Interesting differences in print quality

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CloneProblem02 CloneProblem01

These two extruder bodies were printed in clone mode. The white one shows serious stribes that resemble Z wobble, but the blue one doesn’t. Since only X movement was different between the two it is either that, which i don’t believe due to the error existing on all sides, or it derives from the difference in the material. Interestingly the original setting was for the white material. If anything the blue one should show small signs of underextrusion since the filament diameter for that was smaller than for the white.

 

Edit:

This is the difference in stepping distance when doing 0.1mm steps. This is not simple z wobble but something different again since it occurs along the z axis, not perpendicular to it.

This is the difference in stepping distance when doing 0.1mm steps. This is not simple z wobble but something different again since it occurs along the z axis, not perpendicular to it.

Interestingly the problem is uneven movement along z, not perpendicular to it.

3 Comments

  1. bmarl

    2016-02-20 at 17:23

    It seems to be related to the threaded rod regardles sof my efforts to reduce z-Wobble. The pattern is exactly the M8 threading of the rods. It beeing less on one side hints towards the left rod beeing the problem. It seems i messed up when reassembling the machine the last time.

    • I use 5m for the main reason that they are to week to cause z wobble (with 12mm smooth rods). When the treaded rod wobble it fights the frame and smooth rods. That’s why you want a “week” treaded rod.

      • bmarl

        2016-02-20 at 18:06

        With M5 i would have had to support the thread in three places instead of two, so it does not bend under the load from the belt.
        To fight Z Wobble from the beginning i put the Z nut on an extension that has a slight flex in X/Y but not Z.

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