Anybody can help with a config example ?

  • Good morning everyone.
    I have just finished my creature, a Cartesian with three 8 mm / 2 screws on X,Y,Z ( double Motor on Z), Nema 17, NC limit switches on both sides of each axis (later the lo one will be replaced by the BL touch probe).
    The extruder is a Flexion HT.
    The heated print bed is 310 x 310 mm and the stroke of the axes is much longer.
    So far, a lot of work but very pleasant for me, now a big wall in front of me: programming the Duet WIFI card.
    3D Sprinter.jpg

    I have already tried with the RepRap configurator but with no success, problems for homing, too slow speed in movement, overheating of motors and overrunning of endstops. It is a new world for me and I have to study.
    I wonder if anyone can help me with a Config file suitable for this type of machine ( three lead screw axes).
    It would be of great help as a basis to begin to understand and tidy up in the great confusion I have in my head
    Thanks to anyone who can help me.

  • Moderator

    If you post your current config.g and homing files we can try to work on that one. That may be easier since you'll already have put in many of your details into the configurator.

    You may also like this commissioning guide that goes over testing of the various functions.

    The only major things for the lead screw axes would be lower acceleration, jerk, and speed limits. And obviously getting the steps per mm correct.

    How do you know the motors are overheating? If you know the rated max current for the motors, you should choose a current setting of 60-85% of that max.

  • @Phaedrux
    Thank you so much for your kind help. I touched the motors after a second attempt to run a Home all axes and they were quite hot. But maybe was only impression I don't know.
    I'm living for work tomorrow morning, far from home (and my printer ) for about a week. As soon I'll be back home I'll send you my Config file as come out from rep rap configurato for custom cartesian. In the meantime I'll study about your advices.
    I'm so happy to know that somebody helping me.

  • That's quite a nice looking rig!

    You can relax this coming week, you found the right place.
    You'll get all the help you need here, there's a bunch of really knowledgeable helpful people here, many with homemade or highly modified rigs.

    PS Love the panic button!

  • Exactly, we WILL get you going.

  • Goodmorning everyone

    I'm still far away from the printer for work reason, but I have my laptop and I elaborated the configuration file, same as I did at home and loaded on the DWC , processed by the RepRap cartesian configuration tool. Compared to the default data available on configurator I have entered only the essential data omitting changes about the dynamics of the axes (also because I don't know exactly which data to put for lead screw axes ) to have a file that for the moment allows me to homing and make the machine move correctly.
    Instead of the Zprobe, I temporarily installed an NC limit switch which trigger at about 2 mm from the heated plate.
    I have available and connected to the Duet two limit switches for every axe ( I think i have to choose one as the option on configurator is"low or high end"..) and they are NC .
    Heated Bed is 310 x 310 , but the axes have a stroke of about : X 410, Y 410 and Z 290.
    Attached all the config files,
    Thank You.
    tpre0.g tpost0.g tfree0.g stop.g sleep.g resume.g pause.g homez.g homey.g homex.g homeall.g config.json config.g bed.g

    ; Configuration file for Duet WiFi (firmware version 2.03)
    ; executed by the firmware on start-up
    ; generated by RepRapFirmware Configuration Tool v2.1.8 on Tue May 05 2020 07:43:24 GMT+0200 (Central European Summer Time)

    ; General preferences
    G90 ; send absolute coordinates...
    M83 ; ...but relative extruder moves
    M550 P"My Printer" ; set printer name

    ; 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 Z4000.00 E420.00 ; 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 E800 I30 ; set motor currents (mA) and motor idle factor in per cent
    M84 S30 ; Set idle timeout

    ; Axis Limits
    M208 X-10 Y-10 Z0 S1 ; set axis minima
    M208 X320 Y320 Z280 S0 ; set axis maxima

    ; Endstops
    M574 X2 Y2 S1 ; set active high endstops
    M574 Z1 S2 ; set endstops controlled by probe

    ; Z-Probe
    M558 P5 H5 F120 T6000 ; set Z probe type to switch and the dive height + speeds
    G31 P500 X0 Y0 Z2.5 ; set Z probe trigger value, offset and trigger height
    M557 X5:215 Y5:195 S20 ; define mesh grid

    ; Heaters
    M140 H-1 ; disable heated bed
    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

  • @Sandro Welcome back!

    Just as a tip to make it easier for everyone to read your posts, when you copy in config.g or other files put 3 "backticks" (`) on a line above and below the block of text.

    It's on the same key as the tilde ~

    It inserts an scrollable window like this:

    This is the text
    This is more text

    Here's a quick reference for the ways to insert pictures and text, make bold, etc:

    Makes life lots easier for everyone. 🙂

    Just a couple quick things that caught my eye at first glance:

    Motor currents should run about 80% (roughly) of the steppers max current. The 800 you have (M906) looks about right so not sure why you'd be overheating.

    How did you figure your M92 steps per mm? Are your running both Z motors in parallel? The Z4000 seems a bit high, should it have been Z400??

    That's all that I saw, but I'm sure one of the more advanced people will jump in.

  • Moderator

    For a lead screw axis use this formula to determine the steps per mm

    steps_per_mm = (motor_steps_per_rev * driver_microstep) / screw_lead

    Ex: 800 = (400 * 16) / 8

  • @PuterPro

    thank you
    in fact I had many doubts about how to insert the Cofig file on the forum, now I know.
    in a week I will finally be home and I will put all your suggestions into practice hoping to be successful.

  • @Phaedrux
    Thanks for the formula, I had been looking for it for a long time ...

  • @PuterPro
    Yes I have two Z motors running in parallel connected to ZA and ZB slots on the DuetWIFI.
    I'll change settings as you suggest, changing the Z4000 to Z 400.

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