What problem is this?

JohanK

Hi,

I tried to print a lithophane globe, but it failed half way trough.
Does someone know what this problem is called? Then I'm sure someone already has a solution.

I have a Ender 3 V2. I used the following print settings in Cura 4.2.1:
Standard Quality 0.2mm
infill 100%
no support
Build Plate Adhesion Type: None

Thank you!

WayneP

The type of filament being used could be a factor; PLA has a melting temperature of ~180c (I use 185c) If you're using ABS the temperature needs to be at least 200c

Print Cooling is another option, I use 90% for PLA so that it doesn't cool the filament down too quickly and allows time for it to adhere to the previous layer.

There could be many reasons why its doing this, trial and error will be your best solution. I'd also recommend starting by printing a smaller version first

JohanK

@Kaelum Thank you for your reply!
Those strings already start when he is still printing pretty vertically. So maybe it is not just because it's a sphere?

telephasic

Probably somebody else knows, but in the meantime, maybe you try some of the checks/adjustments mentioned here
https://teachingtechyt.github.io/calibration.html

Should be able to narrow it down before spending the time on another of those globes.

Kaelum

The print angle near the top of the sphere is too high. All spherical objects have this issue. You need to use supports, which can be tricky. You are going to need to support the top ~1/3 of the sphere in some way.