topic_solved Tevo LM recent conversion and z step issues
All, thank you ahead of time for your help. I have recently converted my old TLM delta from a Smoothie to a Duet 2 Wi-fi... I think I've got everything dialed in and working except I am having an issue with the Zsteps not raising the head high enough, and dragging the nozzle, as well as eventually causing back pressure and clogging.
I have gone ahead and added a copy of my config.g
; Configuration file for Duet WiFi (firmware version 2.03) ; executed by the firmware on start-up ; ; generated by RepRapFirmware Configuration Tool v3.3.4 on Sun Oct 10 2021 10:43:02 GMT-0400 (Eastern Daylight Time) ; General preferences G90 ; send absolute coordinates... M83 ; ...but relative extruder moves M550 P"XXXXX" ; set printer name M665 R156.957 L397.19 B155 H521.850 ; Set delta radius, diagonal rod length, printable radius and homed height M666 X0.15 Y0.08 Z0.07 ; 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 E403.00 ; 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 X1200 Y1200 Z1200 E1200 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 M558 H30 ;*** Remove this line after delta calibration has been done and new delta parameters have been saved G31 P500 X0 Y20 Z4.5 ; set Z probe trigger value, offset and trigger height M557 R150 S45 ; define mesh grid ; Heaters M305 P0 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 0 M143 H0 S100 ; set temperature limit for heater 0 to 100C M305 P1 T100000 B4138 R4700 ; set thermistor + ADC parameters for heater 1 M143 H1 S280 ; set temperature limit for heater 1 to 280C ; Fans M106 P0 S0 I0 F500 H-1 ; set fan 0 value, PWM signal inversion and frequency. Thermostatic control is turned off M106 P1 S1 I0 F500 H1 T45 ; set fan 1 value, PWM signal inversion and frequency. 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
@the_gibson Have you run a G32 to do the delta calibration? If so, what does your bed.g look like and what's the result of running a G32? If not, you should do so and then post your bed.g and the output of the G32 command.
FWIW, I have a G32 in my start.gcode so that I ensure it's always calibrated. I'm pretty sure that you aren't doing that because you have:
M558 H30 ;*** Remove this line after delta calibration has been done and new delta parameters have been saved
still in your config.g which means it would be probing at 2mm/sec from 30mm up for each point and that would get boring to watch.
Zsteps not raising the head high enough, and dragging the nozzle, as well as eventually causing back pressure and clogging.
does the printer home successfully to the top? I assume the steps/mm of 80 for the axis are correct/the same as you had with your previous board?
The as already mentioned go through the delta calibration steps :
Once you have the machine successfully running a delta calibration routine, if there are still issues with Z height we can look at other potential causes.
@crpalmer New G32
here's the bed.g
;; bed.g ; called to perform automatic delta calibration via G32 ; ; generated by RepRapFirmware Configuration Tool v3.3.4 on Sun Oct 10 2021 10:43:02 GMT-0400 (Eastern Daylight Time) M561 ; clear any bed transform ; Probe the bed at 6 peripheral and 6 halfway points, and perform 6-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 X0 Y132.28 H0 Z-99999 G30 P1 X121 Y69.86 H0 Z-99999 G30 P2 X129.9 Y-75 H0 Z-99999 G30 P3 X0 Y-150 H0 Z-99999 G30 P4 X-129.9 Y-75 H0 Z-99999 G30 P5 X-121 Y69.86 H0 Z-99999 G30 P6 X0 Y59.15 H0 Z-99999 G30 P7 X56.09 Y32.38 H0 Z-99999 G30 P8 X64.95 Y-37.5 H0 Z-99999 G30 P9 X0 Y-75 H0 Z-99999 G30 P10 X-64.95 Y-37.5 H0 Z-99999 G30 P11 X-56.09 Y32.38 H0 Z-99999 G30 P12 X0 Y0 H0 Z-99999 S6 ; 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)
@the_gibson What does the console report when you run the calibration. It should tell you what kind of error it measured and how well it corrected it. Here's from my last print on my tlm:
Calibrated 6 factors using 13 points, (mean, deviation) before (0.031, 0.033) after (0.000, 0.032)
You want to have the last number (deviation after calibration) to ideally be less than 0.04 for good prints.
