Overhang corner quality issue | 3DMeltdown 3D Printing | Page 1

untold comet Feb 24, 2024, 6:10 PM

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I am having a little trouble playing with profiles to clean up an overhanging corner. Further up the print it seems to be okay but the lower corner is pretty janky. Both are 45 degrees exactly.

Quality is otherwise good.

This is polymaker petg, 0.2mm layer height, 0.4mm line width 240C, 80C bed, 240mms print speed, 1mm/s max square corner velocity, 3000 mm/s^2 acceleration, 2 walls with 30% cubic infill. Running on a modified ender 3 with Klipper. Sliced in cura 5.6.

I am not super sure what to dial in to get that to clean up

untold comet Feb 24, 2024, 6:31 PM

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I have 12 more of these to print so I don't want to just tank the speed, I don't see why I would be crap this low but better higher up.

Maybe something to do with part cooling?

night fulcrum Feb 24, 2024, 6:42 PM

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Yeah possibly part cooling

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Also are you printing in an enclosure?

untold comet Feb 24, 2024, 6:51 PM

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Yes

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Starts at 18 in the enclosure, hits apparently 39 at the end of the print

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This would be in the first bits of the print

night fulcrum Feb 24, 2024, 7:06 PM

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You should probably get it warm first and then start the print

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Maybe keep the bed temp up for 10 or so minutes before you print just for that enclosure to warm up

untold comet Feb 24, 2024, 7:18 PM

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Possibly, I would bet it isn't cooling fast enough with the heat from the bed, I need to design a test part for this.

granite harbor Feb 24, 2024, 7:49 PM

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Did you check the code preview? I might be imaging but it looks too me like the inner wall pokes through

untold comet Feb 24, 2024, 8:41 PM

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I have had this issue on another print, similar overhanging corner structure but I had chalked it up to the cheap pla.

Never figured that out, I just printed painfully slowly

untold comet Feb 26, 2024, 1:37 PM

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Made a quick test part

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50% part cooling fan
100% part cooling fan (repaired my warped fan duct too)
100% fan and dropped acceleration to 1000mm/s^2
100% fan, 500 mm/s^2, changed PA to 0.05
100% fan, 500 mm/s^2, ran another PA calibration test and ran at 0.068.

Better but not perfect, Seems like PA tuning made the most difference here

untold comet Feb 28, 2024, 5:40 PM

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Update: Almost perfect, I think playing with the PA a little more will fix it fully.

Unfortunately it did add quite a lot of time to the print so maybe I should play with the g-code to swap back to normal settings higher up

granite harbor Feb 29, 2024, 9:10 AM

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untold comet Update: Almost perfect, I think playing with the PA a little more will fix it fu...

I wonder if you rotate it by 45 degree the issues goes away or moves to a different side

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I hope i can explain it well in englisch if the nozzle moves in a 90 degree angle the time /distance it spends is "greater" then if its a oriantation that requires movement in 2 axis at once

untold comet Feb 29, 2024, 1:11 PM

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granite harbor I hope i can explain it well in englisch if the nozzle moves in a 90 degree angl...

For sure, it is a good call to try

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I will give it a crack

granite harbor Mar 2, 2024, 3:20 PM

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Got results?

untold comet Mar 2, 2024, 7:28 PM

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Kind of, the spool actually broke apart on me, I think they didn't do a good enough job hot gluing it, so my print failed as the filiment got stuck