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    3 Z motor bedl leveling debug

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    • alexusundefined
      alexus @jay_s_uk
      last edited by

      @jay_s_uk
      took me a bit time as i though my table is bent,,, finally setup confirgs with offsets for lead screws outside and zproble compensated relative to nozzle BUT it did not work.... i almost went crazy and then noticed when Z height is being probed and carridge moves say XY only my Z motros are moving... so i realized that while probing next to lead screws proghram was doing heatmap compensation and my reuslts been off all the time caz i mesured old twisted bed

      my guess Z aligment needs to be done with all heat map disabled and then heat map can be measured and loaded. so i deiifetly have error in configs.

      for now i just renamed heatmap file so it is not loeaded but im getting missing file errors...

      whats the proper way to load motor z motors leveling and then load (or not load) build plate heatmaps?

      here are my configs

      Partial config.g

      ;Lead Screw Locations (Alexus, 3Z Motor Setup)
      M671 X600:600:-85 Y345:68:209 S7 ; position of leadscrew/bed pivot point at 5,6,7 Motors (in that oreder), Includes adlustments as screws are outside the bed. S- how much adjusmpents permited mechanically
      
      ; Z-Probe
      ;Alexus BL Touch Declarations
      M558 P9 C"^zprobe.in" H5 F100 T2000			; Type 9 BL Touc, w/ pull up, H5 is dive heght 5mm
      M950 S0 C"duex.pwm1"						; Duex5 PWM port  - pin 8 yellow wire for servo deploy PWM
      G31 X28.78 Y0 Z3.02 P25						; Probe Offest 
      ; END declarations
      
      M557 X50:500 Y0:500 S75	               	; define mesh grid
      

      homez.g

      G91              ; relative positioning
      G1 H2 Z2 F6000   ; lift Z relative to current position
      G90              ; absolute positioning
      G1 X250 Y250 F6000 ; go to first probe point
      G30              ; home Z by probing the bed
      
      G29 S1			;alexus load heught map
      

      homeall.g

      G91                     ; relative positioning
      G1 H2 Z2 F6000          ; lift Z relative to current position
      G1 H1 X-505 Y-505 F5000 ; move quickly to X and Y axis endstops and stop there (first pass)
      G1 H2 X5 Y5 F6000       ; go back a few mm
      G1 H1 X-505 Y-505 F360  ; move slowly to X and Y axis endstops once more (second pass)
      G90                     ; absolute positioning
      G1 X250 Y250 F6000        ; go to first bed probe point and home Z
      G30                     ; home Z by probing the bed
      
      G29 S1			;alexus load heught map
      

      bed.g

      M561 ; clear any bed transform
      ;G29  ; probe the bed and enable compensation -- bed heatmap?? quoted out for 4Z testing 10.12.23
      
      G28 ; home
      
      
      G30 P2 X540 Y345 Z-99999 ;  	D5 probe near a leadscrew 
      G30 P1 X540 Y68 Z-99999 ; 		D6 probe near a leadscrew
      G30 P0 X25 Y209 Z-99999 S3 ; 	D7 probe near a leadscrew - and calibrate 3 motors  //Note X should be 0, but at X0, carridge colides with  gantry edge so i set dfference between probe and extruder
      
      

      my motor/leadscrew layout looks like this
      9a2b8f1f-4f6f-4cd1-898e-7cf376e15345-image.png

      any comments? 🙂

      moth4017undefined 1 Reply Last reply Reply Quote 0
      • moth4017undefined
        moth4017 @alexus
        last edited by

        @alexus is your bed in your printer like this?
        f21aa4a6-bb3d-4d87-9d01-259251ae8253-image.png

        <

        alexusundefined 1 Reply Last reply Reply Quote 0
        • alexusundefined
          alexus @moth4017
          last edited by

          @moth4017
          bed on illustration with original orientation is how printer looks when i'm standing in front of it. section where cartridge is depicted is origin X,Y = 0,0. So when i stand in front of printer 0,0 is rear right

          moth4017undefined fcwiltundefined 2 Replies Last reply Reply Quote 0
          • moth4017undefined
            moth4017 @alexus
            last edited by

            @alexus any reason why you didn't stick to a conventional x0 y0 at front left?

            <

            alexusundefined 1 Reply Last reply Reply Quote 0
            • fcwiltundefined
              fcwilt @alexus
              last edited by

              @alexus

              When doing bed leveling

              • cancel any baby-stepping with M290 R0 S0
              • cancel mesh compensation with G29 S2
              • move the probe to the center of the bed using a G90 G1 command
              • set the Z=0 Datum with a G30 command
              • use the G32 command to do bed leveling
              • once the bed is level do a G30 command again

              You can use the "meta" features to do bed leveling in a loop and have it stop when a specified degree of levelness is obtained.

