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  1. #1

    BLTouch and extruder temp

    So I have my BLTouch 3.1 setup, works fine, running on my Ender3 pro using Cura slicer. If I run bed leveling from the menu, it works fine. My issue is running it from start Gcode in Cura. The extruder and bed heat up before the bed leveling, and everytime the extruder is on, I get an extruder alarm. I think the board can't handle trying to maintain extruder temp while talking to the BLtouch(if I manually increase the temp with the knob while the probe is touching, i the knob doesnt change the temp for a second).

    My problem is that I cannot see any custom start Gcode for heating the bed and extruder. The only Gcode I have involves the BLTouch commands, homing, and extruder reset. The heating procedure appears to automatically begin before any start Gcode commands. Is there a setting in Cura somewhere I am not seeing? I'm using Ultimaker Cura v4.6.1 with an skr mini e3 v1.2 on the newest Marlin(2.0.x or whatever). There is a separate Start Gcode tab for the printer and extruder, but the extruder is blank.

  2. #2
    Hi,
    Don't know if this will help you or not, but here are my settings from the start gcode in Cura (4.6.1).

    M117 Heating Bed.
    M140 S{material_bed_temperature_layer_0} ; Set Heat Bed temperature
    M190 S{material_bed_temperature_layer_0} ; Wait for Heat Bed temperature
    M117 Pre-heat extruder to 160.
    M104 S160; start warming extruder to 160
    G28 ; Home all axis.
    M117 Auto bed-leveling.
    G29 ; Auto bed-level (BL-Touch)
    G1 X0 ; Move to side of bed.
    G92 E0 ; Reset Extruder
    M117 Heat extruder up to full temp.
    M104 S{material_print_temperature_layer_0} ; Set Extruder temperature
    M109 S{material_print_temperature_layer_0} ; Wait for Extruder temperature
    G1 Z1.0 F3000 ; move z up little to prevent scratching of surface
    G1 X0.1 Y20 Z0.3 F5000.0 ; move to start-line position
    M117 Purge the extruder.
    G1 X0.3 Y200.0 Z0.3 F1500.0 E15 ; draw 1st line
    G1 X0.6 Y200.0 Z0.3 F5000.0 ; move to side a little
    G1 X0.6 Y20 Z0.3 F1500.0 E30 ; draw 2nd line
    G92 E0 ; reset extruder
    G1 Z1.0 F3000 ; move z up little to prevent scratching of surface
    M117 Printing model.

    Hope it helps,

    Andy

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