SOLVED new to RRF - Slow print speeds after conversion from RAMPS



  • Hi All,

    Ran a RAMPS w/ marlin for the longest time, just recently made the switch to a Duet 2 wifi 1.04. Flashed to Firmware 3.1.1. Cartesian printer, formerly Anet A8 but at this point only the stepper motors are original.

    Got everything wired up and BL Touch calibrated. Started with a simple 20mm cube with Z scaled to 10mm, no infill, 2 walls. Just wanted to verify good adhesion and the thing would actually print.

    Printed fine in the sense it turned out ok, but the wall print speed was painfully slow. Using Cura 4.8, i did change the firmware version to reprap in the printer settings and made sure my start GCODE was all good. Cura is set for 60mm/s print speed, inner walls at 30mm/s. I didn't change a single setting compared to when i was running the ramps so not sure what's going on.

    Before the print actually starts there's a G1 F9000 (Max speed is set to 6000 in config.g). I can see before each layer there's G1 commands to lower the feedrate to 3600 then 1800 right after. I don't know why this is happening since that's 60mm/s and 30mm/s respectively which should be correct.

    Hoping that someone can shed some light on what's happening here. On the first print i accidentally left top and bottom layers and once it got to the top layers it started printing at normal speeds, but i overwrote that gcode file and don't have it anymore.

    Config.g

    ; Configuration file for Duet WiFi (firmware version 3)
    ; executed by the firmware on start-up
    ;
    ; generated by RepRapFirmware Configuration Tool v3.1.10 on Fri Dec 04 2020 11:06:48 GMT-0500 (Eastern Standard Time)
    
    ; General preferences
    G90                                                     ; send absolute coordinates...
    M83                                                     ; ...but relative extruder moves
    M550 P"Anet A8"                                         ; set printer name
    
    ; Network
    M552 S1                                                 ; enable network
    M586 P0 S1                                              ; enable HTTP
    M586 P1 S0                                              ; disable FTP
    M586 P2 S1                                              ; Enable Telnet
    
    ; Drives
    M569 P0 S1                                              ; physical drive 0 goes forwards
    M569 P1 S1                                              ; physical drive 1 goes forwards
    M569 P2 S0                                              ; physical drive 2 goes backwards
    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 X100.00 Y100.00 Z400.00 E100.00                     ; set steps per mm
    M566 X600.00 Y600.00 Z18.00 E300.00                     ; set maximum instantaneous speed changes (mm/min)
    M203 X6000.00 Y6000.00 Z180.00 E6000.00                 ; set maximum speeds (mm/min)
    M201 X2000.00 Y2000.00 Z100.00 E10000.00                ; set accelerations (mm/s^2)
    M906 X500 Y500 Z500 E800 I30                            ; set motor currents (mA) and motor idle factor in per cent
    M84 S30                                                 ; Set idle timeout
    
    ; Axis Limits
    M208 X-18 Y0 Z0 S1                                      ; set axis minima
    M208 X220 Y220 Z240 S0                                  ; set axis maxima
    
    ; Endstops
    M574 X1 S1 P"!xstop"                                     ; configure active-low endstop for low end on X via pin xstop
    M574 Y1 S1 P"!ystop"                                     ; configure active-low endstop for low end on Y via pin ystop
    M574 Z1 S2                                              ; configure Z-probe endstop for low end on Z
    
    ; Z-Probe
    M950 S0 C"exp.heater3"                                  ; create servo pin 0 for BLTouch
    M558 P9 C"^zprobe.in" H5 F120 T6000                     ; set Z probe type to bltouch and the dive height + speeds
    G31 P500 X40 Y10 Z0.675                                 ; set Z probe trigger value, offset and trigger height
    M557 X20:200 Y20:200 S40                                ; define mesh grid
    
    ; Heaters
    M308 S0 P"bedtemp" Y"thermistor" T100000 B4725 C7.06e-8 ; configure sensor 0 as thermistor on pin bedtemp
    M950 H0 C"bedheat" T0                                   ; create bed heater output on bedheat and map it to sensor 0
    M307 H0 A120.2 C570.1 D1.7 V12.1 B0 S1                  ; disable bang-bang mode for the bed heater and set PWM limit
    M140 H0                                                 ; map heated bed to heater 0
    M143 H0 S130                                            ; set temperature limit for heater 0 to 130C
    M308 S1 P"e0temp" Y"thermistor" T100000 B4725 C7.06e-8  ; configure sensor 1 as thermistor on pin e0temp
    M950 H1 C"e0heat" T1                                    ; create nozzle heater output on e0heat and map it to sensor 1
    M307 H1 A713.8 C241.3 D4.5 V12.2 B0 S1                  ; disable bang-bang mode for heater  and set PWM limit
    M143 H1 S275                                            ; set temperature limit for heater 1 to 275C
    
    ; Fans
    M950 F0 C"fan0" Q500                                    ; create fan 0 on pin fan0 and set its frequency
    M106 P0 S0 H-1                                          ; set fan 0 value. Thermostatic control is turned off
    M950 F1 C"fan1" Q500                                    ; create fan 1 on pin fan1 and set its frequency
    M106 P1 S1 H1 T45                                       ; set fan 1 value. 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
    T0                                                      ; select first tool
    
    
    

    Sorry but for some reason it won't let me upload the GCODE file, maybe because this is my first post?


  • Moderator

    Your cura start gcode likely has some marlin commands to set low speeds which is overriding your config.g



  • Wow, quick response, thank you.

    This is the start G Code

    G21 ;metric values
    G90 ;absolute positioning
    M82 ;set extruder to absolute mode
    M106 P0 S0 ;start with the fan off
    G28 X0 Y0 ;move X/Y to min endstops
    G28 Z0 ;move Z to min endstops
    M140 S{material_bed_temperature} ;Start heating bed
    M190 S{material_bed_temperature} ;Wait for bed to reach temp before proceeding
    G29 ;Level Bed
    M104 S{material_print_temperature} ;Start heating extruder
    M109 S{material_print_temperature} ;Wait for extruder to reach temp before proceeding
    G1 Z15.0 F9000 ;move the platform down 15mm
    G92 E0 ;zero the extruded length
    G1 F200 E1 ;extrude 1mm of feed stock
    G92 E0 ;zero the extruded length again
    G1 F9000
    M117 Printing...
    

  • Moderator

    @kmart said in new to RRF - Slow print speeds after conversion from RAMPS:

    a simple 20mm cube with Z scaled to 10mm, no infill, 2 walls.

    Try printing something bigger. Is it possible that the minimum layer time setting was reducing print speed on you?



  • oh crap.... I print in abs and do have a min layer time set. Will check that and come back.



  • That did it, embarassed i didn't see that but thank You!


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