcement.
    the bed wont be much better than any other standard china bed.

    Infact I reinforced the whole structure a lot



  • @the_dragonlord said in About bed leveling & C:

    I said 6 not 3....

    Yes I know but 3 are less work to get level.

    How thick is the metal plate on your printer?

    Frederick



  • @fcwilt said in About bed leveling & C:

    @the_dragonlord said in About bed leveling & C:

    I said 6 not 3....

    Yes I know but 3 are less work to get level.

    How thick is the metal plate on your printer?

    Frederick

    the metal plate/sheet itself I think is about 1mm thick but between it and the bed there's the magnetic/adhesive layer wich is about 2mm thick, so in total about 3mm of thickness



  • @the_dragonlord said in About bed leveling & C:

    the metal plate/sheet itself I think is about 1mm thick but between it and the bed there's the magnetic/adhesive layer wich is about 2mm thick, so in total about 3mm of thickness

    Sorry I wasn't clear in what I asked.

    On my printer there is a metal plate 6mm thick.

    The heater is adhered to the bottom of that plate.

    The BuildTak piece with all the magnets is adhered to the top of that plate.

    Then the flexible BuildTax piece naturally sticks to the piece with the magnets.

    So do you have some sort of metal plate under the piece with the magnets?

    If so how thick is it?

    Thanks.

    Frederick



  • @fcwilt said in About bed leveling & C:

    @the_dragonlord said in About bed leveling & C:

    the metal plate/sheet itself I think is about 1mm thick but between it and the bed there's the magnetic/adhesive layer wich is about 2mm thick, so in total about 3mm of thickness

    Sorry I wasn't clear in what I asked.

    On my printer there is a metal plate 6mm thick.

    The heater is adhered to the bottom of that plate.

    The BuildTak piece with all the magnets is adhered to the top of that plate.

    Then the flexible BuildTax piece naturally sticks to the piece with the magnets.

    So do you have some sort of metal plate under the piece with the magnets?

    If so how thick is it?

    Thanks.

    Frederick

    uh yes, yes of course I have...it's an alluminum plate about 3mm tick I suppose...(I can't find my caliper at now so I can't be more precise)



  • @the_dragonlord said in About bed leveling & C:

    uh yes, yes of course I have...it's an alluminum plate about 3mm tick I suppose...(I can't find my caliper at now so I can't be more precise)

    If it is about 3mm that would explain why you need 6 adjustment screws rather than 3.

    All is now clear.

    Thanks very much.

    Frederick



  • @fcwilt said in About bed leveling & C:

    @the_dragonlord said in About bed leveling & C:

    uh yes, yes of course I have...it's an alluminum plate about 3mm tick I suppose...(I can't find my caliper at now so I can't be more precise)

    If it is about 3mm that would explain why you need 6 adjustment screws rather than 3.

    All is now clear.

    Thanks very much.

    Frederick

    you're welcome


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