First layer after remachining delta parts



  • So, my first layer looked alllllllmost exactly like this before i reworked my entire delta 3d printer to try and get rid of the effector tilt.

    I squared up by bed to my towers as best i could, one of them is slightly off but i got it closer. I think the bed isn't flat or is warped or something.

    I remachined the carriage tops that the magballs attach to and machined a fixture to align the balls to within +-.002” of eachother.
    I machined new magball effector attachments as well and machined a fixture to align them to the same position and tollerance.
    I made a fixture to ensure all pieces are flat to eachother as well.

    I machined 3 “C” channels that i clamp to the effector to measure tilt and parallelism to the bed.
    It’s dead nuts perfect in 4 out of 6 positions (near tower, away from tower x3) and the 2 positions are near the tower where the bed seems to have issues.

    Made fixtures for new magball rods for the same tolerance and for repeatability.

    Got a bullseye bubble level and found the effector is dead nuts, pretty much no tilt.

    Ran a mesh bed level and what used to be +-1-2mm out is now .02mm out max. Mostly in the known problem area.

    Good.

    Then i run a first layer test and i get inconsistent extrusion, its decent in some areas and underextruded in others. Also, my solid infill and shells are not connected and i cant seem to change a setting that will change this.

    Any help would be appreciated to help me dial this in. 83CE7908-EA3F-4CBB-9309-C58050F52F37.jpeg



  • hey,



  • I’m not quite sure on the z=0 datum so probably no on that.

    I did load the heightmap and i did PID calibrate the nozzle heater.

    What’s the procedure for z=0 datum g30?



  • So I performed G92 Z=0 and loaded the mesh bed map.

    Now every time I need to change baby stepping up by .6-.8mm or the nozzle touches...
    I'm really perplexed on how to calibrate this.
    If I increase the H variable in M665 by .6 the nozzle starts way too high....


  • Moderator



  • I can't get this delta printer to operate even halfway correctly and I've already spent 3x the pricetag. I've run G32, G29, G29 S-1. Manually compensated Z probe trigger heights at all probe points.

    I've taken the arms off and remeasured and aligned all the magballs. Every dimension is within .002" to eachother.

    I really don't understand what's going on and how precise this needs to be to get a halfway decent print. Every time I change something, the first layer test is bad in a different way.



  • @Phaedrux and yes, I've read and followed both of those pages word for word over 5 times now.



  • 24809150-BEBB-4D70-870D-47CA708A4C2E.jpeg


  • Moderator

    Share all your config files and slicer start gcode?
    Firmware version? what duet board?



  • @gperman
    Do you have a predator by any chance?



  • Hi,

    I worked and worked on my 3 delta's trying to get really good results.

    Then I got an FolgerTech FT-5.

    That worked so well with so little effort I scrapped the delta's for parts.

    Frederick



  • @jay_s_uk yes I do.



  • @Phaedrux homedelta.g heightmap.csv config.g config-override.g bed.g

    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Sun Apr 05 2020 18:40:43 GMT-0400 (Eastern Daylight Time)
    
    ; General preferences
    G90                                                ; send absolute coordinates...
    M83                                                ; ...but relative extruder moves
    M550 P"Anycubic Predator"                          ; set printer name
    M665 R211.7 L440 B185 H433.0                      ; Set delta radius, diagonal rod length, printable radius and homed height
    M666 X0 Y0 Z0                                      ; put your endstop adjustments here, or let auto calibration find them
    
    ; Network
    M552 S1                                            ; enable network
    M586 P0 S1                                         ; enable HTTP
    M586 P1 S0                                         ; disable FTP
    M586 P2 S0                                         ; disable Telnet
    ; Drives
    M569 P0 S1                                         ; physical drive 0 goes forwards
    M569 P1 S1                                         ; physical drive 1 goes forwards
    M569 P2 S1                                         ; physical drive 2 goes forwards
    M569 P3 S1                                         ; physical drive 3 goes forwards
    M584 X0 Y1 Z2 E3                                   ; set drive mapping
    M350 X16 Y16 Z16 E16 I1                            ; configure microstepping with interpolation
    M92 X80.00 Y80.00 Z80.00 E406.90                   ; set steps per mm
    M566 X1200.00 Y1200.00 Z1200.00 E1200.00           ; set maximum instantaneous speed changes (mm/min)
    M203 X18000.00 Y18000.00 Z18000.00 E1200.00        ; set maximum speeds (mm/min)
    M201 X1000.00 Y1000.00 Z1000.00 E1000.00           ; set accelerations (mm/s^2)
    M906 X1000 Y1000 Z1000 E800 I30                    ; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                            ; Set idle timeout
    
    ; Axis Limits
    M208 Z0 S1                                         ; set minimum Z
    
    ; Endstops
    M574 X2 S1 P"xstop"                                ; configure active-high endstop for high end on X via pin xstop
    M574 Y2 S1 P"ystop"                                ; configure active-high endstop for high end on Y via pin ystop
    M574 Z2 S1 P"zstop"                                ; configure active-high endstop for high end on Z via pin zstop
    
    ; Z-Probe
    M558 P5 C"zprobe.in" H2 F100 T15000                 ; set Z probe type to switch and the dive height + speeds
    G31 P1000 X0 Y0 Z16.819                            ; set Z probe trigger value, offset and trigger height
    M557 R170 S17                                      ; define mesh grid
    
