Ender 3 Pro BL Touch Trigger Height
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Maybe take a look here. Get the bed as level as possible first. Then run the mesh.
Also, redo your Z probe trigger height measurement. If the probe body is 8mm above the nozzle the trigger height should be around 2mm, not around 0mm.
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@Phaedrux Seems ok but i don't think its 8mm between the bltouch/nozzle and the bed.
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After the bed is leveled well, follow these steps.
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@Phaedrux said in Ender 3 Pro BL Touch Trigger Height:
I've already done it but then when i home z it is way upper than the picture. The best way to describe it it would be imagine the same picture but with the bltouch deployed so the nozzle would be even far from the bed.
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@jcv1977 said in Ender 3 Pro BL Touch Trigger Height:
G1 X50 Y20 F6000 ; go to first probe point G30 ; home Z by probing the bed
In your homez and homeall you're using the corner of the bed to probe. Change that to place the probe at the center of the bed.
Also use that position to measure your trigger height.
If there is tilt in the bed when you do this the the trigger height won't be right either, so make sure the bed is leveled. The guide linked shows it being done with both the hotend and bed at temp to allow for thermal changes. Also make sure that the mesh isn't loaded when doing the leveling.
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I 've had it with this, it keeps happening the same all over again. I guess there is something wrong with the bltouch. I have done a manual level of the freaking bed that i thing it would be perfect. Then i follow the guide again and the result is that the homing of the z axis is in the middle of the bed but the damn nozzle is really way too up to even try an auto level .
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Are we sure your z axis steps per mm is correct? Does moving 10mm in Z actually move 10mm?
Video of the process so we can maybe see something we're missing? Sometimes it's the little things that get overlooked, or a misunderstanding that becomes easy to clear up when we can see what's happening.
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@Phaedrux I 've been asking the same question for a couple of days now, today i will get a caliper and i will be able to measure it correctly.
Sometimes it's the little things that get overlookedAmen to that!!!!
I'll make a video of it.
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Well trying again to set the bltouch right. I did some modification to the bed, i 've replaced the springs for m3 spacers so the bed is really steady also there where a severe difference between the spacers been used in the bed gantry i don't know how did that machine pass the "quality test" but now the bed has little margin of error
BUT yep there is always that frightening word, the freaking compensation is not working when i run the bed compensation i get this on some mesh parts:
1/31/2021, 10:11:05 AM Warning: Skipping grid point (47.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (67.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (87.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (107.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (127.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (147.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (167.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (187.0, 220.0) because Z probe cannot reach it 70 points probed, min error -0.034, max error 0.477, mean 0.251, deviation 0.152 Height map saved to file 0:/sys/heightmap.csv 1/31/2021, 10:11:04 AM Warning: Skipping grid point (47.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (67.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (87.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (107.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (127.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (147.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (167.0, 220.0) because Z probe cannot reach it Warning: Skipping grid point (187.0, 220.0) because Z probe cannot reach it 70 points probed, min error -0.034, max error 0.477, mean 0.251, deviation 0.152 Height map saved to file 0:/sys/heightmap.csv 1/31/2021, 10:10:45 AM Warning: Skipping grid point (187.0, 180.0) because Z probe cannot reach it Warning: Skipping grid point (187.0, 200.0) because Z probe cannot reach it 1/31/2021, 10:10:05 AM Warning: Skipping grid point (187.0, 140.0) because Z probe cannot reach it Warning: Skipping grid point (187.0, 160.0) because Z probe cannot reach it 1/31/2021, 10:09:26 AM Warning: Skipping grid point (187.0, 100.0) because Z probe cannot reach it Warning: Skipping grid point (187.0, 120.0) because Z probe cannot reach itThe thing is that all of that coordinates can indeed be reached by the prove i've seen all the measurement itself and i can tell you that non of that coordinates are unreachable. So there might be something else wrong.
this is my actual G31 part:
G31 P500 X-46 Y6 Z3.34 ; set Z probe trigger value, offset and trigger heightIf a run a test print the print is ok but i don't want to try a really big print if i am not sure that the bltouch is working the way it should.
Any ideas?
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when defining the grid you have to take the offset of the probe into consideration.
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@Veti But when i defined the grid i used the probe as point of reference thats why in reality all that coordinates are indeed reachable.
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post the output of
M208
and
G31 -
M208
1/31/2021, 11:22:02 AM M208 Axis limits X0.0:230.0, Y0.0:210.0, Z0.0:200.0G31
1/31/2021, 11:23:07 AM G31 Z probe 0: current reading 0, threshold 500, trigger height 3.340, offsets X-46.0 Y6.0 -
Post your config.g please.
