Z and E Calibration Conundrum
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@doublec4 said in Z and E Calibration Conundrum:
calibrated my x,y,z steps using a calipers
normally you do not do that.
since the components are known they are calculated. because backlash comes into play here they readings from calipers can be inaccurate.can you post your config
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Config below. The problem I have with my components is that I can't seem to find reliable info on them. The Dremel 3D20 (although it appears to be based off of flash forge / wanhao etc) might have some different parts? It had its own firmware and slicer and everything was on lock down out of the box. I guess I could count pulley teeth etc if that is what needs to be done.
; Configuration file for Duet WiFi (firmware version 2.03) ; executed by the firmware on start-up ; ; generated by RepRapFirmware Configuration Tool v3.1.4 on Sat Oct 17 2020 22:58:03 GMT-0400 (Eastern Daylight Time) ; General preferences G90 ; send absolute coordinates... M83 ; ...but relative extruder moves M550 P"Dremel" ; set printer name ; Network M551 P"" ; set password 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 X89 Y89 Z400 E150.00 ; set steps per mm M566 X900.00 Y900.00 Z12.00 E120.00 ; set maximum instantaneous speed changes (mm/min) M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min) M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2) M906 X800 Y800 Z800 E1000 I30 ; set motor currents (mA) and motor idle factor in per cent M84 S30 ; Set idle timeout ; Axis Limits M208 X0 Y0 Z0 S1 ; set axis minima M208 X290 Y155 Z125 S0 ; set axis maxima ; Endstops M574 X2 Y2 Z1 S0 ; set active low and disabled endstops ; Z-Probe M558 P0 H5 F175 T6000 ; disable Z probe but set dive height, probe speed and travel speed M557 X15:215 Y15:175 S20 ; define mesh grid ; Heaters M140 H-1 ; disable heated bed M305 P1 T100000 B4725 C7.060000e-8 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 M575 P1 S1 B57600 ; enable support for PanelDue M501 -
@doublec4 said in Z and E Calibration Conundrum:
M92 X89 Y89
those are rather unusual values.
lets calculate the values. measure the belt pitch with a ruler(spacing between the tooth)
take the length of lets say 10 tooth and divide the length by 10 (most belts used have a pitch of 2mm)then count the tooth on the pulley on the motor.
assuming a 2mm pitch belt, that would indicate a 18 tooth pulley.
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belt pitch is 2mm and number of teeth on pulleys appears to be 18. It's a little tough to count them as they are partially obstructed and the enclosure isn't all that large, but I am pretty confident that is the correct count.
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18 tooth pulley is unusual.
anyway put in the numbers
https://blog.prusaprinters.org/calculator_3416/
and you get
88.89 steps/mmare you sure that the thermistors is a semitec one?
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Changed to the following values based on 18T pulley and then calculated steps based on dimensions I've been getting from the calibration cube (0.7mm oversized in XY). See below config.
I also adjusted my Z steps and I noticed slight over extrusion/blobbing in the first several layers. I toyed with the extrusion % while the print was running in the DUET interface. Brought it down to 90% and the print was coming out pretty clean on subsequent layers. Cancelled that print, brought my E steps down to 140 as you can see below and I'm going to try another cube now...
; Configuration file for Duet WiFi (firmware version 2.03) ; executed by the firmware on start-up ; ; generated by RepRapFirmware Configuration Tool v3.1.4 on Sat Oct 17 2020 22:58:03 GMT-0400 (Eastern Daylight Time) ; General preferences G90 ; send absolute coordinates... M83 ; ...but relative extruder moves M550 P"Dremel" ; set printer name ; Network M551 P"" ; set password 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 X86 Y86 Z386.5 E140.00 ; set steps per mm M566 X900.00 Y900.00 Z12.00 E120.00 ; set maximum instantaneous speed changes (mm/min) M203 X6000.00 Y6000.00 Z180.00 E1200.00 ; set maximum speeds (mm/min) M201 X500.00 Y500.00 Z20.00 E250.00 ; set accelerations (mm/s^2) M906 X800 Y800 Z800 E1000 I30 ; set motor currents (mA) and motor idle factor in per cent M84 S30 ; Set idle timeout ; Axis Limits M208 X0 Y0 Z0 S1 ; set axis minima M208 X290 Y155 Z125 S0 ; set axis maxima ; Endstops M574 X2 Y2 Z1 S0 ; set active low and disabled endstops ; Z-Probe M558 P0 H5 F175 T6000 ; disable Z probe but set dive height, probe speed and travel speed M557 X15:215 Y15:175 S20 ; define mesh grid ; Heaters M140 H-1 ; disable heated bed M305 P1 T100000 B4725 C7.060000e-8 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 M575 P1 S1 B57600 ; enable support for PanelDue M501 -
@doublec4 said in Z and E Calibration Conundrum:
I've been getting from the calibration cube (0.7mm oversized in XY)
its more likely an issue with the extrusion rather than steps/mm.
i would keep the x y z values at the calculated ones for no.
the slicer will normally tell you how many grams the print is.
then measure the weight of the printed object and compare -
@Veti Also regarding the thermistor, it is an E3D cartridge style semitec 104GT
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@Veti I will give the weight a try tomorrow too!
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Cube just came off the printer and dimensionally it is great now. Within +/- 0.05mm in all dimensions.
Layers look clean, some minor ringing/ghosting on the letters but otherwise I'm satisfied for now. The edges of the cube could be a little crisper so I will look into pressure advance
I will print and weigh some models tomorrow. I'm happy with the result but I'm still a little baffled as to why I would have to reduce my E steps so much ... seems like a major disconnect between what the slicer thinks I need for mm vs what I actually need when printing.
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@doublec4 said in Z and E Calibration Conundrum:
I will print and weigh some models tomorrow. I'm happy with the result but I'm still a little baffled as to why I would have to reduce my E steps so much ... seems like a major disconnect between what the slicer thinks I need for mm vs what I actually need when printing.
i tend to reduce my e steps by 10% ob my printers, dont know why but it does produces better prints.
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@Veti said in Z and E Calibration Conundrum:
@doublec4 said in Z and E Calibration Conundrum:
I will print and weigh some models tomorrow. I'm happy with the result but I'm still a little baffled as to why I would have to reduce my E steps so much ... seems like a major disconnect between what the slicer thinks I need for mm vs what I actually need when printing.
i tend to reduce my e steps by 10% ob my printers, dont know why but it does produces better prints.
Similarly, I always use an extrusion multiplier of 95%. I'm not able to provide a link right now but somebody did a lot of work and came to the conclusion that printed parts can tolerate quite a high degree of under extrusion without any adverse consequences but are very intolerant of over extrusion. My own tests tend to agree (usual caveats about slicers, settings etc).
