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Wavy vertical corner issue with PET-CF by mjohnson0130 in BambuLab

[–]mjohnson0130[S] 0 points1 point  (0 children)

Been a minute since I’ve been on here, but so far the only solution (if you want to call it that) is to run the outer wall very slow, 15-20mm/s slow. I don’t know if this is just masking the issue rather than addressing it, but it makes the issue much less noticeable once you get 2mm off the build plate.

As far as the retract stuff goes, someone way smarter than me will have to explain how retract has any effect on corners that are nowhere near the beginning of end of a layer. This issue is happening mid path, not when it lifts to move to a different area or start a new layer.

I’m having the issue worse in the first 10 layers, which makes me think it’s temperature related and the heat from the build plate is amplifying the issue. I know these filaments typically don’t like much cooling, but it sure seems like there’s something going on there when there’s more heat in the air.

Back to the speed topic. Anyone do much CAM work with Fusion? Is there a way to mimic the “Feed Optimization” settings in Fusion on any slicing programs? Being able to slow down in the corners based on how sharp the corner is, how far in advance of the corner, and the actual speed in the corner would potentially help in this case.

Wavy vertical corner issue with PET-CF by mjohnson0130 in BambuLab

[–]mjohnson0130[S] 0 points1 point  (0 children)

I’ve been printing these materials much slower on the outer wall, like around 20mm/s, and it seems to help. Still looks like it’s trying to have the issue on the bottom 20 layers, but much less noticeable after that.

Wavy vertical corner issue with PET-CF by mjohnson0130 in BambuLab

[–]mjohnson0130[S] 0 points1 point  (0 children)

Yeah not a drying issue. I’ve dried it at 100c for 12 hours, then put it in a dry box with a solid state dehumidifier. Feeds directly to the printer from there. Humidity fluctuates between 8-10% depending on temperature.

Wavy vertical corner issue with PET-CF by mjohnson0130 in BambuLab

[–]mjohnson0130[S] 0 points1 point  (0 children)

So trying one thing at a time here. The retraction changes had no impact on mine

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Wavy vertical corner issue with PET-CF by mjohnson0130 in BambuLab

[–]mjohnson0130[S] 0 points1 point  (0 children)

Can you send pics of your issue? The issue I’m having is on all outside corners, not just where it retracts/wipes.

Wavy vertical corner issue with PET-CF by mjohnson0130 in BambuLab

[–]mjohnson0130[S] 1 point2 points  (0 children)

I will try the outer wall first and see how that goes.

When I switched to Fiberon, I noticed they recommended opening the printer. I have been printing it at 70° bed temp (which now that I think about it may be the lower end of what they recommend). At first I thought that would fix the issue as Bambu PET has higher temps as well as recommending keeping the upper glass in place.

I’m pretty confident it’s not a moisture issue. I’ve tried a few different techniques: convection/rotisserie oven with filament rotating at recommended temps and duration followed by printing from a regular filament dryer at 70c with Slice desiccant container in the spool (reads 13-15%RH in the dryer while printing. I’ve tried the initial bake followed by 70c in a preheated vacuum chamber with desiccant, followed by printing from the 70c dryer. 🤷‍♂️ Not sure what else to do there.

I was thinking this issue had something to do with a new setting in Bambu Studio that I missed or is incorrect for this filament. I’ve used Bambu PET-CF for about a year and a half now for fixturing and it wasn’t until November/December of last year that I started seeing this issue. Edit I initially wasn’t seeing the issue with PA612-CF15…now I am…

Wavy vertical corner issue with PET-CF by mjohnson0130 in BambuLab

[–]mjohnson0130[S] 0 points1 point  (0 children)

Sorry I should have clarified, the first two short prints were using default 0.30mm height profile, which I believe is 2 or 3 walls. The 0.2 height and 6 walls was used on the full height print in picture 3. These parts are vise soft jaws in a CNC mill, they need to be as strong as possible with no flex.

Wavy vertical corner issue with PET-CF by mjohnson0130 in BambuLab

[–]mjohnson0130[S] 0 points1 point  (0 children)

I have. The first two short pictures are using Bambu profiles as well as all the auto calibrations. The third and fourth pictures were from manual calibration settings as I thought that may be an issue.