              This is from my bed.g file so the numbers won't apply to you. Notice the M671. Some folks put that in config.g. I put everything related to bed leveling in bed.g

              M671 X-180:0:180 Y-65:130:-65 S3 ; positions of ball studs
              
              ; --- level bed ---
              
              while true
                ; run leveling pass
              
                ; determine where to probe
              
                ; --- probe near ball studs ---
              
                G30 P0 X-145 Y-65 Z-99999    ; probe near ball stud #1
                G30 P1 X0    Y100 Z-99999    ; probe near ball stud #2
                G30 P2 X145  Y-65 Z-99999 S3 ; probe near ball stud #3
              
                ; check results - exit loop if results are good
              
                if move.calibration.initial.deviation < 0.02
                  break
              
                ; check pass limit - exit loop if pass limit reached
              
                if iterations = 5
                  break
              

              Also remember that you need to set the Z=0 Datum at bed center:

              • when creating the height map
              • when loading the height map

              Frederick

              Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

              1 Reply Last reply Reply Quote 0
              • alexusundefined
                alexus @moth4017
                last edited by

                @moth4017
                original design was 4Z axis but i went back to backup setup

                @fcwilt
                tnx for description and loop script
                "Also remember that you need to set the Z=0 Datum at bed center:"

                • i assume this refferes to general Z0 setup or actual position to start measuring bed shold be 0?
                fcwiltundefined 1 Reply Last reply Reply Quote 0
                • fcwiltundefined
                  fcwilt @alexus
                  last edited by fcwilt

                  @alexus

                  While some folks like to have X=0 Y=0 at the corner of their bed I much prefer it to be the center of the bed.

                  To do this you set your X and Y min/max settings to be +/- half of the total range of each axis.

                  So for a X axis with 300mm of range of movement and a Y axis of 200mm range the M208 would be:

                  M208 X-150:150 Y-100:100
                  

                  Now this is just my preference but it is based on lots of experience with 8 different printers - some of which I designed and constructed myself - and all of them have been modified to suit me.

                  So with X=0 Y=0 at the center of the bed that is where I set the Z=0 Datum by moving the probe to the center and doing the G30.

                  Some folks like to set the Z=0 Datum using one of the points of the grid they use to create their height map. However I have different heightmaps for different situations and the only thing they have in common is that the center of the bed never changes and is always the center of the height map grid even if it doesn't coincide with a point on the grid.

                  Frederick

                  Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

                  alexusundefined 1 Reply Last reply Reply Quote 0
                  • alexusundefined
                    alexus @fcwilt
                    last edited by

                    @fcwilt
                    if bed center 0,0 i asusme slicer software needs to know about it?
                    i run laser cutting machine so flat XY (also do custom buldids) for my brain easier to visualize one corner as absolute zero. though center of bed kinda make sense as id imagine it wold be best tuned point

                    droftartsundefined 1 Reply Last reply Reply Quote 0
                    • droftartsundefined
                      droftarts administrators @alexus
                      last edited by droftarts

                      @alexus said in 3 Z motor bedl leveling debug:

                      if bed center 0,0 i asusme slicer software needs to know about it?

                      Yes, there's usually a printer configuration page for that.
                      In Cura it's in Settings > Printer > Manage Printers > [select printer] > Machine Settings > Printer > Origin at center
                      In PrusaSlicer it's in Printer Settings > Bed shape, then set the bed width and the origin on the bed:
                      77c521d2-d783-49b8-8f61-2f5f0e71dbc6-image.png

                      There's also a page in the Duet wiki about setting the bed origin in the middle: https://docs.duet3d.com/User_manual/Tuning/Bed_origin

                      Ian

                      Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                      fcwiltundefined 1 Reply Last reply Reply Quote 1
                      • fcwiltundefined
                        fcwilt @droftarts
                        last edited by

                        @droftarts said in 3 Z motor bedl leveling debug:

                        setting the bed origin in the middle

                        All the best folks put the origin there - it's a fung shui thing. 😀

                        Frederick

                        Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

                        alexusundefined 1 Reply Last reply Reply Quote 1
                        • alexusundefined
                          alexus @fcwilt
                          last edited by

                          @ droftarts
                          tnx i will take a look, i have cura 4.9 (as it seams last to work on Win7)

                          @fcwilt im not too superstitious 🙂 just yet maybe after few more failed 24h bulds 🙂

                          alexusundefined 1 Reply Last reply Reply Quote 1
                          • alexusundefined
                            alexus @alexus
                            last edited by alexus

                            is there way to automate G30 S-1 probe offset detection?
                            if i change nozzle or adjust screws seams to be too labor intense process to repeat all the time...
                            to make macro and run loop seams easy, but is there way to get a varianle with values and also how to write it back to config? is that possible? caz i thin just running macro makes more sense

                            droftartsundefined 1 Reply Last reply Reply Quote 0
                            • droftartsundefined
                              droftarts administrators @alexus
                              last edited by

                              @alexus said in 3 Z motor bedl leveling debug:

                              is there way to automate G30 S-1 probe offset detection?

                              A number of people have created Z probe offset macros. See https://forum.duet3d.com/search?term=macro+Z+offset&in=titles&matchWords=all

                              But it's going to depend on your printer and probe. If you don't have any way of measuring where the nozzle is (eg like @Exerqtor's macro), you're going to have to manually move the nozzle to the point where it touches the bed first, then you could run a macro that sets Z0, moves up then does G30 S-1, and then stores the probe offset.

                              Ian

                              Bed-slinger - Mini5+ WiFi/1LC | RRP Fisher v1 - D2 WiFi | Polargraph - D2 WiFi | TronXY X5S - 6HC/Roto | CNC router - 6HC | Tractus3D T1250 - D2 Eth

                              alexusundefined 1 Reply Last reply Reply Quote 0
                              • alexusundefined
                                alexus @droftarts
                                last edited by

                                @droftarts
                                https://forum.duet3d.com/topic/30411/thoughts-on-an-auto-z-offsett-macro?_=1700771813497

                                that one seams to have good starting point but yea looks like very script will be build specific
                                good thing im good with coding bad thing im rearly have enough time when no one disrupts me

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