Getting a strange issue on this part. Sliced with cura and printed on an Orion delta. Extrusion multiplier/flow is set to 100% with print speed of 40mm/sec. This is PLA from ultimachine printing at 220c. 0.2 layer height with 1mm shell. The retraction distance is 6mm at 110mm/sec speeds. Filament diameter measures at 1.8mm but printing 1.75mm. Orion has a stock nozzle 0.5mm. What could be causing Under extrusion in that specific area? Any help, suggestions, ideas greatly appreciated!
Too much retraction, not enough time for the nozzle to reprime.
(Been there, done that, didn’t really solve it.)
did it solve it?
Agree, not enough time to recover from a 6mm retraction, could try and lower retraction and add extra filament on the restart.
Agree,i think for some simple design no need choose retraction .because it is very easy to make nozzle jamed
@Mike_Miller @Anton_G @Wayne_Friedt Thanks, I tried several print tests now with retraction at 5 and 4mm. The section did have more extrusion but still not completely filled. I just tried with retraction completely off and got similar issue with very slight improvement. I’m going to try cranking up the flow to 150% and dropping the filament diameter to 1.5
Is it possible the Bowden is binding at that point in the bed
Not sure why it would since the layers below that section are extruding just fine. I’ve tried slicing with simplify3D and the issue persists.
I’ve seen that before. I have a hard time describing it. The wall is too thin for the nozzle and slicing strategy. One hack is to tell the slicer you have a smaller nozzle than you really do. If that doesn’t work, you might try a different slicer, really get a nozzle small enough or adjust the model.
If you haven’t tried Slic3r, then try that. Cura and Simplify3D slice in a certain way that it must lay complete loops, so if a part is narrower than two nozzle diameters, you are in for some trouble.
It looks very much like it’s not recovering from the retraction quick enough. One thing that I found fixed this sort of thing with my cartesian machine was firmware retraction, where it recovers a lot slower, giving the filament more time to become molten and preventing any under-extrusion from mild jamming.
I know this is way late, but try random and not aligned seam. That way the start and stop point and in a different spot. I believe it’s your mesh in drawing with the width not being able to lay a second wall or something. If was using Slic3r, change to random start stop and not seam, in advance settings set width to auto, check box to generate extra perimeters, set nozzle size, layer. I still think the model is to narrow for size of nozzle. K, that’s my two cents.