Uneven Fixed Delta Printer bed with Bltouch and 3D Touch
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I have a TEVO Little Monster Delta printer. I've been using it with a quick fix (raising the bed level on some sides). But, that kinda gets overwhelming after some time.
The problem is that the BLtouch (and I tried 3D Touch) doesn't make the fixed bed even, even with raised sides (raising the bed level basically). No matter what I do there is always a 0.4mm difference between Y-155 and Y155. Obviously, that means prints stick to the bed on Y155 side as expected while on Y-155 it prints to air. I tried to add more calibration points but that didn't fix the problem. still same.
; Configuration file for Duet WiFi (firmware version 1.21) ; executed by the firmware on start-up ; ; generated by RepRapFirmware Configuration Tool v2 on Tue Aug 27 2019 19:34:39 GMT+0300 (GMT+03:00) ; General preferences G90 ; Send absolute coordinates... M83 ; ...but relative extruder moves G53 M665 R155 L397.19 B155 H520 ; 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 M550 P"TEVO Little Monster" ; Set machine name 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 S0 ; physical drive 3 goes forwards M584 X0 Y1 Z2 E3 ; set drive mapping M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation M92 X160.00 Y160.00 Z160.00 E285.00 ; set steps per mm M566 X1200.00 Y1200.00 Z1200.00 E1200.00 ; set maximum instantaneous speed changes (mm/min) M203 X36000.00 Y36000.00 Z36000.00 E1200.00 ; set maximum speeds (mm/min) M201 X2000.00 Y2000.00 Z2000.00 E1000.00 ; set accelerations (mm/s^2) M906 X1300 Y1300 Z1300 E1300 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 Y2 Z2 S1 ; set active high endstops ; Z-Probe M307 H3 A-1 C-1 D-1 ; disable heater on PWM channel for BLTouch M558 P9 H5 F120 T6000 ; set Z probe type to bltouch and the dive height + speeds G31 P25 X20 Y0 Z0.11 ; set Z probe trigger value, offset and trigger height M557 R155 S8 ; define mesh grid ; Heaters M305 P0 T100000 B4138 R4700 ; Set thermistor + ADC parameters for heater 0 M143 H0 S120 ; Set temperature limit for heater 0 to 120C M305 P1 T100000 B4725 C7.060000e-8 ; set thermistor + ADC parameters for heater 1 M143 H1 S280 ; Set temperature limit for heater 1 to 280C M307 H1 A310.5 C199.7 D12.1 S1.00 V19.7 B0 ; Fans M106 P0 C"Right Fan" S1 I0 F500 H-1 ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off M106 P2 C"Left Fan" S1 I0 F500 H-1 ; set fan 2 value, PWM signal inversion and frequency. Thermostatic control is turned off ; Tools M563 P0 S"Extruder" D0 H1 F0:2 ; 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 ; Automatic power saving M911 S10 R11 P"M913 X0 Y0 G91 M83 G1 Z3 E-5 F1000" ; Set voltage thresholds and actions to run on power loss ; Custom settings are not configured ; Miscellaneous M500 M501 ; Load saved parameters from non-volatile memory; bed.g ; called to perform automatic delta calibration via G32 ; ; generated by RepRapFirmware Configuration Tool v3.1.4 on Thu Sep 03 2020 16:10:49 GMT+0300 (GMT+03:00) M561 ; clear any bed transform G28 ; home all towers ; Probe the bed at 12 peripheral and 6 halfway points, and perform 9-factor auto compensation ; Before running this, you should have set up your Z-probe trigger height to suit your build, in the G31 command in config.g. G30 P0 X20 Y0 H0 Z-99999 G30 P1 X0 Y132.28 H0 Z-99999 G30 P2 X67.08 Y116.18 H0 Z-99999 G30 P3 X121 Y69.86 H0 Z-99999 G30 P4 X148.59 Y0 H0 Z-99999 G30 P5 X129.9 Y-75 H0 Z-99999 G30 P6 X75 Y-129.9 H0 Z-99999 G30 P7 X0 Y-150 H0 Z-99999 G30 P8 X-75 Y-129.9 H0 Z-99999 G30 P9 X-129.9 Y-75 H0 Z-99999 G30 P10 X-148.59 Y0 H0 Z-99999 G30 P11 X-121 Y69.86 H0 Z-99999 G30 P12 X-67.08 Y116.18 H0 Z-99999 G30 P13 X0 Y59.15 H0 Z-99999 G30 P14 X56.09 Y32.38 H0 Z-99999 G30 P15 X64.95 Y-37.5 H0 Z-99999 G30 P16 X0 Y-75 H0 Z-99999 G30 P17 X-64.95 Y-37.5 H0 Z-99999 