Spiderweb when probing



  • Hello,

    How do you guys avoid making a bed full of dots and spider web when probing?
    No matter how much I retract before probing I end up with a mess when probing is done.

    /Niklas


  • administrators

    I probe at 190C and when the printer is loaded with PLA, I get the dots but not the threads. It looks to me that you are getting oozing, so probig at a lower temperature may help.

    I haven't experimented, but the following might work better:

    1. Heat the nozzle to a lower temperature, perhaps 170C
    2. Extrude a few mm of filament very slowly (because of the low temperature), then immediately retract several mm.
    3. Wipe the nozzle on a cleaning area before probing

    But this is only an idea, and it will probably need to be modified to work well.



  • I don't use any be compensation but do use the nozzle with a precision switch to probe the bed for homing. I find that 140 deg C with PLA is sufficiently hot to soften the plastic enough that I get accurate readings and good repeatability. Although it could be that on my set up it needs more force to trigger. Try it and see.



  • Ah of course. Lower temperature while probing.

    I wonder what s3d will do if I set a low temp in the starting script before the bedleveling routine.

    I’ll experiment a little and return. 🙂



  • @myschetzky:

    Ah of course. Lower temperature while probing.

    I wonder what s3d will do if I set a low temp in the starting script before the bedleveling routine.

    I’ll experiment a little and return. 🙂

    That's exactly how to do it, set a low temp, I use 150deg c, then set the real temp afterwards.

    [c]M140 S[bed0_temperature] ; set bed temp
    M190 S[bed0_temperature] ; wait for bed temp
    M104 S150 ; set extruder temp to 150C cold enough to avoid ooze but get some temp on it
    M109 S150 ; wait for extruder temp
    G29;
    G1 X5 Y20 F1500 ; avoid binder clips
    M104 S[extruder0_temperature] ; set extruder temp
    M109 S[extruder0_temperature] ; wait for extruder temp[/c]


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