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Config.g
; Configuration file for Duet WiFi (firmware version 3) ; executed by the firmware on start-up ; ; generated by RepRapFirmware Configuration Tool v3.2.1 on Tue Jan 12 2021 22:19:26 GMT-0500 (EST) ; General preferences G90 ; send absolute coordinates... M83 ; ...but relative extruder moves M550 P"Ender 3 Pro" ; set printer name ; Network M552 S1 ; enable network M586 P0 S1 ; enable HTTP M586 P1 S0 ; disable FTP M586 P2 S1 ; disable Telnet ; Drives M569 P0 S0 ; physical drive 0 goes backwards M569 P1 S0 ; physical drive 1 goes backwards 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 without interpolation ;M350 E16 I1 ; configure microstepping with interpolation M92 X80.00 Y80.00 Z397.44 E449.62 ; set steps per mm M566 X900.00 Y900.00 Z24.00 E180.00 ; set maximum instantaneous speed changes (mm/min) M203 X7000.00 Y7000.00 Z5000.00 E500.00 ; set maximum speeds (mm/min) M201 X500.00 Y500.00 Z150.00 E350.00 ; set accelerations (mm/s^2) M906 X900 Y900 Z900 E900 I60 ; set motor currents (mA) and motor idle factor in per cent M84 S40 ; Set idle timeout ; Axis Limits M208 X0 Y0 Z0 S1 ; set axis minima M208 X230 Y210 Z200 S0 ; set axis maxima ; Endstops M574 X1 S1 P"xstop" ; configure active-high endstop for low end on X via pin xstop M574 Y1 S1 P"ystop" ; configure active-high endstop for low end on Y via pin ystop M950 H3 C"nil" ; Disable heaters h3-h7 to free up pins M574 Z1 S2 ; configure Z-probe endstop for low end on Z ; Z-Probe M950 S0 C"exp.heater3"; create servo pin 0 for BLTouch M558 P9 C"^zprobe.in" H6 F200 T2000 ; set Z probe type to bltouch and the dive height + speeds M280 P0 S10 ; send control signal to BLTouch through servo/gpio 0 ;Bed Height adjustments G31 P500 X-46 Y6 Z3.34 ; set Z probe trigger value, offset and trigger height M557 X47:205 Y20:230 S20 ; define mesh grid ;M557 X47:205 Y20:230 S32 ; define mesh grid ; Heaters M308 S0 P"bedtemp" Y"thermistor" T98801 B4185 ; 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 ;M307 H0 B0 S1.00 ; disable bang-bang mode for the bed heater and set PWM limit M307 H0 R0.304 C437.7 D7.20 S1.00 V24.0 M140 H0 ; map heated bed to heater 0 M143 H0 S80 ; set temperature limit for heater 0 to 80C M308 S1 P"e0temp" Y"thermistor" T98801 B4185 ; 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 ;M307 H1 B0 S1.00 ; disable bang-bang mode for heater and set PWM limit ;M307 H1 R2.305 C156.6 D6.40 S1.00 V24.0 M307 H1 R2.303 C154.7 D6.52 S1.00 V24.0 M143 H1 S250 ; set temperature limit for heater 1 to 250C ; Fans M950 F0 C"fan0" Q500 ; create fan 0 on pin fan0 and set its frequency M106 P0 S0 H T45 ; set fan 0 value. Thermostatic control is turned on 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 S"Hotend" 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 T0 ; select first tool G28 ;M558 P9 H5 F100 T2000 ;M558 P9 C"^zprobe.in" H5 F100 T2000 ; BLTouch connected to Z probe IN pin ;M950 S0 C"exp.heater3" ; create servo/gpio 0 on heater 3 pin on expansion connector ... ;G31 X-46 Y6 Z3.02 ;M501 -
@jcv1977 said in Ender 3 Pro BL Touch Trigger Height:
Axis limits X0.0:230.0, Y0.0:210.0, Z0.0:200.0
this does not match your config.
check all your files maybe you are overwriting it somewhere
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Your Z probe is in front of the nozzle by 6mm, so it's unable to reach the Y position you've set in M557.
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@Phaedrux no, it's behind the nozzle, maybe i wrongly put positive 6 when it is negative? That's why i am sure that every single coordinate can be reach i've saw myself the whole measurement and the probe can reach all of them fine.
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Ah yes, sorry. Y6 would be behind the nozzle.
Veti pointed out the real issue.
M208 X230 Y210 Z200 S0
M557 X47:205 Y20:230 S20
Your M557 is asking it to go to 230 but your axis maximum is only 210. The error messages say it's skipped 220.
