Steps per unit: Z correct, X and Y off



  • Hi

    I have a delta I am about to take into operation. I have seen an odd behaviour. Distance travelled is correct in Z, but in X and Y seems to be off by a factor of about 1.5 to 1.6. Have I missed something in my config.g?


    ; Configuration file for Mini Kossel kit from Think3DPrint3D for testing Duet WiFi

    ; Communication and general
    M111 S0 ; Debug off
    M550 PK250000 ; Machine name and Netbios name (can be anything you like)
    M551 Preprap ; Machine password (used for FTP)
    ;*** If you have more than one Duet on your network, they must all have different MAC addresses, so change the last digits
    M540 P0xBE:0xEF:0xDE:0xAD:0xFE:0xED ; MAC Address
    ;*** Wifi Networking
    M552 S1 ; Enable WiFi

    M555 P2 ; Set output to look like Marlin
    M575 P1 B57600 S1 ; Comms parameters for PanelDue

    G21 ; Work in millimetres
    G90 ; Send absolute coordinates…
    M83 ; ...but relative extruder moves

    ; Axis and motor configuration
    M569 P0 S1 ; Drive 0 goes forwards
    M569 P1 S1 ; Drive 1 goes forwards
    M569 P2 S1 ; Drive 2 goes forwards
    M569 P3 S1 ; Drive 3 goes forwards
    M569 P4 S1 ; Drive 4 goes forwards
    M574 X2 Y2 Z2 S2 ; set endstop configuration (all endstops at high end, active high)
    ;*** The homed height is deliberately set too high in the following - you will adjust it during calibration
    M665 R206.6538 L288.32 B110 H494.9 ; set delta radius, diagonal rod length, printable radius and homed height
    M666 X0 Y0 Z0 ; put your endstop adjustments here, or let auto calibration find them
    M350 X128 Y128 Z128 E16:16 I1 ; Set 128x microstepping with interpolation
    M92 X800 Y800 Z800 ; Set axis steps/mm
    M906 X800 Y800 Z800 E500:500 I30 ; Set motor currents (mA) and increase idle current to 60%
    M201 X1000 Y1000 Z1000 E1000 ; Accelerations (mm/s^2)
    M203 X20000 Y20000 Z20000 E3600 ; Maximum speeds (mm/min)
    M566 X800 Y800 Z800 E1200 ; Maximum instant speed changes mm/minute

    ; Thermistors
    M305 P0 T100000 B3950 R4700 H30 L0 ; Put your own H and/or L values here to set the bed thermistor ADC correction
    M305 P1 X200 ; Put your own H and/or L values here to set the first nozzle thermistor ADC correction
    M305 P2 X201 ; Put your own H and/or L values here to set the second nozzle thermistor ADC correction
    M570 S180 ; Hot end may be a little slow to heat up so allow it 180 seconds

    ; Fans
    M106 P1 H-1 ; disable thermostatic mode for fan 1

    ; Tool definitions
    M563 P0 D0 H1 ; Define tool 0
    G10 P0 S0 R0 X-9 Y3 ; Set tool 0 operating and standby temperatures
    ;*** If you have a single-nozzle build, comment the next 2 lines
    M563 P1 D1 H2 ; Define tool 1
    G10 P1 S0 R0 X9 Y3 ; Set tool 1 operating and standby temperatures
    M92 E1168.48:1168.48 ; Set extruder steps per mm

    ; Z probe and compensation definition
    ;*** If you have a switch instead of an IR probe, change P1 to P4 in the following M558 command
    M558 P1 X0 Y0 Z0 ; Z probe is an IR probe and is not used for homing any axes
    G31 X9 Y38 Z1.123 P500 ; Set the zprobe height and threshold (put your own values here)

    ;*** If you are using axis compensation, put the figures in the following command
    M556 S78 X0 Y0 Z0 ; Axis compensation here

    M208 S1 Z-0.2 ; set minimum Z
    ;
    T0 ; select first hot end




  • What is the setup? 1.8 degree steppers? Belt type? Teeth on pulley?



  • Yes, 1.8 deg steppers, GT2 belt, 10-tooth-pulleys


  • administrators

    In this command:

    M665 R206.6538 L288.32 B110 H494.9 ; set delta radius, diagonal rod length, printable radius and homed height

    check that the L parameter is correct. It should be the length of a diagonal rod measured between the bearing centres. When you are sure it is correct, perform 6-factor auto calibration. If you make a large change to the L parameter, temporarily increase the M558 H parameter to a larger value before performing auto calibration, e.g. 20.



  • M92 X800 Y800 Z800 ; Set axis steps/mm

    Seems really high. Shouldn't it be more like 160 for your setup?

    http://www.prusaprinters.org/calculator/



  • Thanks for your inputs. I was way off on delta radius, all is working now. The M92 is correct with 128 microstepping, btw.


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