ripping/tearing of first few layers in one local spot on large print.

The first few layers ripped and teared in one local spot on a large print. What might have been the cause and what can be done to fix it?
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10 Replies
modern-teal
modern-teal9mo ago
The "waves" next to it would hint at a squished layer there. i guess it waved there too, but enough to catch on. check if the bed is planar at that spot first would be my first try.
gywilo
gywilo9mo ago
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gywilo
gywilo9mo ago
Second attempt showed some marks on initial layers but didn't continue tearing Wouldn't the bed mesh compensate though? Perhaps I need a finer bed mesh here?
modern-teal
modern-teal9mo ago
yeah, if its not probing that particular area, and also not with high density - which i doubt it does, that would do nothing since it interpolates...
gywilo
gywilo9mo ago
okay, so I've done two tests to confirm this is a not a bed mesh issue and instead something wrong with the surface itself. 1. I increased bed mesh density so that probeing occurs every 10mm, and still got same result. 2. I then went back to regular mesh density and rotated the bed surface 90° so that the problem area was in a different spot (back right instead back left) perhaps the surface has been contaminated in some way or the PEI coating was not applied correctly in this area? I will try cleaning with hot water and dish soap I cleaned the build surface and that resolved the issue, able to print clean first layer in that spot now
SYG|Krizalid87
SYG|Krizalid879mo ago
With isoprophilic or other special products?
gywilo
gywilo9mo ago
70% IPA then soap and warm water
SYG|Krizalid87
SYG|Krizalid879mo ago
soap for hands or for dishes?
gywilo
gywilo9mo ago
dish soap
SYG|Krizalid87
SYG|Krizalid879mo ago
Ty