Z and E Calibration Conundrum
-
@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.
-
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.
-
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?
-
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
-
@Veti I will give the weight a try tomorrow too!
-
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.
-
@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.
-
@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).