    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B4138     ; configure sensor 0 as thermistor on pin bedtemp
    M950 H0 C"bedheat" T0                              ; create bed heater output on bedheat and map it to sensor 0
    M143 H0 S120                                       ; set temperature limit for heater 0 to 120C
    M307 H0 B0 S1.00                                   ; disable bang-bang mode for the bed heater and set PWM limit
    M140 H0                                            ; map heated bed to heater 0
    M308 S1 P"e0temp" Y"thermistor" T100000 B3950      ; configure sensor 1 as thermistor on pin e0temp
    M950 H1 C"e0heat" T1                               ; create nozzle heater output on e0heat and map it to sensor 1
    M143 H1 S280                                       ; set temperature limit for heater 1 to 280C
    M307 H1 B0 S1.00                                   ; disable bang-bang mode for heater  and set PWM limit
    
    ; Fans
    M950 F0 C"fan0" Q500                               ; create fan 0 on pin fan0 and set its frequency
    M106 P0 S0 H-1                                     ; set fan 0 value. Thermostatic control is turned off
    M950 F1 C"fan1" Q500                               ; create fan 1 on pin fan1 and set its frequency
    M106 P1 S1 H1 T45                                  ; set fan 1 value. Thermostatic control is turned on
    
    ; Tools
    M563 P0 D0 H1 F0                                   ; define tool 0
    G10 P0 X0 Y0 Z0                                    ; set tool 0 axis offsets
    G10 P0 R0 S0                                       ; set initial tool 0 active and standby temperatures to 0C
    
    ; Custom settings are not defined
    
    ; Miscellaneous
    M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; set voltage thresholds and actions to run on power loss
    M501						   ; Allows stored parameters to be read
    
    

    PrusaSlicer start G-code:

    G28 ; home all axes
    G1 Z5 F5000 ; lift nozzle
    
    

    Screen Shot 2020-05-29 at 9.31.52 AM.png



  • @gperman

    Take G28 out of your start Gcode
    Are you calibrating before every print attempt them loading your print file?


  • Moderator

    When you send G28 to home it's calling homedelta which is moving all the carriages to the endstops. This is clearing your calibration.

    When are you running G32 to call your bed.g file?

    https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer#Section_Auto_calibrating_before_each_print



  • This post is deleted!


  • @Phaedrux

    So I was getting a lot of assistance today from Jay_s_uk which helped a little. He gave me his bed calibration file to try and I updated the firmware to the 3.1.1 zip whole package.
    None of it really helped my issues really but it was good info.

    Much thanks to him and everyone helping me out with this.

    So, What I do is run Autocalibration G32 3 times than upload the results using M500. Then I run Mesh bed leveling G29 once and upload it G29 S1. Then I home the machine by hitting home all and then start the G-Code.

    You're saying every time the machine is homed it clears the calibration? I didn't know this. Why does it clear the calibration? I suppose I will have to stop homing the machine before prints.
    Should I just include the Bed.g code+M500 in my slicer code upon startup so It runs a calibration before every print?

    Should I mesh bed level every print or just G32?

    What do ya'll use for bed calibration?

    I have a smart effector en route but it will take a while to get that up and running.

    Also, here is the quality prints i've been dealing with:
    unnamed.jpg unnamed (2).jpg unnamed (1).jpg

    First layer is too close to the bed inconstantly and has gaps between shell and infill. Dimensional stability is AWFUL. Circles are not circles, straight lines wander around. Top layer is EXTREMELY underextruded.

    I PID calibrated the nozzle 5 times and bed the same. Changed hot end to Mosquito, no change. Changed heater cartridge to mosquito, no change. Changed thermister to filamentone high temp cartridge. Received calibration data from them for the cartridge, no change. New fans, no change. Capricorn bowden, no change. Bondtech extruder assembly, changed steps to match, no change.

    I changed extrusion multiplier up, down and all around, no change.



  • @gperman

    Hi gperman,

    Can you delete the config_override raise the Rin your config to R231.750 then restart the board to make sure it takes effect
    Then run G28, then heat the bed to 60c and hot end to 130c run G32 M665 M500 and check the Radius R of the new config_override see if it has changes please.



  • @Carlo

    Sorry run the G32 let it finish calibration then M665 from the console then M500 from the console then check the file.


  • Moderator

    @gperman said in First layer after remachining delta parts:

    Then I home the machine by hitting home all and then start the G-Code.

    When you do that you're resetting the position of where the firmware thinks the bed based on the location of the endstops which are never 100% accurate. You need to establish where the bed is with G30 before starting the print and before doing the mesh.



  • @Carlo said in First layer after remachining delta parts:

    M6

    Ok. I will try this tomorrow



  • @gperman

    Make sure you take G29 S1 out of your bed file and anywhere else you may have put it and delete your heightmap.cv file you will need to remake a new one when you get your probing sorted but that is probably hindering you at the moment so best get rid and remove all your start gcode from your slicer for now as its wrong we can sort that once your probing is accurate.
    Also are you sure your rod length is exactly 440. not 440.### something ?



  • Performed G32 -> M665 -> M500 three times. no homing. Which resulted in this:
    Calibrated 9 factors using 16 points, (mean, deviation) before (-0.001, 0.016) after (-0.000, 0.013)
    Auto calibration successful, deviation 0.013mm

    M665:
    Diagonals 440.847:440.847:440.847, delta radius 212.607, homed height 432.734, bed radius 185.0, X 0.632°, Y -0.509°, Z 0.000°

    All at 130 deg nozzle and 60 deg bed.

    No signs of G29 in any file. Deleted my heightmap.

    Compensation in use: none

    unnamed.jpg unnamed (1).jpg

    Still issues with dimensional stability and inconsistent nozzle height.



  • @gperman

    Thats good..now copy the height and the radius to your config one at a time click save then when asked if you want to
    restart click No
    We haven't done a height map yet which we are getting to..



  • @Carlo
    yeah but better !


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