Warping later in the print

I’ve been trying to print a cone shape and when the base is around 3.75 inches in diameter it all stays flat. When I scale up the size so the base is close to 5.25 inches in diameter it starts lifting up around the outside edge in some places. Will a brim keep that from happening?

What type of filament? What slicer software?

A Brim should help… try a 5mm (~10 perimeter). It should seal the first layer better. Increase the initial bed temp a few degrees and print a little hotter for the first few layers.

If using S3D, I like a 5-10mm ooze shield w/brim. The project stays clean, and the shield blocks air from hitting the first few layers. Brim holds the ooze shield to the bed. Keeps curved surfaces from shrinking also. A bit of a wasted filament, but worth it so that the project doesn’t warp 200 layers in…

I tried the brim but got the same result. The filament is Village Plastic PLA (translucent green)
The slicer software is the Cura Lulzbot edition. While I can customize the material to a hotter temp, I’m not sure how that is done for certain layers within that software.

I also tried lowering the z-axis again in case I am still not quite laying the filament close enough to the bed.

Are you sure the scaled up base is actually flat still? Can you post the stl?

This is the STL file. It was scaled up using Fusion 360.
I am using the built-in material selection in Cura Lulzbot edition for Village PLA plastic.
Lowering the z-axis didn’t seem to make any difference at all.

It seems like prints that are larger than maybe 3-4 inches in diameter tend to warp upwards. It doesn’t warp evenly either. Its like one opposite sides of the print.
LampConeHole.stl (754 KB)

This is a large image of the first few layers. I outlined where the plastic raised up.

I’ve seen a similar problem with some of my PLA prints. The 3DBenchy bow was particularly prone to rise above the height of the nozzle causing it to hit the print as it laid down the next layer. What was suggested that worked for me was more cooling. PLA loves cooling. I added a desk fan blowing across the print after the first couple of layers (see https://forum.lulzbot.com/t/taz-6-external-cooling-fan-s/5823/1).

Your part may require a fan on each side or one blowing from the front so the air splits around both sides evenly.

Base looks ok. Probably not enough cooling and or too hot a bed

Testing another run with a fan blowing across the bed. Hopefully I’ll see a difference.

Same issue. Fan made no difference. Is it possible the bed is defective and not heating evenly?

Possible that the bed heating is uneven. An infra-red thermometer should show that (I wonder if an instant read meat thermometer might work?). Try moving the print around on the bed (in your slicer) but before you do that, try the attached test print and see how it looks.
Bed_Levelling_squares.stl (19.4 KB)

Of course these look like they came out perfectly.

I tried again and moved the model to the front left side. I am attaching the results. It looks like it is messing up on the exact same location despite moving the model. Now I am suspicious that the model is suspect.

Remove the squares and compare the pattern on the bottom to check level of the bed. If the patterns are pretty consistent then the bed is level. A more pronounced extrusion pattern will show a problem with the autolevel, or that side of the bed is lower than other parts.

The patterns look consistent. I am reproducing the bottom ring in Fusion 360 and then printing the result. So far I am not seeing the weirdness I do in the original model. If that works then I may have to build the model myself.