Are you really running the bed.g calibration when each probe point takes about 15 seconds to probe from 30mm up? That's what you config.g says.
@t3p3tony I have concerns about the steps/mm being off... these are the stock Nema17's from the TLM which are 1.8s.... wondering if I'm off there.
Calibrated 6 factors using 13 points, deviation before 4.965 after 0.453
I am, because when I remove that I get an error about the Z probe not triggering when it plainly does. willing to address that one AFTER I print the board mounts.
@crpalmer Conversely, do you have a known good config I could compare it to?
@the_gibson try that autocalibration a number of times to see what it converges to
@the_gibson That's never going to print well. The fact that the deviation is so high means that effectively the software is unable to compensate for whatever the hardware is doing. My TLM has many mods that make my current configuration useless to you. The last stock configuration I had was from 2018. You can look at it here in case it helps:
@the_gibson The steps/mm look right for stock. Can you post the output of
after you run G32 until it seems to converge (aka, the last deviation seems to stop getting smaller when you run the calibration)? I'm curious to see what corrections it ended up making.
@crpalmer You may be right, but it worked fine with this deviation (I am assuming since the geometry didn't change) on the old setup.
I'll tune it further.
@the_gibson I am however, pretty far from stock myself, just not on the motors. BMG, Mosquito, all the typical noise mods.
@crpalmer Latest returns:
M665 Diagonals 397.190:397.190:397.190, delta radius 159.764, homed height 528.280, bed radius 155.0, X 2.836°, Y 1.408°, Z 0.000°
M666 Endstop adjustments X-0.53 Y-0.74 Z1.27, tilt X0.00% Y0.00%
@the_gibson what deviation are you getting from G32 when it converges (i.e. running G32 repeatedly untill the is very little difference between runs)?
@t3p3tony High deviance no matter how many times I run it... I think I found why, and now I'm working on figuring it out. When the furthestmost forward Probe point is attempted, the sled for the X Axis is hitting the end of it's bottom travel, and bumping twice before it triggers the probe. That reading has to be throwing the whole thing off.
Going to work on adjusting the height of the bottom pulley, but is there a way to adjust the probing pattern? This is odd, because no mechanical changes were made, and the old smoothie board worked fine in this way.
but is there a way to adjust the probing pattern?
yes the probe points should be specified in your bed.g
G30 P0 X0 Y132.28 H0 Z-99999 G30 P1 X121 Y69.86 H0 Z-99999 G30 P2 X129.9 Y-75 H0 Z-99999 G30 P3 X0 Y-150 H0 Z-99999 G30 P4 X-129.9 Y-75 H0 Z-99999 G30 P5 X-121 Y69.86 H0 Z-99999 G30 P6 X0 Y59.15 H0 Z-99999 G30 P7 X56.09 Y32.38 H0 Z-99999 G30 P8 X64.95 Y-37.5 H0 Z-99999 G30 P9 X0 Y-75 H0 Z-99999 G30 P10 X-64.95 Y-37.5 H0 Z-99999 G30 P11 X-56.09 Y32.38 H0 Z-99999 G30 P12 X0 Y0 H0 Z-99999 S6
Dougal1957 last edited by Dougal1957
Try reducing the Y-150 on line 11 of your BED.G (line 4 in Tony's post) Post that will move the front probe point towards the centre try starting from -140.
ie make line 11 to be "G30 P3 X0 Y-140 H0 Z-99999" as you have it the front probe point is effectively 2.5 mm from the edge of your bed.
How about that...
Calibrated 6 factors using 13 points, deviation before 1.177 after 0.026
Dougal1957 last edited by
@the_gibson looking better has that solved the problem of the carriage fouling? also try running the G32 a few time see if it all settles in to lower figures (or the after deviation converges down so that each subsequent run doesn't get much different)
@dougal1957 Already all over that... and yes, carriage is good now.
I'll be posting back with results shortly.
definitely getting better.
G32 Calibrated 6 factors using 13 points, deviation before 0.085 after 0.031
@the_gibson ok, looking good now.
G32 Calibrated 6 factors using 13 points, deviation before 0.036 after 0.035
Going to try another print.
@the_gibson It is better, but definitely still dragging the print. first layer goes down great.
@the_gibson ok so delta calibration is looking good now, and you say the first layer is going down well, what do you mean by "but definitely still dragging the print"