I’ve started getting an issue where the part of the print AFTER an overhang will be blotchy or have large gaps in it and the rest of that side of the wall will have a bad finish. It’s not an issue with supports since its there whether the supports are there or not, rather I think it’s an issue with how overhang walls are printed slowly and then immediately after it tries to return to the normal wall print speed and that difference is both messing up the wall immediately after the overhang and also messing up the speed of that section of wall compared to the rest.
Are there any recommendations on how I should address this? Faster overhangs? Slower outer walls? Smoother acceleration? I’m on a 0.2 mm nozzle and generally using the .06 High Quality preset.
Sorry about that, here’s a picture. Also I was able to find that the issue resolves if I check “Don’t slow down for overhang” but I’m wondering if that’s the best solution or if anything can be done to fix the root issue.
I am having the same issue. Walls printed right after overhang walls have a bad quality, almost under extrusion kind problems. Did you find any other resolves than checking “don’t slow down for overhang”?
Nothing so far other than that setting.
Since it’s underextrusion based, it could be something to do with the extrusion gear. I’m going to see if servicing mine helps it at all.
I’m having a hard time understanding the problem. How should that part look? Is it an upside down stairstep?
The part should have smooth walls, but you can see that the area where the overhangs are, just above the support block, have veiny gaps on the side which looks like under extrusion. The shape is just an example of an overhang where the issue appears.
Well I’ve tried printing at a higher temperature, re-lubricated the z screws, cleaned the rods, and put in a new extruder gear, ran calibration again, but no luck. Still getting weird underextrusion wall gaps on layers with slow overhangs and the only thing that helps is turning off slow down for overhangs as I think it’s an issue where it’s not extruding fast enough from the slow overhang into normal print speed. Slower overall print speeds reduce the effect but don’t get rid of it completely.
Alright I found that Orca has a setting called Extrusion Rate Smoothing which does help with this issue. Basically it introduces a slower acceleration when there are sudden speed changes. Set it to a low enough value that you can see the acceleration change in the slider and it should work for this particular underextrusion:
