Tevo LM recent conversion and z step issues

[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.

HTH

Doug

[the_gibson]

@dougal1957 said in Tevo LM recent conversion and z step issues:

G30 P3 X0 Y-140 H0 Z-99999

Testing now!

[the_gibson]

@the_gibson

How about that...

G32
Calibrated 6 factors using 13 points, deviation before 1.177 after 0.026

[Dougal1957]

@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)

[the_gibson]

@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]

@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]

@the_gibson It is better, but definitely still dragging the print. first layer goes down great.

[T3P3Tony]

@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"

[the_gibson]

@t3p3tony like the Z steps aren't moving appropriately. As soon as the second layer starts, you can hear the hotend dragging across the print, eventually either breaking the extruded material free of the bed, or creating a very deformed print. This still feels like either an extrusion issue, or a z steps being off issue.

but first problem is definitely fixed.

[Dougal1957]

@the_gibson said in Tevo LM recent conversion and z step issues:

@t3p3tony like the Z steps aren't moving appropriately. As soon as the second layer starts, you can hear the hotend dragging across the print, eventually either breaking the extruded material free of the bed, or creating a very deformed print. This still feels like either an extrusion issue, or a z steps being off issue.

but first problem is definitely fixed.

What size pulleys do you have 16 or 20 tooth or some other size?

[the_gibson]

@dougal1957 Stock 20 tooth pulleys.

[Dougal1957]

@the_gibson said in Tevo LM recent conversion and z step issues:

@dougal1957 Stock 20 tooth pulleys.

Have you double checked them as your symptoms suggest that yours are slightly different to that.

[the_gibson]

@dougal1957 I have not. Assumed they were what was listed on the printer specs. You think they are 16's?

[Dougal1957]

@the_gibson said in Tevo LM recent conversion and z step issues:

@dougal1957 I have not. Assumed they were what was listed on the printer specs. You think they are 16's?

that is what I would think maybe what you could do is mark one tooth with a sharp and then count them.

[crpalmer]

@the_gibson I think that your steps/mm are right for x/y/z. If they were wrong you'd get a calibrated height that was well off of 530 because the calibration also calibrates how high it can go. Also, mine was running back in its stock days with the same value.

Is your first layer actually a little too close? You could print a cube and see if you have "elephant foot" at the bottom indicating it is too close.

If not, are you extruder steps/mm correct and have you calibrated the flow rate? Dragging could also be over extrusion.

[the_gibson]

@dougal1957 Definitely 20's.

[the_gibson]

@crpalmer I am leaning toward overextrusion now as well.

[the_gibson]

@crpalmer I have reduce the extruder steps all the way down to 160... still happening...

Starting to rule out overextrusion.

adding current 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"HOWEE"                                      ; set printer name
M555 P2
M665 R157 L397.107 B175 H525                        ; 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 X32 Y32 Z32 E32 I1                            ; configure microstepping with interpolation
M92 X160 Y160 Z160 E810							; set steps per mm
M566 X1500.00 Y1500.00 Z1500.00 E1500.00           ; set maximum instantaneous speed changes (mm/min)
M203 X39960 Y39960 Z39960 E3000.00        ; set maximum speeds (mm/min)
M201 X1000.00 Y1000.00 Z1000.00 E1500.00           ; set accelerations (mm/s^2)
M906 X1100 Y1100 Z1100 E880 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 Z4.4                                 ; 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
 

[crpalmer]

@the_gibson Your original config of the steps:

M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z80.00 E403.00 ; set steps per mm'

is probably better than what you have now. I think interpolation only works at 16 steps/mm which was a mistake in my old config.

Did you ever print a small cube to see what it looked like?

[the_gibson]

@crpalmer said in Tevo LM recent conversion and z step issues:

M350 X16 Y16 Z16 E16 I1 ; configure microstepping with interpolation
M92 X80.00 Y80.00 Z80.00 E403.00 ; set steps per mm'

Adjusted back to these settings.

printing one now... this is going to be funny.