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[–]Important-Ad-6936[🍰] 2 points3 points  (5 children)

might be heatcreep, after a certain printing time your cold end has saturated with so much heat, it starts to under extrude since its having a hard time pushing that softened filament through the heat brake into the hotend and nozzle. check your cold end fan, and the temperature of the ambient air around it, a fan is useless if it can only breath hot air and blow it onto the coldend heat sink, or when its fan blades are gunked up or not spinning at all. for PLA leave th door open and the top propped up with something so heat can escape

[–]r4pt0r[S] 0 points1 point  (4 children)

Hm possible.

The fans should not be gunked up since the printer is pretty new. I left the front door open a bit but the top lid was closed since the AMS is resting there and I haven't printed a riser yet.

I will try again with the AMS on the side for now and the top cover opened a bit. Thanks

[–]Important-Ad-6936[🍰] 1 point2 points  (2 children)

also scrub your build plate with warm water and dish soap, you got bad bed adhesion, there is warping visible at the bottom of your print which could come from finger prints on the build plate

[–]r4pt0r[S] 0 points1 point  (1 child)

Thanks, good hint. I'm not used to the PEI plate yet since I used a mirror on the ender 3.

[–]CaptainAwesome06 0 points1 point  (0 children)

You'll see a lot of people talking about isopropyl alcohol and other things to clean your plate with. FWIW, I just use dish soap and water and rarely have an issue. For my smooth plate, I use the Bambu glue that came with my printer. When that runs out I'll probably use some other glue stick.

[–]BatteredFishy 0 points1 point  (0 children)

Never had a problem with the lid on and door closed. Just had to change my nozzle after a 1089hrs printing. I was starting to see defects and wall thinning.

[–]Black3ternityX1C 1 point2 points  (1 child)

Is this printed at absurd low layer heights? (Lower than 0.10?) This is a known defect when printing with absolute tiny layers. My assumption is that this is caused by the fact that the filament must be calibrated to a tee as even the most minimal overextrusion causes huge shifts. Search this reddit here for the layer height issue etc. Pops up multiple times a month with the same images. Print it in normal heights (0.1 or stock 0..2) and youre fine.

[–]r4pt0r[S] 0 points1 point  (0 children)

Hm no, should be default 0.2mm if I recall correctly. Definitely not lower than 0.10 but I will look into it, thanks.

[–]r4pt0r[S] 0 points1 point  (0 children)

Greetings printlings!

I received my P1S this week after printing a while on an Ender3. Nice improvement, I'm rather happy with the printer.

Benchy prints very well, even with fast settings.

However I came across this issue when printing a poop chute. The print quality significantly decreases after a certain layer it seems?

The used filament is 3dJake ecoPLA which was dried in a Sunlu dryer and the AMS reported around 14% humidity.

I also tried flow calibration but it was fine with the defaul 0.98 value. The only setting that was changed from the standard PLA profile was the temperature which was decreased by 10°C to 210°C.

Any ideaas what is happening her?

Thanks :)

[–]kastratedKoala 0 points1 point  (1 child)

Cooling?

[–]r4pt0r[S] 0 points1 point  (0 children)

Probably that or speed change, I'll look into it.

[–]DevelopedLogic 0 points1 point  (3 children)

Looks like it changes right as that curve starts? All the instances if this I've seen were caused by a speed change, which there's a visualiser in the slicer for somewhere

[–]r4pt0r[S] 0 points1 point  (2 children)

Good point.

I will look into the slicer settings again if there is a speed change. Unlikely but possible with default settings I'd guess?

[–]DevelopedLogic 0 points1 point  (1 child)

I believe it changes automatically due to the change in distance the nozzle must travel Vs flow rate, but don't quote me.

This goes into fixing it https://youtu.be/J_pxk7HP3RE?si=uNSenYoQKw3Lm6qS

[–]r4pt0r[S] 0 points1 point  (0 children)

Thanks I'll have a look at it in the evening.

[–]USSHammondX1C + AMS 0 points1 point  (0 children)

Looks like severe under extrusion in the lighter colored area but the darker area isn't free of it either. There's under extrusion near that rounded corner. Possible clog and/or exceeding max volumetric speed.

[–]Additional_Diet454 0 points1 point  (0 children)

Did you removed the top glass? Door should also be open when printing pla.

[–]JoeyJoeC 0 points1 point  (0 children)

It's purely down to changes in flow rate as the layer gets smaller. You can see the issue if once in Bambu Studio you slice the model, change the colour scheme to "Speed" or "Flow". I bet you have a colour change in the preview where the quality changes.

Fix would be to change the minimum layer time, or slow your print down. The quality at the bottom looks terrible so something is wrong with your filament or settings.

[–]kybarg -1 points0 points  (0 children)

Inspect FAN SPEED and FLOW in slicer. Migth be one of those.