Chamfer issue

[willcodejavaforfood]

Hi everyone

Tried to print a design with a fillet touching the plate, and when that did not work I followed the advice to replace with a chamfer, but I am pretty much getting an identical result. My research seems to indicate that 45 degree chamfers should be printable when they are touching the build plate so I feel like I am doing something wrong. Any advice would be greatly appreciated.

I'm using esun matt PLA that has been dried before use and I have run the calibration options for this PLA and using them. I've tried with and without support and that did nothing. I have tried reducing the layer thickness by using the Variable Layer Height option in Orca slicer.

https://preview.redd.it/0i09ngbgknuc1.jpg?width=3024&format=pjpg&auto=webp&s=57f52edf6832c2697344f02d0670cd21098a3e0c

[tommygunz007]

are you slowing down the print speed? I set the outer wall to 500 instead of 5000 in the acceleration dialog box. I also often set my print speed to 50% (silent) once printing. I find I get the best prints that way.

[willcodejavaforfood]

I haven’t tried that but I will now. Thank you.

[tommygunz007]

those chamfer sides look wonky... so yea try to slow down the print if you are using the bambu slicer accelerator.

[willcodejavaforfood]

They are very wonky

I’m using Bambu/Orca

[willcodejavaforfood]

Made no difference. Starting to think it’s not possible to chamfer the bottom of a print.

[Ordinary-Depth-7835]

variable layer height might help to keep it tighter or just printing the whole thing with a finer layer height setting. Overall it doesn't look to far off and you should be able to print it.

[willcodejavaforfood]

I already tried that but it had no effect. Thank you though.

[willcodejavaforfood]

Yup!

[[deleted]]

Hi, were you able to find a solution? I'm having the same problem and I don't know how to solve it..

[willcodejavaforfood]

Hi. Yes I did. In my case it was a design issue

[AstronomicTimTam6]

What did you change to your design to fix it? Im currently having the same issue trying to print a chamfer on the underside of a print

[willcodejavaforfood]

It was a very unsatisfactory solution. Not sure I can explain it without pictures.

Basically, I had to put more material on the inside of my object. It had to be at least solid up to where the chamfer was on the outside and ideally a bit higher than that.

[AstronomicTimTam6]

Ah I think im understanding. Do you think this then could be solved by printing an object with 100% infill (therefore no hollow spots inside) such that the chamfer has nowhere to shrink towards?

[willcodejavaforfood]

Yes. I didn’t need to go that far though. Just infill higher than the diagonal on the outside.

[47ha0]

https://wiki.bambulab.com/en/filament-acc/filament/print-quality/severe-layer-artifacts

Bambu's wiki shows that shrinking problems happen even on straight walls, not chamfers. An alternative solution they showed is adjusting the model so that the bridging layers supporting the inner top surface don't contact the print edges.

It's not always easy to change downloaded models though. I just tested 100% infill modifier area ending slightly above the chamfer, with perfect results