G30 P18 X-56.09 Y32.38 H0 Z-99999 G30 P19 X0 Y0 H0 Z-99999 S9 G30 P20 X20 Y0 H0 Z-99999 G30 P21 X40 Y0 H0 Z-99999 G30 P22 X154 Y12 H0 Z-99999 G30 P23 X136 Y72 H0 Z-99999 G30 P24 X112 Y-106 H0 Z-99999 G30 P25 X12 Y154 H0 Z-99999 G30 P26 X0 Y-155 H0 Z-99999 G30 P27 X20 Y0 H0 Z-99999 ; Use S-1 for measurements only, without calculations. Use S4 for endstop heights and Z-height only. Use S6 for full 6 factors ; If your Z probe has significantly different trigger heights depending on XY position, adjust the H parameters in the G30 commands accordingly. The value of each H parameter should be (trigger height at that XY position) - (trigger height at centre of bed) -
I suggest you take the M500 out your config.g, then re-run the full delta calibration sequence, followed by a single, manual M500.
https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer
The M500 creates or saves the config override file - but with it permanently in your config, that save happens before the M501 has chance to load the saved adjustment settings!
I believe that will result in no adjustments or delta compensation at all, as it is.
Robert J.
Printers: Overlord pro, Kossel XL+ with Duet 6HC and "Frankentron", TronXY X5SA Pro converted to E3D toolchange with Duet 6HC and 1LC toolboards.
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@rjenkinsgb Okay, I will try without M500. Removed it.
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@rjenkinsgb said in Uneven Fixed Delta Printer bed with Bltouch and 3D Touch:
I suggest you take the M500 out your config.g, then re-run the full delta calibration sequence, followed by a single, manual M500.
https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer
The M500 creates or saves the config override file - but with it permanently in your config, that save happens before the M501 has chance to load the saved adjustment settings!
I believe that will result in no adjustments or delta compensation at all, as it is.
Well, that didn't work. did the calibration and M500, still same.
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@sniper23 Sounds like you are suffering the dreaded Effector tilt so I would suggest you try to sort that before you go much further.
It's usually caused by the arms not being exactly the same length and or the spacing not being perfectly parallel
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@dougal1957 said in Uneven Fixed Delta Printer bed with Bltouch and 3D Touch:
@sniper23 Sounds like you are suffering the dreaded Effector tilt so I would suggest you try to sort that before you go much further.
It's usually caused by the arms not being exactly the same length and or the spacing not being perfectly parallel
As a patch until you can sort out the mechanical issue that is causing the effector tilt you can set the Z parameter for each G30 in your bed.g for each of the sample points. Make sure you move through the points in the same order as effector tilt is often dependant on the direction of motion.
You'll want to move to each point and do the measuring trigger height and checking repeatability from https://duet3d.dozuki.com/Wiki/Calibrating_a_delta_printer#Section_Setting_up_the_bed_g_file
But it is much better to find the source of tilt. Not that you can remove it all with a side mounted probe. But you can reduce it to less than 0.2mm and should be able to reach 0.1mm. That is why so many Delta users have moved to the Smart Effector and other nozzle probes. (FSRs under the bed also don't have this problem but have their own troublespots)
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@sniper23 said in Uneven Fixed Delta Printer bed with Bltouch and 3D Touch:
Well, that didn't work. did the calibration and M500, still same.
Did you leave the M501 in, to auto load the overrides?
Can you show what is in the config-override.g file?
