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Z axis freezes


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Posted (edited) · Z axis freezes

I use an anet A8 with the original firmware and CURA since version 3.5.

Since version 3.6 I have some problems:
On some parts the Z axis freezes.
For example my last print which is a total of 17mm high with supports, the printing starts and works very well up to 7.9mm then the Z axis remains locked at this value, but the printing of the layers does not stop. This damages the print head.

I tried to regenerate the gcode: idem
Other printing can be done without any problem

Of course I checked the functioning of the Z axis in manual mode and there is no problem.

Does anyone have any idea

Edited by VBill
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    Posted · Z axis freezes

    My Cura profile : https://drive.google.com/file/d/1y8SF37k-5CYBk128MLVfaw_8yi1os8UR/view?usp=sharing


    My gcode start :

    G21 ;valeurs métriques

    G90 ;positionnement absolu

    M82 ;mettre l'extrudeuse en mode absolu

    M107 ;commencez avec le ventilateur éteint

    G28 X0 Y0 ;déplacer X / Y à des butées min

    G28 Z0 ;déplacez Z en butées min

    G0 X0 Y15 F9000 ;Lit en avant

    G0 Z0.15 ;Déposer au lit

    G92 E0 ;zéro la longueur extrudée

    G1 X40 E10 F500 ;Extruder 10 mm de filament sur 4 cm

    G92 E0 ;zéro la longueur extrudée

    G1 E-1 F500 ;Rétracter un peu

    G1 X80 F4000 ;Essuye rapidement la ligne de filament

    G1 Z0.3 ;Levez et commencez à imprimer.

    G1 F9000 ;Message imprimer

    M117 Impression...


    End :

    M104 S0 ;chauffage de l'extrudeuse éteint

    M140 S0 ;chauffe-lit chauffant éteint

    G91 ;positionnement relatif

    G1 E-1 F300 ;rétracter un peu le filament avant de soulever la buse, pour libérer une partie de la pression

    G1 Z+0.5 E-5 X-20 Y-20 F9000 ;déplacez Z un peu et retirez le filament encore plus

    G28 X0 Y0 ;déplacez X / Y jusqu'à la butée min, de sorte que la tête soit à l'écart

    G90 ;positionnement absolu

    G1 Y190 F9000 ;le lit se déplace vers l'avant

    M84 ;steppers off

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    Posted · Z axis freezes

    Search your gcode file for the letter "Z".  It appears several times at the top of the file but then only once per layer.  Look at those values and see if something goes wrong at some point.


    I strongly suspect cura is fine and something is wrong with the Z axis.  Maybe the feedrate is too fast for your printer.  It will be the F number on the same line as the Z.  The F value is in mm/minute so it's 60 times larger than the speed in mm/sec.  Example:


    G0 Z12.1 F6000


    That would move to position nozzle 12.1mm above glass and at a speed of 100mm/sec (6000/60=100).




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    Posted · Z axis freezes

    I have performed several checks including the gcode (thanks gr5)
    I didn't find anything strange and the printing was blocked on the Z axis at the end of the support (6.9mm for my part)
    Finally I started again from the basic PLA Fine setting on CURA and is modified some parameters (temp, wall etc) and now everything works.

    This is all weird.

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