I tried now to use a 0.4 profile as base and changed the suggested parameters (line width, layer height) and saved it as custom profile. But when selecting the AA 0.8 print core and my created custom profile, the material is showing an orange background, alerting an issue.
Is this normal due the 0.4 profile I used as base for my 0.8 custom profile and can I print anyway or is there another problem I don't see.
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gr5 2,243
In the lower photo - those randomish layer lines are most likely caused by a dirty Z screw. Get a box of qtips and some wd-40 or oil and clean out the threads - it's a triple helix so make sure you get all 3 threads (or is it quad?).
The upper photo - that's strange looking. It could be partially caused by loose belts but loose belts are incredibly rare on UM2 and UM3 and S5. Pluck all 4 belts - both sides - while the print head is in a corner and make sure they are all roughly similar (roughly 60 to 200 Hz on a guitar tuner). No need to use the guitar tuner app - they should just be all similar - possibly one twice as loose. When belts are loose (or friction is very high - also put one drop of oil on each of the 6 rods in the gantry) you get walls sticking out a different distance depending if the head is traveling around the outside clockwise versus counter clockwise and so you get regions where the outer wall moves in or out.
More likely it's something in the model or cura. I'd look at that region carefully in Cura. There are lots of settings that might create this (and of course the model itself!):
optimize wall printing order
outer before inner (turning this on hides infill from showing through but makes overhangs worse)
infill overlap
combing
z seam
outer wall wipe distance
retract at layer change (turn that crap off)
Also you might want to slow all the printing speeds down to 30mm/sec and lower the nozzle temp by 10C just to see what happens. In general slower and cooler results in better quality.
I would concentrate on looking at the part in layer view first and if I couldn't figure it out I would toggle all the above settings and slow it down and change the temp to see if it got better and if so then reverse half the options at a time (binary search).
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gr5 2,243
I just realized this is an AA 0.8. Some of the profile settings are pretty bad in that profile. You might want to start with the AA 0.4 profile and change the line width to 0.8mm and layer height to 0.3mm. One in particular is the "retract at layer change". Make sure that is off - that alone could explain most of what you see here. I like to do 0.3mm layers and 35 mm/sec with my AA 0.8. The parts look quite good - the layer lines are not so bad and it prints 4X faster than my 0.4 nozzle prints.
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Smithy 1,146
Thank a lot for your help and very informative description of the problem!
The UM3 is quite new, 2 weeks old, but I checked the belts, all are in similar condition. I will also check and clean the Z screw, unlikely it is already dirty within this short time, but who knows.
How can I use a AA 0.4 profile with the AA 0.8 core? I assume to duplicate the AA 0.4 profile to have a custom one, modify your suggested parameters and then select this with the 0.8 print core, right? Because otherwise, the default profiles are unavailable if 0.8 print core is selected.
Beside the small cosmetic issues, printing with AA .08 makes really fun when not too much detail is required in the final object and it is a lot faster than with the AA 0.4.
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