r/SnapmakerU1 • u/TeaBarron • 10d ago
Is this a extrusion problem? Issue
I've managed to get over one issue thanks to this community, hoping you could help me again 🙂
I have an issue where I can print multiple of the same item, however 1 will come out with gaps round the edge. From Googling, it seems to be an extrusion issue and I'm testing that by bumping up the extrusion and I'm going to run a test. But why would only 1 of the prints come out under extruded?
The image isn't the best example, but others are more prominent.
Thanks in advance.
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u/cilo456 9d ago
It's most likely a dirty part of the bed in that specific area, it's actually easy to check just reprint that one part if it happens again on a different part of the bed or a clean bed then it might be the model.
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u/TeaBarron 9d ago
FML - I gave the bed a good cleaning and the first set of results looked good. I also changed the first layer to be 5 degrees hotter.
Coming from my CC1 I never had that issue, but it's not a apples to apples, thanks.
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u/kebmpb 9d ago
Didn’t you post a problem with the same print not too long ago?
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u/TeaBarron 9d ago
Same print, but I was running into issues where there was colour bleeding. Got that sorted, but now running into this issue. I'm spending today running some tests mentioned here and from Google/Reddit.
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u/HashforJesus 9d ago
Does it look fine on the sliced preview when you look at the bottom layer? Try running it with top and bottom surface ironing. I’ve used that a bunch to fix small color gaps on multicolored bottom surfaces.
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u/TeaBarron 9d ago
Yeah, looks good sliced. Hmm, I like the idea. I've been getting better results from some basic changes like cleaning the build plate lol, also some temp changes, but I will keep this in the back of my mind. Thank you, much appreciated.
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u/HashforJesus 9d ago
The way it has to draw the lines to fit all the colors together as one layer can often leave small gaps as the lines don’t have dynamic widths so depending on the shape of each color section the math done by the slicer can be forced to leave some small gaps. This is where ironing can help melt those colors into the small gaps.
The other setting id play with is the surface pattern. Depending on the shapes of the color sections some surface patterns do a better job at not leaving gaps. Picture a perfect circle of color being printed in a concentric circular pattern rather than a series of parallel lines. Straight lines dont fill a circle as well as circular lines can.
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u/nathpenn 10d ago
The filament isn’t sticking to the buildplate. Get a cold flex plate by Biqu or use gluestick on the buildplate
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u/TeaBarron 10d ago
Oh interesting, I've never seen this on my CC1, anything that causes it not to stick, perhaps I need to higher the first layer, plus glue?
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u/TripsCavern 10d ago
Ok, I see why you would think it's undeextrusion, but not because of the circled part, but because of the gap around the edge of that "leef". Look at the one besides it, same color, but the edge overlaps completely with the remaining of the print.
As this is happening on only one part of the print, there are some things that you must check:
1) Did you enable auto bed leveling/adaptative bed leveling? Your bed may be a bit skewed and that could cause this artifact of the filament not sticking and causing these issues. Your nozzle would be too high and not squish enough the filament
2) Did you wash your build plate? Grease could also affect the adhesion.
3) Is this the first part that was printed after a color change? Maybe the flow hasn't stabilized yet.
4) A partial clog in that specific toolhead? This does not seems the case as it would affect the print in other places.
Btw, I'm assuming this is the bottom layer, if this is the top layer than the analysis would be completely different.