Thanks for the advice. I did try printing a version scaled x2 in the z-axis and the print came out perfect. I guess this means it is not a problem with the z-screw ?
Looking at the printing process closely, the deformity seen in the pictures at the base of the thinner cylinder seems to be caused by material already deposited sticking to the nozzle as it passes again. But in the scaled print there was no such effect...
Any ideas ?
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gr5 2,295
edit: in retrospect my answer below was not applicable - geert_2 answer is much better.
Try making the base twice as thick (try scaling it in cura 2X but in Z only - uncheck the lock). This will tell you if something is wrong with the hardware or the slicer.
I think something is wrong with your z screw in that it stops moving for several layers. It gets stuck. I think it's just a coincidence that it happens to happen at the top of the wider cylinder.
If I'm right then try cleaning the z screw. With power off push the bed way down. Clean the grease and dirt out of the z screw. Consider using WD-40 (for cleaning only! not for lubrant so remove it all after). And then lubricate with the tiniest amount of grease. In fact if you only clean a few inches of the z screw then you don't need to add any grease.
Edited by GuestLink to post
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