First turn on the hidden setting of support Z distance.
THE SOLUTION:
The minimum support Z gap is 1 time layer height if you don't want them totally fused together. What you can do is to change the support Z distance to 0.1 for 0.1mm layer height, 0.15 for 0.15 layer, etc. And also turn on the complete support interface. That's going to give you better bottom.
THE RANT:
The default should be 0.4 for 0.2 layer, and 0.2 for 0.1 layer, which I totally disagree.
The double layer height Z gap is guaranteed to produce horrible bottom like what you have. I don't know why Cura has default like these.
Imagine there is a 0.4mm gap, plus the 0.2 for the print layer itself, the nozzle would be 0.6mm away from the support surface, even larger than the 0.4mm nozzle diameter itself. How is that ever gonna work? Cura probably don't do over-extrusion to compensate for the gap either.
Same thing for the default gap for raft settings. 0.3 gap for 0.1mm layer. I honestly don't know how that could work.
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geert_2 558
I don't have an UM3, so this is only a guess: from the photo there appears to be a way too big gap between support structure and bottom of the model. So the first layers of the model do sag. Also it looks like the support structure is not dense enough: not enough contact points between support and model for good support. I can't comment on the cause: a problem in the design? Or a problem with underextrusion of the support material? Or wrong settings?
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payghamwa 0
Thanks for your comments. Unfortunately I have this issue with every part I print. Also put the settings into default but this didn't help. Support material comes from the same extruder like the actual part, so I don't think underextrusion is a problem :(
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