Corners Lifting on L-shaped Print
Any suggestions for fixing this print? This is my fifth attempt, and the corners keep lifting every time. I added the diagonal cross braces for extra adhesion and to stop possible stress caused by flexing about the corner. The footprint takes up most of the build area, so I don't have room for brim, at least not on the outside where it seemingly is needed most. As you can see I tried mouse ears at the corners but aren't getting the job done. I suppose I can try a larger patch of manual brim under the inside corners at least. But I would appreciate any other suggestions. Why does this model want to bow vertically so much?
Details: PLA, Smooth PEI sheet, cleaned several times. The problematic walls are 2mm thick. Nozzle is 230 C first layer, 215 C other layers. Bed is 62 C.
RE:
Long straight lines will contract when the filament cools down and this will lift up the corners. I would add some additional mouse ears on the inside of the corners, especially under the red circle in the middle. You can scale the diameter of the mouse ears to make them bigger and e.g. place three of them on the inside of the corner in the middle, to create something like a partial brim on the inside.
Those diagonals have no big counteracting effect on the warping, because the contraction forces go along the sides.
RE: Corners Lifting on L-shaped Print
I usually slap some Layerneer or Magigoo on the sheet if I see issues like this, and that usually takes care of it. Don't even bother with mouse ears anymore.
Recently I started using CryoGrip Glacier sheets on some of my printers. They hold on to PLA like there's no tomorrow.
Formerly known on this forum as @fuchsr -- https://foxrun3d.com/
RE: Corners Lifting on L-shaped Print
@FoxRun3D has the right idea. Change your build plate or add some glue in the corners.
Can also try a brim if there is enough space for one. Otherwise, extra mouse ears.
RE: Corners Lifting on L-shaped Print
Thanks for the suggestions. Manual brim in the form of rounded rectangles at all three corners helped, and I ordered some Bed Weld and tried one print with that. The results I got were good enough for what I wanted to accomplish with this project right now, but in every case I still saw at least one corner slip a little and the walls bowing out slightly at the top of the print.