Using mid-range friction vs light friction on the leveling card also makes a difference. The result was a first-layer print with no rippling.Ġ.05 mm difference between a thickness of 0.3 mm on the first layer and a leveling-card nozzle height of 0.25 mm makes a rippling difference. I kept the same "midrange" friction settings when leveling. To further explore the 0-90 degree suggestion provided by profesor79, I changed the slicer degree settings to 0-90 degrees and set the first layer thickness to 0.2 mm, which was equivalent to lowering the build plate knobs by 1/4 turn. Then, to be sure, I raised the plate by restoring the 1/4 turn on the knobs. You can see the smooth area where I manually lowered the build plate. Not knowing what else to do with the "too close" or "too far" or "unlevel" tips in the comments, I just manually lowered the build plate knobs 1/4 turn while the print was in progress. The bottom right of the image shows rippling. The following image illustrates the problem (and one of the solutions). The first layer thickness was set to 0.3 mm and the thickness of the leveling card was 0.25 mm. Problem cause: The midrange leveling height put the nozzle too close to the plate and caused rippling. The build plate was correctly leveled with "midrange" friction on the leveling card at the leveling points. I was running with a default 0.3 mm first layer (the tooltip setting says a slightly thicker layer helps with adhesion). The main problem is solved (first layer thickness vs leveled nozzle height). It's worth saying again that the piece feels pretty smooth on both the top and bottom sides, even though it looks awful. Looks almost like a weave pattern, since the squished parts alternate position on alternating lines. Almost like the extruder was oscillating vertically in the z-axis at that frequency, or perhaps the filament squishyness was oscillating at that frequency. A careful examination shows an oscillation in the squished filament segments on a filament thread. Here is a picture of the bottom of the piece. :-) Adhesion is fine on small prints in the middle of the plate. I don't want to believe that my build plate dips in the middle on my new machine, either. Corners don't usually show ripple effects. But the ripple shows up on both nozzles, always in the middle of the build plate, always in the middle of a big flat print. So, there is definitely drag on all three level points, about midrange between the lightest drag and the heaviest drag that makes me think I'm filing off part of the nozzle.ģ) I do have two nozzles, so I suppose the problem could show up on one but not the other if the nozzles were screwed into the block to give different heights. (Thank you to those who made comments!)ġ) I'm sure that the bed is as level as I can make it because I always go through the cycle twice).Ģ) Regarding clearance, if anything I worry that my clearance is too small since there is a fair amount of drag on my leveling card under the nozzle. UPDATE: I'm adding this info here to respond to several comments concerning bed leveling, etc. This machine has a direct drive with gears immediately above the nozzle.ĭoes anyone know why this rippling effect occurs, and what I might to do to correct it? Thanks I'm running a Qidi Xpro machine, Sunlu PLA+ (wonderful) filaments, bed 50 C, print temp 205-215, print speed 30-40 mm/s on the first layer, and first layer thickness 0.3 mm (normal layer thickness is 0.2 mm). That only happened once almost like junk was in the nozzle or the feed gears slipped or something). They feel fairly flat, only slightly rippled, even though they look terrible! (And I don't know what that weird row with blobs is in the top left of the picture. I am running a default first layer thickness of 0.3 mm because that is supposed to help adhesion (and adhesion is fine). I also tried adjusting the print temperature from 205-220 (the range on the box is 205-230). As far as I know, my heating plate is working fine, has no serious hot spots, and I'm using a high-quality PLA+ filament. I also wonder if one strip gets bent, then maybe the rest just follow the bends. When I tried adding fan 20% or 50%, nothing much changed (slight differences in the ripple pattern and area, but that pattern varies anyway). Normally, I use the default and print with no turbofan on the first layer. I'm just a newbie, so I was thinking they might have something to do with heat or contraction or something. The initial corner of a big flat print is fine, but then ripples begin to form as shown in the screenshot. I'm having issues with ripples on the first layer of big flat prints.
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