You’re looking for something with a periodic oscillation and the extruder’s the most likely culprit. You can do a visual inspection by releasing the guidler and removing the filament so you can view the hobbed bolt/gear. Set the temp of the hot end and get the extruder to extrude 100mm (without filament). Watch the gearing for wobble and watch the hobbed bolt/gear for any unusual movement. The chances are you’re getting movement somewhere that isn’t rotational.
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1 month later
What kind of Mount do you have your extruder could be causing the hot end to wiggle in the Mount Or a loose bearing or rod but something that moves in a very repeatable fashion I would guess a off center gear or pulley
10 months later
have you found a resolution to this problem?
having a similar problem
It is the errors in rounding of the steps in your x y steppers. My mendel does the same when setting steps x=166. Setting to 160 does fix it but my print is not to scale. I can use cura to scale up the model to make up for that.
no that is never the case. my mendelmax has 55 steps per mm and still works perfectly
I took a look at the forum post, from the pictures you seem to be having a different issue than I was having. In my case, I believe my calibration print was printing too slow (like 10mm/sec). whenever i did a regular print and printed between 30-60mm/sec the ripples were not very visible.
In your case, it looks like it is a combination of printing too fast for your particular printer and z-screw wobble.
You might want to print out some z-screw stabilizers and slow down your prints and do a quick test after you have made those modifications.
Good Luck…
1 month later
Found a year old post with a similar problem of mine! did you discover anything? I’m having this issue and I found out a way to make the problem more evident: vary the extrusion multiplier by small amounts. This should give you different inclinations of the effect, from diagonal to vertical and horizontal. I initially thought I was seeing z banding, then I changed the extrusion multiplier and siddenly I got slightly inclined banding! Clearly, the extruder is oscillating proportionally to extrusion rate, creating the pattern.