On 12/31/2021 at 1:32 PM, maggiolo72 said:The last pictures are from the top surface skin layer. My U20 have no Marlin firmware, think reprap, but I can do some live tuning. If I remember correctly speed -temperature -flow -fan speed....
Yeah - those are pretty badly underextruded. I mean I've seen much worse but that's about 20% underextruded. You are going to have things like outer walls not connected to the rest of the part.
@GregValiant posted a nice picture (many posts back) where he zoomed into another of your photos and showed those gaps using red and yellow lines (he probably used mspaint?). You may need reading glasses to see up close but your top layers are nicely showing underextrusion. If you cut the speed in half and increas the flow to 105% that should fix it. Never go over 110% flow (assuming your extruder is calibrated properly where 100mm of extruding moves the filament 100mm when hot end is removed). If you are at 110% flow you are near the point of complete grinding/failure. 105% is safe enough but indicates something is wrong but at least you can probably get good prints.
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maggiolo72 6
OMG thank you so much. lifesaver.... I will print and let you know.
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