Bad solid layers. -- FIXED

Bambu Lab P1 Series Troubleshooting
1

I’ve included multiple pictures below. After owning my printer for about a month I have noticed a huge decrease in quality (not to mention an AMS issue, but I’ll save that for a different conversation).

What I’ve tried:
-Printing default .2 layer (3 top and 3 bottom layers), and many other default settings
-Changing to Gyriod infill and switching to 4 top layers - which helped, but that seems to be a bandaid fix vs root cause
-Replacing the hotend/nozzle
-Taking the extruder apart to check for loose filament
-Changing flow to .93 and .90
-Unhooked the AMS entirely and printed directly into the extruder

The issue gets worse the more surface area the print has. Things with little top layers come out fine. As you can see in the pictures, first layer looks good, but then 2nd and 3rd layer of solid infill look bad.

Perfect first layer. Issue starts on second layer

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20231218_1519301920×2560 364 KB

3rd layer of top infill

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20231218_1454451920×2560 360 KB

3rd layer of solid infill

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20231218_1433141920×2560 361 KB

Smaller passes seem okay (on the sides), but longer ones are terrible

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20231215_0710131920×2560 390 KB

2

What filament are you using and have you dried it?

5 Likes
3

Overture PLA. I have many rolls open, but I have a dehumidifier running 24/7 in that room. I am also in the midwest where it is getting very cold and dry.

I have 5 other Creality machines and all print flawlessly with the same filament.

4

Looks like its printing too fast for that filament, that’s maybe why small top areas look good.

2 Likes
5

I feel very silly for not considering this. I assumed the default profiles were calibrated perfectly for speed. I bumped both solid and top solid down to 175 (they were 250 and 200) and things are looking good on layer #2! This must have been it. I will slowly turn them back up to find the sweet spot for speed/quality.

I’ll post when the print finishes to confirm. Thanks

7

You can also try bumping up the nozzle temperature.

6 Likes
8

That seems to have fixed it! Thank you everyone for the quick help.

From here I will fine tune the speed and temp to get it going as fast as possible.